{"name":"The Agent Economy protocol compatibility","description":"Layer, settlement, composition, license, governance, and status for protocols and payment rails in the directory. Not documented means the checked page does not state the fact. Rows are alphabetical by listing name.","license":"CC BY 4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","dateModified":"2026-10-21","attribution":"The Agent Economy protocol compatibility (https://theagenteconomy.si/data/protocol-compatibility.json), licensed under CC BY 4.0.","distribution":"https://theagenteconomy.si/data/protocol-compatibility.json","order":"alphabetical by listing name","legend":{"Not documented":"The linked page was read on the as of date and does not state that fact. The note says what was checked."},"layers":[{"id":"tool-access","label":"Tool access"},{"id":"agent-messaging","label":"Agent to agent messaging"},{"id":"checkout","label":"Checkout and commerce"},{"id":"settlement","label":"Payment settlement"},{"id":"identity","label":"Identity and auth"}],"updated":"2026-10-21","rows":[{"slug":"a2a","name":"A2A","listing_url":"https://theagenteconomy.si/listings/a2a","compare":[{"title":"A2A vs AGNTCY","url":"https://theagenteconomy.si/compare/a2a-vs-agntcy"},{"title":"A2A vs Agent Network Protocol","url":"https://theagenteconomy.si/compare/a2a-vs-anp"},{"title":"A2A vs Model Context Protocol","url":"https://theagenteconomy.si/compare/a2a-vs-mcp"}],"layers":[{"text":"Agent to agent messaging. The project site says A2A is how independent agents discover each other, delegate tasks, and share results.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21","layer":"agent-messaging"}],"settlement":[{"text":"Not documented","note":"The project site read on 2026-10-21 does not name a settlement asset.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21"}],"composes":[{"text":"The project site says MCP connects an agent to tools and A2A connects agents to other agents, and that the two are meant to be used together.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21"},{"text":"AP2's site says the protocol is available as an extension for A2A and for the Universal Commerce Protocol.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"},{"text":"The UCP specification defines an A2A transport whose endpoint is an Agent Card URL.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"},{"text":"The A2A x402 extension v0.2 spec defines on-chain payments for A2A, including an embedded flow that nests x402 data inside an AP2 mandate.","source_url":"https://github.com/google-agentic-commerce/a2a-x402/blob/main/spec/v0.2/spec.md","source_title":"A2A x402 payments extension v0.2","as_of":"2026-10-21"},{"text":"The PACT overview says the protocol sits on A2A 1.0.","source_url":"https://openpactprotocol.org/","source_title":"PACT protocol overview","as_of":"2026-10-16"},{"text":"ERC-8004 names A2A as an agent communication protocol and allows a registration file to list an A2A endpoint.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}],"governance":[{"text":"The project site says A2A was developed by Google, donated to the Linux Foundation, and is maintained by a Technical Steering Committee.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21"}],"license":[{"text":"Apache-2.0.","note":"The same page states the Apache License 2.0. The GitHub license API also reported Apache-2.0 for a2aproject/A2A on 2026-10-21.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21"}],"status":[{"text":"Live. The project site presents A2A as a published open standard.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21"}]},{"slug":"anp","name":"Agent Network Protocol","listing_url":"https://theagenteconomy.si/listings/anp","compare":[{"title":"A2A vs Agent Network Protocol","url":"https://theagenteconomy.si/compare/a2a-vs-anp"}],"layers":[{"text":"Identity and auth. The README marks DID authentication, the did:wba method, and discovery as released v1.2.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21","layer":"identity"},{"text":"Agent to agent messaging. The README includes a messaging profile in the 1.2 set. Group end to end encryption remains a candidate.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21","layer":"agent-messaging"}],"settlement":[{"text":"Not documented","note":"ANP-10 is listed as an AP2 payment adaptation draft and is not a released settlement rail. No current asset is named.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21"}],"composes":[{"text":"The README lists ANP-10 as an AP2 payment adaptation draft, marked draft and not released.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21"}],"governance":[{"text":"License notices on the README identify ANP Community. No separate standards body is named there.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21"}],"license":[{"text":"Apache-2.0. The README points at the repository LICENSE file.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21"}],"status":[{"text":"Spec set 1.2 is released for the core identity and discovery documents. Authorization, the meta-protocol, and the payment adaptation are marked draft.","source_url":"https://github.com/agent-network-protocol/AgentNetworkProtocol/blob/HEAD/README.md","source_title":"ANP specification index","as_of":"2026-10-21"}]},{"slug":"agent-vault","name":"Agent Vault","listing_url":"https://theagenteconomy.si/listings/agent-vault","compare":[],"layers":[{"text":"Checkout and commerce. A proxy checks the account holder's rules, then types the real value into the merchant page.","source_url":"https://docs.agentvault.io/get-started/how-it-works","source_title":"How Agent Vault checkout works","as_of":"2026-10-20","layer":"checkout"},{"text":"Identity and auth. The product gives an agent mock card and login tokens. The agent does not hold the card number.","source_url":"https://docs.agentvault.io/","source_title":"What is Agent Vault","as_of":"2026-10-20","layer":"identity"}],"settlement":[{"text":"Card. The checked pages describe a mock card and a real card value typed into the merchant page.","source_url":"https://docs.agentvault.io/get-started/how-it-works","source_title":"How Agent Vault checkout works","as_of":"2026-10-20"}],"composes":[{"text":"Not documented","note":"The checked Agent Vault pages do not name another protocol in this directory.","source_url":"https://docs.agentvault.io/","source_title":"What is Agent Vault","as_of":"2026-10-20"}],"governance":[{"text":"Self Labs publishes the product.","source_url":"https://docs.agentvault.io/","source_title":"What is Agent Vault","as_of":"2026-10-20"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The checked page does not name a license.","source_url":"https://docs.agentvault.io/","source_title":"What is Agent Vault","as_of":"2026-10-20"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when those pages were checked.","source_url":"https://docs.agentvault.io/","source_title":"What is Agent Vault","as_of":"2026-10-20"}]},{"slug":"agentic-commerce-protocol","name":"Agentic Commerce Protocol","listing_url":"https://theagenteconomy.si/listings/agentic-commerce-protocol","compare":[{"title":"Agentic Commerce Protocol vs Universal Commerce Protocol","url":"https://theagenteconomy.si/compare/agentic-commerce-protocol-vs-ucp"}],"layers":[{"text":"Checkout and commerce. Stripe's documentation says ACP defines checkout sessions, cart and feed, delegated payment, orders, and webhooks.","source_url":"https://docs.stripe.com/agentic-commerce/protocols/acp","source_title":"Stripe documentation for the Agentic Commerce Protocol","as_of":"2026-10-21","layer":"checkout"},{"text":"Identity and auth. The same page says delegated authentication uses OAuth 2.0 so an agent can act for a buyer with a business.","source_url":"https://docs.stripe.com/agentic-commerce/protocols/acp","source_title":"Stripe documentation for the Agentic Commerce Protocol","as_of":"2026-10-21","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The page describes delegated payment tokens and does not fix one settlement asset. The getting started guide says payment flows to the merchant.","source_url":"https://docs.stripe.com/agentic-commerce/protocols/acp","source_title":"Stripe documentation for the Agentic Commerce Protocol","as_of":"2026-10-21"}],"composes":[{"text":"Not documented","note":"The repository README and the Stripe ACP page checked on 2026-10-21 do not say ACP implements UCP, MCP, A2A, AP2, or x402.","source_url":"https://github.com/agentic-commerce-protocol/agentic-commerce-protocol","source_title":"Agentic Commerce Protocol repository","as_of":"2026-10-21"}],"governance":[{"text":"The repository says OpenAI and Stripe are the founding maintainers.","source_url":"https://github.com/agentic-commerce-protocol/agentic-commerce-protocol","source_title":"Agentic Commerce Protocol repository","as_of":"2026-10-21"},{"text":"Stripe's documentation says the protocol was created by Stripe, OpenAI, and Meta.","source_url":"https://docs.stripe.com/agentic-commerce/protocols/acp","source_title":"Stripe documentation for the Agentic Commerce Protocol","as_of":"2026-10-21"}],"license":[{"text":"Apache-2.0.","note":"The repository README states the Apache 2.0 License. The GitHub license API reported Apache-2.0 on 2026-10-21.","source_url":"https://github.com/agentic-commerce-protocol/agentic-commerce-protocol","source_title":"Agentic Commerce Protocol repository","as_of":"2026-10-21"}],"status":[{"text":"Beta. The repository README says the specification is currently in beta.","source_url":"https://github.com/agentic-commerce-protocol/agentic-commerce-protocol","source_title":"Agentic Commerce Protocol repository","as_of":"2026-10-21"}]},{"slug":"agntcy","name":"AGNTCY","listing_url":"https://theagenteconomy.si/listings/agntcy","compare":[{"title":"A2A vs AGNTCY","url":"https://theagenteconomy.si/compare/a2a-vs-agntcy"}],"layers":[{"text":"Identity and auth. The project is described as an open stack for cross vendor agent discovery and identity.","source_url":"https://agntcy.org/","source_title":"AGNTCY project site","as_of":"2026-10-20","layer":"identity"},{"text":"Agent to agent messaging. The same description includes messaging and observability.","source_url":"https://agntcy.org/","source_title":"AGNTCY project site","as_of":"2026-10-20","layer":"agent-messaging"}],"settlement":[{"text":"Not documented","note":"The project description checked for the listing does not name a settlement asset.","source_url":"https://agntcy.org/","source_title":"AGNTCY project site","as_of":"2026-10-20"}],"composes":[{"text":"Not documented","note":"The Linux Foundation welcome and the project site used for the listing do not name another protocol in this directory.","source_url":"https://www.linuxfoundation.org/press/linux-foundation-welcomes-the-agntcy-project-to-standardize-open-multi-agent-system-infrastructure-and-break-down-ai-agent-silos","source_title":"Linux Foundation welcome of the AGNTCY project","as_of":"2026-10-20"}],"governance":[{"text":"The Linux Foundation welcomed the project.","source_url":"https://www.linuxfoundation.org/press/linux-foundation-welcomes-the-agntcy-project-to-standardize-open-multi-agent-system-infrastructure-and-break-down-ai-agent-silos","source_title":"Linux Foundation welcome of the AGNTCY project","as_of":"2026-10-20"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/agntcy/dir","source_title":"GitHub repository agntcy/dir","as_of":"2026-10-21"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the project site was checked.","source_url":"https://agntcy.org/","source_title":"AGNTCY project site","as_of":"2026-10-20"}]},{"slug":"ap2","name":"AP2","listing_url":"https://theagenteconomy.si/listings/ap2","compare":[{"title":"AP2 vs Machine Payments Protocol","url":"https://theagenteconomy.si/compare/ap2-vs-mpp"}],"layers":[{"text":"Checkout and commerce. A checkout mandate captures the cart negotiated between an agent and a merchant.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21","layer":"checkout"},{"text":"Payment settlement. A payment mandate authorizes payment against a payment instrument.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21","layer":"settlement"}],"settlement":[{"text":"Credit and debit cards in the initial version. The page calls these common pull payment methods.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"},{"text":"Not documented","note":"Stablecoin, Lightning, and bank are not named as current rails. The same page puts real time bank transfers and digital currencies on a roadmap.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"}],"composes":[{"text":"The site says AP2 is an extension for A2A and for the Universal Commerce Protocol.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"},{"text":"The same page also calls AP2 an open extension for A2A and MCP.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"},{"text":"The site links a human not present sample that uses x402.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"},{"text":"The A2A x402 extension v0.2 spec describes an embedded flow that places x402 payment data inside an AP2 cart mandate and payment mandate.","source_url":"https://github.com/google-agentic-commerce/a2a-x402/blob/main/spec/v0.2/spec.md","source_title":"A2A x402 payments extension v0.2","as_of":"2026-10-21"}],"governance":[{"text":"The site says standardization continues in the FIDO Alliance Agentic Authentication and Payments technical working groups. The public repository hosts the current specification.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/google-agentic-commerce/AP2","source_title":"GitHub repository google-agentic-commerce/AP2","as_of":"2026-10-21"}],"status":[{"text":"Directory status: beta. The site documents public samples and says FIDO continues the standards work.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"}]},{"slug":"coinbase-agentic-wallet","name":"Coinbase Agentic Wallet","listing_url":"https://theagenteconomy.si/listings/coinbase-agentic-wallet","compare":[],"layers":[{"text":"Payment settlement. The documentation describes a wallet the agent uses to hold USDC, send, trade, and pay for services.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Stablecoin. The listing source says the agent holds USDC.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19"}],"composes":[{"text":"The listing source says the agent pays x402 services.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19"},{"text":"The same source says the MCP version is labeled beta.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19"}],"governance":[{"text":"Coinbase Developer Platform publishes the wallet.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The checked page does not name a license.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19"}],"status":[{"text":"Directory status: live. The listing source says the MCP version is labeled beta.","source_url":"https://docs.cdp.coinbase.com/agentic-wallet/welcome","source_title":"Coinbase Agentic Wallet documentation overview","as_of":"2026-10-19"}]},{"slug":"erc-8004","name":"ERC-8004","listing_url":"https://theagenteconomy.si/listings/erc-8004","compare":[{"title":"Microsoft Entra Agent ID vs ERC-8004","url":"https://theagenteconomy.si/compare/entra-agent-id-vs-erc-8004"}],"layers":[{"text":"Identity and auth. The EIP specifies an ERC-721 identity registry, a reputation registry, and a validation registry.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The EIP says payments are orthogonal to this protocol and are not covered. It does not name a settlement asset.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}],"composes":[{"text":"The motivation names MCP for tools and A2A for agent messaging, and says those protocols do not cover discovery and trust.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"},{"text":"A registration file may list A2A and MCP endpoints.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"},{"text":"The EIP says examples show how x402 payments can enrich feedback signals. Payments are not part of the protocol.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}],"governance":[{"text":"Ethereum Improvement Proposal. The page lists the authors and the discussion thread.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}],"license":[{"text":"CC0. The EIP says copyright and related rights are waived via CC0.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}],"status":[{"text":"Draft. The EIP page labels the proposal Draft.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}]},{"slug":"hedera-agent-accounts","name":"Hedera Agent Accounts","listing_url":"https://theagenteconomy.si/listings/hedera-agent-accounts","compare":[],"layers":[{"text":"Payment settlement. The announcement describes an owner funded spending account with a daily cap, a per transaction maximum, and a recipient allowlist.","source_url":"https://hedera.com/blog/introducing-hedera-agent-accounts/","source_title":"Introducing Hedera Agent Accounts","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Not documented","note":"The announcement does not name stablecoin, card, Lightning, or bank as the settlement asset.","source_url":"https://hedera.com/blog/introducing-hedera-agent-accounts/","source_title":"Introducing Hedera Agent Accounts","as_of":"2026-10-19"}],"composes":[{"text":"Not documented","note":"The announcement does not name another protocol in this directory.","source_url":"https://hedera.com/blog/introducing-hedera-agent-accounts/","source_title":"Introducing Hedera Agent Accounts","as_of":"2026-10-19"}],"governance":[{"text":"Hedera publishes the announcement.","source_url":"https://hedera.com/blog/introducing-hedera-agent-accounts/","source_title":"Introducing Hedera Agent Accounts","as_of":"2026-10-19"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The announcement does not name a license.","source_url":"https://hedera.com/blog/introducing-hedera-agent-accounts/","source_title":"Introducing Hedera Agent Accounts","as_of":"2026-10-19"}],"status":[{"text":"Spec. The announcement says public testnet access is still forthcoming.","source_url":"https://hedera.com/blog/introducing-hedera-agent-accounts/","source_title":"Introducing Hedera Agent Accounts","as_of":"2026-10-19"}]},{"slug":"l402","name":"L402","listing_url":"https://theagenteconomy.si/listings/l402","compare":[{"title":"L402 vs x402","url":"https://theagenteconomy.si/compare/l402-vs-x402"}],"layers":[{"text":"Payment settlement. The server answers HTTP 402 with a token bound to a Lightning invoice. The client pays, then presents the preimage.","source_url":"https://docs.lightning.engineering/the-lightning-network/l402","source_title":"Lightning Labs L402 documentation","as_of":"2026-10-21","layer":"settlement"}],"settlement":[{"text":"Lightning. The token commits to a Lightning invoice by its payment hash.","source_url":"https://docs.lightning.engineering/the-lightning-network/l402","source_title":"Lightning Labs L402 documentation","as_of":"2026-10-21"}],"composes":[{"text":"Not documented","note":"The L402 page read on 2026-10-21 does not name x402, MPP, AP2, or another protocol in this directory.","source_url":"https://docs.lightning.engineering/the-lightning-network/l402","source_title":"Lightning Labs L402 documentation","as_of":"2026-10-21"}],"governance":[{"text":"Lightning Labs publishes the L402 documentation. Aperture is described there as an implementation.","source_url":"https://docs.lightning.engineering/the-lightning-network/l402","source_title":"Lightning Labs L402 documentation","as_of":"2026-10-21"}],"license":[{"text":"Not documented","note":"The L402 documentation page does not state a license for the protocol text.","source_url":"https://docs.lightning.engineering/the-lightning-network/l402","source_title":"Lightning Labs L402 documentation","as_of":"2026-10-21"},{"text":"MIT for the Aperture repository, which the L402 page calls an implementation.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/lightninglabs/aperture","source_title":"GitHub repository lightninglabs/aperture","as_of":"2026-10-21"}],"status":[{"text":"Live. The documentation presents L402 as the current standard for this HTTP 402 flow.","source_url":"https://docs.lightning.engineering/the-lightning-network/l402","source_title":"Lightning Labs L402 documentation","as_of":"2026-10-21"}]},{"slug":"mpp","name":"Machine Payments Protocol","listing_url":"https://theagenteconomy.si/listings/mpp","compare":[{"title":"AP2 vs Machine Payments Protocol","url":"https://theagenteconomy.si/compare/ap2-vs-mpp"},{"title":"Machine Payments Protocol vs x402","url":"https://theagenteconomy.si/compare/mpp-vs-x402"}],"layers":[{"text":"Payment settlement. The MPP site calls it an open standard for machine to machine payments via HTTP 402.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21","layer":"settlement"}],"settlement":[{"text":"The MPP documentation index describes stablecoin, card, and Lightning Bitcoin payment methods.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21"},{"text":"Stripe's documentation describes authorization with a card or a stablecoin.","source_url":"https://docs.stripe.com/payments/machine/mpp","source_title":"Stripe documentation for MPP","as_of":"2026-10-16"}],"composes":[{"text":"The MPP documentation index includes a guide for using MPP with x402.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21"},{"text":"The same index describes an MCP and JSON-RPC transport for MPP challenges.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21"}],"governance":[{"text":"Stripe's documentation describes MPP as co-authored by Stripe and Tempo.","source_url":"https://docs.stripe.com/payments/machine/mpp","source_title":"Stripe documentation for MPP","as_of":"2026-10-16"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/tempoxyz/mpp","source_title":"GitHub repository tempoxyz/mpp","as_of":"2026-10-21"}],"status":[{"text":"Live. The MPP site presents the protocol as an open standard.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21"}]},{"slug":"mastercard-agent-pay","name":"Mastercard Agent Pay for Machines","listing_url":"https://theagenteconomy.si/listings/mastercard-agent-pay","compare":[],"layers":[{"text":"Payment settlement. The 2026-10-20 article says an agent signs a payment voucher after an HTTP 402 response, inside a spending limit.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21","layer":"settlement"}],"settlement":[{"text":"The article says settlement in the demonstration can be fiat or stablecoins, and that on-chain settlement uses Base. Vouchers can be redeemed later.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21"}],"composes":[{"text":"The article says Agent Pay for Machines builds on x402.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21"}],"governance":[{"text":"Mastercard publishes the protocol.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21"}],"license":[{"text":"Not documented","note":"The article does not name a license. The listing has no public repository.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21"}],"status":[{"text":"Beta. The article dated 2026-10-20 announces Early Access after pilots.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21"}]},{"slug":"metamask-agent-wallet","name":"MetaMask Agent Wallet","listing_url":"https://theagenteconomy.si/listings/metamask-agent-wallet","compare":[],"layers":[{"text":"Payment settlement. The documentation describes a wallet CLI for sending tokens and paying requests.","source_url":"https://docs.metamask.io/agent-wallet/reference/trading-modes/","source_title":"MetaMask Agent Wallet trading modes","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Not documented","note":"The checked page says the wallet sends tokens. It does not name stablecoin, card, Lightning, or bank.","source_url":"https://docs.metamask.io/agent-wallet/reference/trading-modes/","source_title":"MetaMask Agent Wallet trading modes","as_of":"2026-10-19"}],"composes":[{"text":"The listing source says the CLI pays x402 requests.","source_url":"https://docs.metamask.io/agent-wallet/reference/trading-modes/","source_title":"MetaMask Agent Wallet trading modes","as_of":"2026-10-19"}],"governance":[{"text":"MetaMask publishes the documentation.","source_url":"https://docs.metamask.io/agent-wallet/reference/trading-modes/","source_title":"MetaMask Agent Wallet trading modes","as_of":"2026-10-19"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The checked page does not name a license.","source_url":"https://docs.metamask.io/agent-wallet/reference/trading-modes/","source_title":"MetaMask Agent Wallet trading modes","as_of":"2026-10-19"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the page was checked.","source_url":"https://docs.metamask.io/agent-wallet/reference/trading-modes/","source_title":"MetaMask Agent Wallet trading modes","as_of":"2026-10-19"}]},{"slug":"mcp","name":"Model Context Protocol","listing_url":"https://theagenteconomy.si/listings/mcp","compare":[{"title":"A2A vs Model Context Protocol","url":"https://theagenteconomy.si/compare/a2a-vs-mcp"}],"layers":[{"text":"Tool access. The specification says servers can offer resources, prompts, and tools to a client.","source_url":"https://modelcontextprotocol.io/specification/2026-07-28","source_title":"Model Context Protocol specification","as_of":"2026-10-21","layer":"tool-access"}],"settlement":[{"text":"Not documented","note":"The specification read on 2026-10-21 does not name a settlement asset.","source_url":"https://modelcontextprotocol.io/specification/2026-07-28","source_title":"Model Context Protocol specification","as_of":"2026-10-21"}],"composes":[{"text":"The A2A project site says MCP is the tool interface and A2A is the agent to agent interface.","source_url":"https://a2a-protocol.org/latest/","source_title":"A2A protocol site","as_of":"2026-10-21"},{"text":"The UCP specification defines an MCP transport.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"},{"text":"The Personal Agent Protocol draft says a company publishes how an agent may act using OAuth, OpenAPI, and MCP.","source_url":"https://personalagentprotocol.org/docs/0.2/spec","source_title":"Personal Agent Protocol draft specification","as_of":"2026-10-16"},{"text":"ERC-8004 names MCP and allows a registration file to list an MCP endpoint.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"},{"text":"The MPP documentation index describes an MCP transport for payment challenges.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21"},{"text":"AP2's site calls AP2 an open extension for A2A and MCP.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"}],"governance":[{"text":"GOVERNANCE.md says Model Context Protocol is a series of LF Projects, LLC.","source_url":"https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/GOVERNANCE.md","source_title":"Model Context Protocol governance","as_of":"2026-10-21"}],"license":[{"text":"New code and specifications are Apache-2.0. Documentation other than specifications is CC-BY-4.0. Some earlier contributions remain under MIT until the author agrees to relicense.","source_url":"https://github.com/modelcontextprotocol/modelcontextprotocol/blob/main/LICENSE","source_title":"Model Context Protocol LICENSE","as_of":"2026-10-21"}],"status":[{"text":"Live. The specification dated 2026-07-28 is the published specification linked from the project.","source_url":"https://modelcontextprotocol.io/specification/2026-07-28","source_title":"Model Context Protocol specification","as_of":"2026-10-21"}]},{"slug":"nevermined","name":"Nevermined","listing_url":"https://theagenteconomy.si/listings/nevermined","compare":[],"layers":[{"text":"Payment settlement. The documentation describes a facilitator that verifies and settles charges against a payment plan.","source_url":"https://nevermined.ai/docs/products/payments-facilitator/overview","source_title":"Nevermined payments facilitator","as_of":"2026-10-21","layer":"settlement"}],"settlement":[{"text":"Card, through delegated card spending. The page also says it settles x402 and MPP charges and does not name the asset inside those charges.","source_url":"https://nevermined.ai/docs/products/payments-facilitator/overview","source_title":"Nevermined payments facilitator","as_of":"2026-10-21"}],"composes":[{"text":"The page says the facilitator verifies and settles x402 and MPP charges.","source_url":"https://nevermined.ai/docs/products/payments-facilitator/overview","source_title":"Nevermined payments facilitator","as_of":"2026-10-21"}],"governance":[{"text":"Nevermined publishes the facilitator.","source_url":"https://nevermined.ai/docs/products/payments-facilitator/overview","source_title":"Nevermined payments facilitator","as_of":"2026-10-21"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The checked page does not name a license.","source_url":"https://nevermined.ai/docs/products/payments-facilitator/overview","source_title":"Nevermined payments facilitator","as_of":"2026-10-21"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the page was checked.","source_url":"https://nevermined.ai/docs/products/payments-facilitator/overview","source_title":"Nevermined payments facilitator","as_of":"2026-10-21"}]},{"slug":"pact","name":"PACT","listing_url":"https://theagenteconomy.si/listings/pact","compare":[{"title":"PACT vs Personal Agent Protocol","url":"https://theagenteconomy.si/compare/pact-vs-personal-agent-protocol"}],"layers":[{"text":"Identity and auth. A personal agent signs requests and acts for a user only inside scopes that user approved with a brand.","source_url":"https://openpactprotocol.org/","source_title":"PACT protocol overview","as_of":"2026-10-16","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The overview used for the listing does not name a settlement asset.","source_url":"https://openpactprotocol.org/","source_title":"PACT protocol overview","as_of":"2026-10-16"}],"composes":[{"text":"The overview says the protocol sits on A2A 1.0.","source_url":"https://openpactprotocol.org/","source_title":"PACT protocol overview","as_of":"2026-10-16"}],"governance":[{"text":"Not documented","note":"The overview used for the listing does not name a standards body.","source_url":"https://openpactprotocol.org/","source_title":"PACT protocol overview","as_of":"2026-10-16"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/openpactprotocol/openpactprotocol","source_title":"GitHub repository openpactprotocol/openpactprotocol","as_of":"2026-10-21"}],"status":[{"text":"Directory status: beta.","note":"The directory classified the listing as beta when the overview was checked.","source_url":"https://openpactprotocol.org/","source_title":"PACT protocol overview","as_of":"2026-10-16"}]},{"slug":"personal-agent-protocol","name":"Personal Agent Protocol","listing_url":"https://theagenteconomy.si/listings/personal-agent-protocol","compare":[{"title":"PACT vs Personal Agent Protocol","url":"https://theagenteconomy.si/compare/pact-vs-personal-agent-protocol"}],"layers":[{"text":"Identity and auth. The draft describes how a company publishes the way a personal agent may sign in and act on a person's account.","source_url":"https://personalagentprotocol.org/docs/0.2/spec","source_title":"Personal Agent Protocol draft specification","as_of":"2026-10-16","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The draft used for the listing does not name a settlement asset.","source_url":"https://personalagentprotocol.org/docs/0.2/spec","source_title":"Personal Agent Protocol draft specification","as_of":"2026-10-16"}],"composes":[{"text":"The draft uses OAuth, OpenAPI, and MCP.","source_url":"https://personalagentprotocol.org/docs/introduction","source_title":"Personal Agent Protocol overview","as_of":"2026-10-16"}],"governance":[{"text":"Not documented","note":"The draft used for the listing does not name a standards body.","source_url":"https://personalagentprotocol.org/docs/0.2/spec","source_title":"Personal Agent Protocol draft specification","as_of":"2026-10-16"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/personal-agent-protocol/personal-agent-protocol","source_title":"GitHub repository personal-agent-protocol/personal-agent-protocol","as_of":"2026-10-21"}],"status":[{"text":"Spec. The linked document is a draft specification at version 0.2. Directory status: designed.","source_url":"https://personalagentprotocol.org/docs/0.2/spec","source_title":"Personal Agent Protocol draft specification","as_of":"2026-10-16"}]},{"slug":"polygon-agent-cli","name":"Polygon Agent CLI","listing_url":"https://theagenteconomy.si/listings/polygon-agent-cli","compare":[],"layers":[{"text":"Payment settlement. The CLI reference describes an embedded smart wallet and session spending inside an owner approved allowance.","source_url":"https://agentconnect.polygon.technology/references/cli-reference.md","source_title":"Polygon Agent CLI reference","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Not documented","note":"The reference describes an allowance and per call caps. It does not name stablecoin, card, Lightning, or bank.","source_url":"https://agentconnect.polygon.technology/references/cli-reference.md","source_title":"Polygon Agent CLI reference","as_of":"2026-10-19"}],"composes":[{"text":"The listing source says x402 payments can be capped per call.","source_url":"https://agentconnect.polygon.technology/references/cli-reference.md","source_title":"Polygon Agent CLI reference","as_of":"2026-10-19"}],"governance":[{"text":"Polygon publishes the CLI reference.","source_url":"https://agentconnect.polygon.technology/references/cli-reference.md","source_title":"Polygon Agent CLI reference","as_of":"2026-10-19"}],"license":[{"text":"MIT.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/0xPolygon/polygon-agent-cli","source_title":"GitHub repository 0xPolygon/polygon-agent-cli","as_of":"2026-10-21"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the reference was checked.","source_url":"https://agentconnect.polygon.technology/references/cli-reference.md","source_title":"Polygon Agent CLI reference","as_of":"2026-10-19"}]},{"slug":"skyfire","name":"Skyfire","listing_url":"https://theagenteconomy.si/listings/skyfire","compare":[{"title":"Skyfire vs Tempo Wallet","url":"https://theagenteconomy.si/compare/skyfire-vs-tempo-wallet"}],"layers":[{"text":"Identity and auth. KYAPay tokens bind an agent identity to a payment the buyer has committed.","source_url":"https://docs.skyfire.xyz/docs/kyapay-tokens","source_title":"Skyfire KYAPay token documentation","as_of":"2026-10-16","layer":"identity"},{"text":"Payment settlement. The seller charges the committed payment after delivery.","source_url":"https://docs.skyfire.xyz/docs/payments-settlement","source_title":"Skyfire payments and settlement","as_of":"2026-10-16","layer":"settlement"}],"settlement":[{"text":"Not documented","note":"The listing summary of the settlement page does not name stablecoin, card, Lightning, or bank.","source_url":"https://docs.skyfire.xyz/docs/payments-settlement","source_title":"Skyfire payments and settlement","as_of":"2026-10-16"}],"composes":[{"text":"Not documented","note":"The checked Skyfire pages do not name another protocol in this directory.","source_url":"https://docs.skyfire.xyz/docs/kyapay-tokens","source_title":"Skyfire KYAPay token documentation","as_of":"2026-10-16"}],"governance":[{"text":"Skyfire publishes the documentation.","source_url":"https://docs.skyfire.xyz/docs/kyapay-tokens","source_title":"Skyfire KYAPay token documentation","as_of":"2026-10-16"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The checked page does not name a license.","source_url":"https://docs.skyfire.xyz/docs/kyapay-tokens","source_title":"Skyfire KYAPay token documentation","as_of":"2026-10-16"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the page was checked.","source_url":"https://docs.skyfire.xyz/docs/kyapay-tokens","source_title":"Skyfire KYAPay token documentation","as_of":"2026-10-16"}]},{"slug":"stripe-link-cli","name":"Stripe link-cli","listing_url":"https://theagenteconomy.si/listings/stripe-link-cli","compare":[],"layers":[{"text":"Checkout and commerce. The documentation describes an agent requesting a card purchase.","source_url":"https://docs.stripe.com/agentic-commerce/agents/link-agent-wallet/use-link-wallet-pay-online","source_title":"Enable agents to spend","as_of":"2026-10-19","layer":"checkout"},{"text":"Payment settlement. Link asks the customer to approve the spend, then returns a one time payment credential.","source_url":"https://docs.stripe.com/agentic-commerce/agents/link-agent-wallet/use-link-wallet-pay-online","source_title":"Enable agents to spend","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Card. The listing source also says the CLI can request a Machine Payments Protocol charge.","source_url":"https://github.com/stripe/link-cli/blob/main/README.md","source_title":"stripe/link-cli README","as_of":"2026-10-19"}],"composes":[{"text":"The README says the CLI can request a Machine Payments Protocol charge.","source_url":"https://github.com/stripe/link-cli/blob/main/README.md","source_title":"stripe/link-cli README","as_of":"2026-10-19"}],"governance":[{"text":"Stripe publishes the CLI.","source_url":"https://github.com/stripe/link-cli/blob/main/README.md","source_title":"stripe/link-cli README","as_of":"2026-10-19"}],"license":[{"text":"MIT.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/stripe/link-cli","source_title":"GitHub repository stripe/link-cli","as_of":"2026-10-21"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the README was checked.","source_url":"https://github.com/stripe/link-cli/blob/main/README.md","source_title":"stripe/link-cli README","as_of":"2026-10-19"}]},{"slug":"sui-agentic-payments","name":"Sui Agentic Payments","listing_url":"https://theagenteconomy.si/listings/sui-agentic-payments","compare":[],"layers":[{"text":"Payment settlement. The page describes a testnet gateway where an agent pays per API call.","source_url":"https://www.sui.io/agentpayments","source_title":"Sui Agent Payments","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Stablecoin. The page says payment is in USDC on Sui.","source_url":"https://www.sui.io/agentpayments","source_title":"Sui Agent Payments","as_of":"2026-10-19"}],"composes":[{"text":"Not documented","note":"The page does not name x402, MPP, or another protocol in this directory.","source_url":"https://www.sui.io/agentpayments","source_title":"Sui Agent Payments","as_of":"2026-10-19"}],"governance":[{"text":"Sui publishes the page.","source_url":"https://www.sui.io/agentpayments","source_title":"Sui Agent Payments","as_of":"2026-10-19"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The page does not name a license.","source_url":"https://www.sui.io/agentpayments","source_title":"Sui Agent Payments","as_of":"2026-10-19"}],"status":[{"text":"Beta. The page describes a testnet gateway. Directory status: beta.","source_url":"https://www.sui.io/agentpayments","source_title":"Sui Agent Payments","as_of":"2026-10-19"}]},{"slug":"tempo-wallet","name":"Tempo Wallet","listing_url":"https://theagenteconomy.si/listings/tempo-wallet","compare":[{"title":"Skyfire vs Tempo Wallet","url":"https://theagenteconomy.si/compare/skyfire-vs-tempo-wallet"}],"layers":[{"text":"Payment settlement. The documentation describes a wallet and CLI that preview payment terms and pay under a max spend cap.","source_url":"https://tempo.xyz/developers/docs/wallet/recipes","source_title":"Tempo Wallet agent documentation","as_of":"2026-10-19","layer":"settlement"}],"settlement":[{"text":"Not documented","note":"The checked wallet pages name MPP terms and a spend cap. They do not name stablecoin, card, Lightning, or bank.","source_url":"https://tempo.xyz/developers/docs/wallet/recipes","source_title":"Tempo Wallet agent documentation","as_of":"2026-10-19"}],"composes":[{"text":"The listing source says the wallet previews MPP terms.","source_url":"https://tempo.xyz/developers/docs/guide/machine-payments/agent","source_title":"Tempo guide to paying with the CLI","as_of":"2026-10-19"}],"governance":[{"text":"Tempo publishes the wallet documentation.","source_url":"https://tempo.xyz/developers/docs/wallet/recipes","source_title":"Tempo Wallet agent documentation","as_of":"2026-10-19"}],"license":[{"text":"Not documented","note":"The listing has no public repository. The checked page does not name a license.","source_url":"https://tempo.xyz/developers/docs/wallet/recipes","source_title":"Tempo Wallet agent documentation","as_of":"2026-10-19"}],"status":[{"text":"Directory status: live.","note":"The directory classified the listing as live when the page was checked.","source_url":"https://tempo.xyz/developers/docs/wallet/recipes","source_title":"Tempo Wallet agent documentation","as_of":"2026-10-19"}]},{"slug":"ucp","name":"Universal Commerce Protocol","listing_url":"https://theagenteconomy.si/listings/ucp","compare":[{"title":"Agentic Commerce Protocol vs Universal Commerce Protocol","url":"https://theagenteconomy.si/compare/agentic-commerce-protocol-vs-ucp"}],"layers":[{"text":"Checkout and commerce. The specification says businesses and platforms negotiate capabilities and payment handlers.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21","layer":"checkout"},{"text":"Identity and auth. The specification defines HTTP message signatures and public keys on the profile.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The specification separates payment instruments from payment handlers. It does not fix one settlement asset for the protocol.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"}],"composes":[{"text":"The specification defines REST, MCP, and A2A transports.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"},{"text":"The specification describes AP2 mandate signing and says a business that does not use AP2 may publish a single baseline key.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"},{"text":"The specification defines optional Web Bot Auth interop, including a Signature-Agent header and the tag web-bot-auth.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"}],"governance":[{"text":"The specification overview says reverse domain names encode governance authority and that this removes the need for a central registry.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"}],"license":[{"text":"Apache-2.0.","source_url":"https://github.com/Universal-Commerce-Protocol/ucp/blob/main/LICENSE","source_title":"Universal Commerce Protocol LICENSE","as_of":"2026-10-21"}],"status":[{"text":"Live. A current specification is published at the UCP specification URL.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"}]},{"slug":"visa-trusted-agent-protocol","name":"Visa Trusted Agent Protocol","listing_url":"https://theagenteconomy.si/listings/visa-trusted-agent-protocol","compare":[{"title":"Visa Trusted Agent Protocol vs Web Bot Auth","url":"https://theagenteconomy.si/compare/visa-trusted-agent-protocol-vs-web-bot-auth"}],"layers":[{"text":"Identity and auth. Merchants verify an agent from an RFC 9421 HTTP message signature bound to the site and the action.","source_url":"https://developer.visa.com/docs/trusted-agent-protocol","source_title":"Visa Developer Center: getting started with Trusted Agent Protocol","as_of":"2026-10-21","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The specification describes a payment container signature. It does not name a settlement asset for the protocol itself.","source_url":"https://developer.visa.com/capabilities/trusted-agent-protocol/trusted-agent-protocol-specifications","source_title":"Visa Trusted Agent Protocol specifications","as_of":"2026-10-21"}],"composes":[{"text":"The specification says the agent recognition signature is based on RFC 9421 and aligned with web-bot-auth.","source_url":"https://developer.visa.com/capabilities/trusted-agent-protocol/trusted-agent-protocol-specifications","source_title":"Visa Trusted Agent Protocol specifications","as_of":"2026-10-21"}],"governance":[{"text":"Visa publishes the specification.","source_url":"https://developer.visa.com/docs/trusted-agent-protocol","source_title":"Visa Developer Center: getting started with Trusted Agent Protocol","as_of":"2026-10-21"}],"license":[{"text":"Not documented","note":"The listing source says the reference code is under Visa terms, not an open source license. This matrix did not read a LICENSE file in that repository on 2026-10-21.","source_url":"https://github.com/visa/trusted-agent-protocol","source_title":"Trusted Agent Protocol reference code on GitHub","as_of":"2026-10-21"}],"status":[{"text":"The Visa press release dated July 2, 2026 reports live European merchant purchases through the protocol.","source_url":"https://www.visa.co.uk/about-visa/newsroom/press-releases.3457328.html","source_title":"Visa press release on live agentic transactions in Europe (Jul 2, 2026)","as_of":"2026-10-21"},{"text":"A Visa developer use case page says the product is in development and deployment.","source_url":"https://developer.visa.com/use-cases/trusted-agent-protocol","source_title":"Visa Trusted Agent Protocol use case","as_of":"2026-10-21"}]},{"slug":"web-bot-auth","name":"Web Bot Auth","listing_url":"https://theagenteconomy.si/listings/web-bot-auth","compare":[{"title":"Microsoft Entra Agent ID vs Web Bot Auth","url":"https://theagenteconomy.si/compare/entra-agent-id-vs-web-bot-auth"},{"title":"Visa Trusted Agent Protocol vs Web Bot Auth","url":"https://theagenteconomy.si/compare/visa-trusted-agent-protocol-vs-web-bot-auth"}],"layers":[{"text":"Identity and auth. An automated client signs HTTP requests so a site can verify which bot or agent sent them.","source_url":"https://developers.cloudflare.com/bots/reference/bot-verification/web-bot-auth/","source_title":"Cloudflare Web Bot Auth documentation","as_of":"2026-10-19","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The draft and the Cloudflare documentation used for the listing do not name a settlement asset.","source_url":"https://datatracker.ietf.org/doc/draft-ietf-webbotauth-httpsig-protocol/","source_title":"IETF webbotauth working group draft: HTTP Message Signatures for automated traffic","as_of":"2026-10-19"}],"composes":[{"text":"Visa's Trusted Agent Protocol specification says its agent recognition signature is aligned with web-bot-auth.","source_url":"https://developer.visa.com/capabilities/trusted-agent-protocol/trusted-agent-protocol-specifications","source_title":"Visa Trusted Agent Protocol specifications","as_of":"2026-10-21"},{"text":"The UCP specification defines optional Web Bot Auth interop for key lookup and signatures.","source_url":"https://ucp.dev/latest/specification/overview/","source_title":"Universal Commerce Protocol specification","as_of":"2026-10-21"}],"governance":[{"text":"The signature rules are an IETF working group draft.","source_url":"https://datatracker.ietf.org/doc/draft-ietf-webbotauth-httpsig-protocol/","source_title":"IETF webbotauth working group draft: HTTP Message Signatures for automated traffic","as_of":"2026-10-19"}],"license":[{"text":"Apache-2.0 for the Cloudflare repository.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/cloudflare/web-bot-auth","source_title":"GitHub repository cloudflare/web-bot-auth","as_of":"2026-10-21"},{"text":"Not documented","note":"This cell does not state a separate license for the IETF draft text.","source_url":"https://datatracker.ietf.org/doc/draft-ietf-webbotauth-httpsig-protocol/","source_title":"IETF webbotauth working group draft: HTTP Message Signatures for automated traffic","as_of":"2026-10-19"}],"status":[{"text":"Draft. The IETF datatracker lists a working group draft. The directory lists the method as beta and says it is not yet a standard.","source_url":"https://datatracker.ietf.org/doc/draft-ietf-webbotauth-httpsig-protocol/","source_title":"IETF webbotauth working group draft: HTTP Message Signatures for automated traffic","as_of":"2026-10-19"}]},{"slug":"x401","name":"x401","listing_url":"https://theagenteconomy.si/listings/x401","compare":[],"layers":[{"text":"Identity and auth. A server sends a proof request header for a verifiable credential, and the agent returns a proof response.","source_url":"https://x401.proof.com/spec/latest/","source_title":"x401 HTTP proof requirement protocol","as_of":"2026-10-20","layer":"identity"}],"settlement":[{"text":"Not documented","note":"The listing summary says payment stays on HTTP 402. The checked summary does not name a settlement asset.","source_url":"https://x401.proof.com/spec/latest/","source_title":"x401 HTTP proof requirement protocol","as_of":"2026-10-20"}],"composes":[{"text":"Not documented","note":"The listing summary separates this proof flow from payment and does not name the x402 protocol.","source_url":"https://x401.proof.com/spec/latest/","source_title":"x401 HTTP proof requirement protocol","as_of":"2026-10-20"}],"governance":[{"text":"Proof publishes the specification.","source_url":"https://dev.proof.com/docs/x401","source_title":"Proof developer guide to x401","as_of":"2026-10-20"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/proof/x401","source_title":"GitHub repository proof/x401","as_of":"2026-10-21"}],"status":[{"text":"Beta. The listing summary says the draft protocol is at version 0.2.0. Directory status: beta.","source_url":"https://x401.proof.com/spec/latest/","source_title":"x401 HTTP proof requirement protocol","as_of":"2026-10-20"}]},{"slug":"x402","name":"x402","listing_url":"https://theagenteconomy.si/listings/x402","compare":[{"title":"L402 vs x402","url":"https://theagenteconomy.si/compare/l402-vs-x402"},{"title":"Machine Payments Protocol vs x402","url":"https://theagenteconomy.si/compare/mpp-vs-x402"}],"layers":[{"text":"Payment settlement. A server answers with HTTP 402, the client pays and retries, and a facilitator can verify and settle the payment.","source_url":"https://x402.org/","source_title":"x402 site","as_of":"2026-10-21","layer":"settlement"}],"settlement":[{"text":"The x402.org FAQ says stablecoin payments are the primary use case, and that the protocol is extensible to traditional payment methods.","source_url":"https://x402.org/","source_title":"x402 site","as_of":"2026-10-21"},{"text":"The same FAQ says x402 supports EVM compatible chains, Solana, and more.","source_url":"https://x402.org/","source_title":"x402 site","as_of":"2026-10-21"},{"text":"The Linux Foundation announcement says payment types range from traditional cards to stablecoins.","source_url":"https://www.linuxfoundation.org/press/linux-foundation-announces-operational-launch-of-x402-foundation-to-standardize-internet-native-payments-for-ai-agents-and-applications","source_title":"Linux Foundation announcement of the x402 Foundation, 14 July 2026","as_of":"2026-10-21"}],"composes":[{"text":"The A2A x402 extension v0.2 spec defines an A2A extension for x402 payments, including an embedded flow inside AP2.","source_url":"https://github.com/google-agentic-commerce/a2a-x402/blob/main/spec/v0.2/spec.md","source_title":"A2A x402 payments extension v0.2","as_of":"2026-10-21"},{"text":"AP2's site links a human not present sample that uses x402.","source_url":"https://ap2-protocol.org/","source_title":"AP2 protocol documentation","as_of":"2026-10-21"},{"text":"The MPP documentation index includes a guide for using MPP with x402.","source_url":"https://mpp.dev/","source_title":"MPP protocol site","as_of":"2026-10-21"},{"text":"Mastercard's 2026-10-20 article says Agent Pay for Machines builds on x402.","source_url":"https://www.mastercard.com/global/en/news-and-trends/press/2026/october/Mastercard-Agent-Pay-for-Machines-in-action.html","source_title":"Mastercard Agent Pay for Machines at Cloudflare Connect, 2026-10-20","as_of":"2026-10-21"},{"text":"ERC-8004 says examples show x402 payments enriching feedback, and that payments are outside the ERC.","source_url":"https://eips.ethereum.org/EIPS/eip-8004","source_title":"ERC-8004 Trustless Agents","as_of":"2026-10-21"}],"governance":[{"text":"The Linux Foundation announcement on 14 July 2026 says Coinbase contributed the protocol and the x402 Foundation stewards it.","source_url":"https://www.linuxfoundation.org/press/linux-foundation-announces-operational-launch-of-x402-foundation-to-standardize-internet-native-payments-for-ai-agents-and-applications","source_title":"Linux Foundation announcement of the x402 Foundation, 14 July 2026","as_of":"2026-10-21"}],"license":[{"text":"Apache-2.0.","note":"The GitHub license API reported this SPDX identifier on 2026-10-21.","source_url":"https://github.com/x402-foundation/x402","source_title":"GitHub repository x402-foundation/x402","as_of":"2026-10-21"}],"status":[{"text":"Live. The x402.org FAQ says the protocol is production ready.","source_url":"https://x402.org/","source_title":"x402 site","as_of":"2026-10-21"}]}]}