Reference
Concepts
This index lists every concept page in the directory. Each line is one sentence from that page's opening answer, so a new page shows up here when it joins the concept list. The pages quote sourced documents. Nothing on this index is scored.
Last verified 2026-10-28
- Agent spend controlsAgent spending is bounded only where a vendor document states the bound.
- How do you revoke an AI agent's credentials?An agent credential can be revoked only where a checked page states the path.
- How is x402 volume measuredAs of 2026-10-21, x402.org showed 75.41M transactions and $24.24M under Last 30 Days, and x402scan showed 3.06M transactions and $1.50M under Past 30 Days.
- Who handles a refund when an agent paysA refund follows the page for that rail.
- x402 volume, claimed and measuredPublic x402 volume figures disagree, and this page does not merge them.