Methodology
x402 payments
ia.x402 · 4.12
Act
MAY
Recommendation
AR-ACT-08
Why it matters
The x402 protocol uses HTTP 402 Payment Required responses so agents can negotiate micropayments before consuming a paid API. A commerce site that supports x402 lets agents transact without manual checkout.
How to fix it
Return HTTP 402 with an x402 payment challenge on paid endpoints.
-
Choose the paid endpoints and the price per call.
-
Return HTTP 402 with the x402 payment requirements when a request has no payment.
Verify
Run a new scan for this checkpoint:
isagentready results {domain} --checkpoint ia.x402
Details Mapping, lifecycle and references
- AR mapping
- Partial match
- Evidence source
- agentready.org AR-ACT-08
- Score role
- Informational
- Introduced
- 2026-08-24
- Methodology version
- 2026-10-22