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minia2a x402 Payment Audit (Black-Box Buyer Trust Check)
x402
minia2a x402 Payment Audit (Black-Box Buyer Trust Check) is a paid API for AI agents from minia2a.uk, paid per call via x402, $5/call, status unknown (last checked 2026-09-15).
Performs a black-box security audit of an x402 payment endpoint to verify it properly rejects forged transaction hashes, invalid signatures, and replay attacks before you pay — returning SAFE, RISK, or NOT_X402.
Price / call$5
Success—
StatusUnknown
How this service works
Black-box check: does the x402 endpoint verify payment (reject forged txHash/signature/replay) before delivering? Buyer-side trust check before you pay. Returns SAFE/RISK/NOT_X402.
Output
Returns one of three verdict strings: SAFE (the endpoint correctly rejects forged txHash, invalid signatures, and replay attacks — safe to pay), RISK (the endpoint has detectable weaknesses in payment verification — payment fraud possible), or NOT_X402 (the endpoint does not appear to implement the x402 payment protocol at all). May include additional detail on which specific checks passed or failed.
Example use cases
Pre-payment buyer trust verification
“I found an x402 endpoint I want to call, but before I hand over any USDC I want to know if it actually enforces payment — can you run a black-box audit on it and tell me if it comes back SAFE, RISK, or NOT_X402?”
Replay attack vulnerability check
“Can you probe this x402 API to see if it would accept a replayed payment transaction? I need to know if it's vulnerable before I integrate it into my app.”
Forged signature rejection test
“I'm evaluating an x402 service for my agent workflow — audit it to see whether it properly rejects forged transaction hashes and bad signatures, and give me the trust verdict.”
Technical details
Endpoint
GEThttps://minia2a.uk/x402/x402-payment-auditWhen to prefer
Use this endpoint when you are a buyer or agent about to pay an x402-gated API and want to confirm the endpoint actually enforces payment integrity before committing USDC. Prefer this over manual inspection when you cannot read the server-side source code (black-box scenario). Also prefer this over the white-box source audit endpoint when you only have the live URL and no access to the implementation code.
Side effects
- Endpoint unreachable or returns non-HTTP response — audit cannot complete
- Target endpoint uses non-standard x402 implementation that confuses probing — may return NOT_X402 incorrectly
- Network timeout probing the target — incomplete verdict
- Target endpoint rate-limits audit probe requests — partial results
- Ambiguous payment verification behavior — may return RISK with low confidence
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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