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Agent Transaction Trust — Public Transaction Preflight
x402
Agent Transaction Trust — Public Transaction Preflight is a paid API for AI agents from json-repair-api-9ybv.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Validates an x402 PAYMENT-REQUIRED challenge against an intended HTTP request and returns APPROVED, REVIEW, or DENIED with signed proof of merchant/payment risk assessment — no account required.
Price / call$0.001
Success—
StatusUnknown
How this service works
Public, account-free preflight for an autonomous x402 payment. Validates the merchant's exact PAYMENT-REQUIRED challenge against the intended request, checks Base USDC payment integrity and public merchant/payTo risk evidence, and returns APPROVED, REVIEW or DENIED with signed proof. It does not grant spending authority: an APPROVED result means the transaction evidence is clear enough to proceed only if separate delegated authority also permits the spend.
Output
Returns a trust decision of APPROVED, REVIEW, or DENIED along with signed proof of the assessment, merchant/payTo risk evidence, and Base USDC payment integrity findings. Does not grant spending authority — an APPROVED result only confirms the transaction evidence is clean; separate delegated authority must also permit the spend.
Example use cases
Pre-authorize agent API marketplace payment
“My AI agent wants to call a paid API at https://api.datavendor.com/prices and just received a PAYMENT-REQUIRED challenge — can you preflight that x402 challenge against the intended GET request and tell me if the merchant risk looks clean before we proceed?”
Flag suspicious x402 merchant before spend
“Before my agent pays 0.001 USDC to merchant 'quickdata-services.io' via x402, run a preflight check on their PAYMENT-REQUIRED payload against the POST to https://quickdata-services.io/query and let me know if it comes back DENIED or needs review.”
Audit trail for autonomous payment compliance
“For compliance logging, preflight the x402 PAYMENT-REQUIRED challenge my agent received for a 'market-data' category purchase at https://feeds.tradinginfo.net/live — I need the signed proof result showing APPROVED before the spend is authorized downstream.”
Technical details
Endpoint
POSThttps://json-repair-api-9ybv.onrender.com/trust/x402/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent has received an x402 PAYMENT-REQUIRED challenge and needs a lightweight, account-free risk verdict before deciding whether to proceed with a Base USDC payment. It is the right choice for a stateless preflight check that requires no pre-registration — ideal as an early gate in a multi-step autonomous payment pipeline where a separate authorization step will still control actual fund movement.
Side effects
- Malformed or missing payment_required payload causes validation failure
- Mismatch between the provided request and the x402 challenge results in DENIED
- Unknown or unresolvable merchant hostname returns REVIEW with limited risk evidence
- Invalid JSON in payment_required encoded string causes parse error
- Missing required request.method or request.url fields returns 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request | object | Exact HTTP request the agent intends to make after the preflight. |
| category | string | Optional purchase category for audit context. |
| merchant_id | string | Optional stable merchant identifier. If omitted, the resource hostname is used. |
| payment_required | — | The merchant's real x402 PAYMENT-REQUIRED payload, as decoded JSON or its encoded string. |
Tags
x402
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