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x402 Trust & Discovery API — Pre-Purchase Safety Check
x402
x402 Trust & Discovery API — Pre-Purchase Safety Check is a paid API for AI agents from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us, paid per call via x402, $0.05/call, status down (last checked 2026-10-02).
Checks whether an x402 or MPP payment endpoint is safe to pay and whether your credential type (EIP-3009 or Circle Gateway) is compatible, returning a go/test/do-not-pay verdict before any funds are spent.
Price / call$0.05
Success—
StatusDown
How this service works
Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for "is this API endpoint a scam" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.
Output
A JSON response containing a safety verdict (go, test-with-minimum, or do-not-pay), credential compatibility status indicating whether the specified credential type (eip3009 or gateway) can pay the endpoint, and supporting data from onchain settlement history on Base.
Example use cases
Pre-payment scam check for new API
“I found this x402 API at https://unknown-provider.io/v1/report — can you check if it's legit and safe to pay before I actually spend anything on it?”
Credential compatibility before purchase
“I only have a Circle Gateway credential — can you check whether https://dataservice.example.com/v1/prices will actually accept it, so I don't waste a transaction finding out it won't?”
Onchain reputation check for AI agent
“My agent is about to auto-pay https://analytics.example.com/v1/insights using eip3009 — can you pull its settlement history and safety verdict so I can decide whether to allow it?”
Technical details
Endpoint
GEThttps://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/guard?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to verify an x402 or MPP payment endpoint before spending funds, especially when credential compatibility (EIP-3009 vs Circle Gateway) is uncertain. It is the only dedicated pre-purchase safety service for this market rather than a generic registry or explorer, and it returns actionable verdicts without requiring an actual payment attempt.
Side effects
- URL not found or not an x402 endpoint — endpoint returns unknown or unresolvable status
- Invalid credential type string — returns error on unrecognized credential value
- Endpoint has no onchain history — verdict may be inconclusive or conservative
- Network timeout reaching the target URL — may return a connectivity error
- Malformed URL input — returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | x402 endpoint URL to check before paying it. |
| credential | string | Optional: eip3009 or gateway. Answers whether the credential you carry can pay this endpoint at all. |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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