# x402 Trust & Discovery API — Pre-Purchase Safety Check

> 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 2026-10-01).

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.

## Facts

- Endpoint: GET https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/guard?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: down
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trust-discovery-api-pre-purchase-safety-check-c1696e78
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cvUbTfNy2zTJ7y6DW2jTo

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-trust-discovery-api-pre-purchase-safety-check-c1696e78
```

Example prompt: Before I pay it, can you check whether this x402 endpoint is safe and whether my eip3009 credential will actually work with it: https://someapi.example.com/v1/data?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "x402 endpoint URL to check before paying it."
  },
  "credential": {
   "type": "string",
   "description": "Optional: eip3009 or gateway. Answers whether the credential you carry can pay this endpoint at all."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trust-discovery-api-pre-purchase-safety-check-c1696e78/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us](https://www.zero.xyz/host/gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/llms.txt)