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x402 Endpoint Validator
x402
x402 Endpoint Validator is a paid API for AI agents from earner-shop.earner-shop-3xz9.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Checks whether a live x402 endpoint is genuinely payable by fetching it, decoding its PAYMENT-REQUIRED challenge, verifying payment terms, and returning actionable fixes for any issues found.
Price / call$0.01
Success—
StatusUnknown
How this service works
Checks whether a live x402 endpoint is actually payable. Fetches the target, decodes its PAYMENT-REQUIRED challenge, verifies the payment terms are well-formed, renders prices in human units, and returns the precise fixes for anything that would stop an agent from paying.
Output
A JSON object containing: a verdict string ('payable', 'warnings', 'broken', etc.), a summary sentence, the decoded payment accepts array with human-readable prices (e.g. '0.01 USDC'), the final URL after any redirects, the HTTP status code, the x402 protocol version, and a list of issues each with a severity level, error code, human-readable message, and a precise fix recommendation.
Example use cases
Debug a broken x402 paywall
“My x402 endpoint at https://myapi.example.com/premium keeps failing when agents try to pay — can you validate it and tell me exactly what's misconfigured?”
Pre-flight check before listing an endpoint
“Before I publish my x402 endpoint at https://data.example.com/reports to a marketplace, can you verify the payment challenge is well-formed and agents will be able to pay it?”
Inspect a third-party x402 endpoint
“I found an x402 endpoint at https://partner.example.com/feed and want to know its payment terms and whether it's actually payable — can you decode and validate it for me?”
Technical details
Endpoint
GEThttps://earner-shop.earner-shop-3xz9.workers.dev/v1/validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that an x402 endpoint is correctly configured and genuinely payable before attempting to pay it, listing it in a marketplace, or routing agent traffic to it. It is the right choice when you have a specific URL to inspect and want decoded payment terms plus actionable diagnostics — not for discovering x402 endpoints or making payments.
Side effects
- Target URL is unreachable or times out — returns error with network failure details
- Target URL does not return a 402 status — returns verdict indicating endpoint is not an x402 paywall
- Payment challenge is malformed JSON — returns parsing error with specifics
- Missing required payment fields (e.g. payTo, asset) — returned as issues list with severity 'error'
- Redirect loop or too many redirects — returns error about final URL resolution failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"issues": [
{
"fix": "Set it (300 is a sane default) so agents know how long the authorization stays valid.",
"code": "missing_timeout",
"message": "accepts[0].maxTimeoutSeconds is missing",
"severity": "warning"
}
],
"target": "https://api.example.com/paid",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x0000000000000000000000000000000000000000",
"price": "0.01 USDC",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"summary": "Payable, with 1 issue that will cost you buyers.",
"verdict": "warnings",
"finalUrl": "https://api.example.com/paid",
"httpStatus": 402,
"x402Version": 2
}
}Tags
x402
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