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x402 Endpoint Linter
x402
x402 Endpoint Linter is a paid API for AI agents from klane402.deanhiki.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).
Validates and lints an x402 payment endpoint URL, checking its 402 response, version, payment fields, asset validity, and price metadata before you pay it.
Price / call$0.01
Success—
StatusUnknown
How this service works
Lint any x402 endpoint before you pay it: fetches the URL, checks 402 status, x402Version, accepts[] fields (scheme, network, amount, asset, payTo, resource, timeout), known USDC asset, price in USD and discovery metadata. Returns {ok, issues[], summary}. Query: url. $0.01.
Output
Returns a JSON object with: ok (boolean indicating overall validity), issues (array of strings describing specific problems found), and summary (object with network name and priceUSD). A clean endpoint returns ok:true and an empty issues array.
Example use cases
Pre-payment endpoint health check
“I'm about to integrate with this x402 API at https://api.someservice.dev/weather — can you lint it first and tell me if the payment fields like scheme, network, amount, and payTo look correct?”
Debugging a misconfigured x402 service
“My x402 endpoint at https://mypaywall.example.com/report keeps failing — can you run a lint check on it and list any issues with the 402 response or accepts fields?”
Auditing x402 price and asset before workflow
“Before my agent starts calling https://klane402.deanhiki.workers.dev/api/some-endpoint repeatedly, lint it and confirm the price in USD, network, and USDC asset are all valid so I'm not sending payments blindly.”
Technical details
Endpoint
GEThttps://klane402.deanhiki.workers.dev/api/x402-lint?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate an x402 payment endpoint before committing a payment, integrating it into an automated workflow, or diagnosing why an x402 API is not behaving correctly. It is the only known purpose-built x402 lint tool and is ideal as a pre-flight check step in any agent that consumes x402-gated APIs.
Side effects
- URL does not return HTTP 402 status — reported as an issue
- Missing or invalid x402Version field in response
- accepts[] array missing required fields like scheme, network, amount, asset, payTo, resource, or timeout
- Unknown or unsupported USDC asset address — flagged as issue
- URL is unreachable or times out — returns ok:false with connectivity issue
- Malformed JSON in 402 response body
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"issues": [],
"summary": {
"network": "base",
"priceUSD": 0.002
}
}
}Tags
x402
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