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x402 Dev Tools – API Origin Linter
x402
x402 Dev Tools – API Origin Linter is a paid API for AI agents from dev.kagurazaka.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Lints an x402 API origin by fetching its OpenAPI and discovery docs, probing paid routes without payment, and reporting 402 compliance errors, price mismatches, and missing Bazaar extensions.
Price / call$0.01
Success—
StatusUnknown
How this service works
Checks an x402 API origin the way x402scan, the CDP Bazaar and agents read it: fetches /openapi.json and /.well-known/x402, then calls each paid route without paying (up to 30) and decodes its 402. Reports routes that do not answer 402, missing or v1-only PAYMENT-REQUIRED headers, prices that differ from the OpenAPI document, resource URLs that differ from the route, wrong USDC EIP-712 domains, missing Bazaar extensions and missing descriptions.
Output
Returns a JSON object with an ok flag, the API name, origin, count of paid and checked routes, a list of routes with their 402 status and declared vs actual prices, an array of findings (each with level, location, and message), and counts of errors and warnings.
Example use cases
Pre-launch x402 API compliance check
“Before I publish my API to the CDP Bazaar, can you run a lint check on https://api.myservice.com and tell me everything that's wrong — missing 402 responses, price mismatches, bad EIP-712 domains, the works?”
Debugging x402scan visibility issue
“My API at https://api.weather-paid.com isn't showing up properly on x402scan. Can you lint it and tell me what's misconfigured — especially any routes that aren't answering 402 or have wrong PAYMENT-REQUIRED headers?”
Verifying Bazaar listing readiness
“I want to list https://api.dataprovider.io on the CDP Bazaar — can you check it for missing Bazaar extensions, undescribed routes, and any price differences between what the OpenAPI doc says and what the 402 actually returns?”
Technical details
Endpoint
GEThttps://dev.kagurazaka.dev/v1/lint?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate an x402 API origin end-to-end for protocol compliance — specifically when you want to catch 402 response issues, price inconsistencies between OpenAPI declarations and live 402 responses, missing CDP Bazaar extensions, or wrong EIP-712 USDC domains. It is the canonical pre-publish linter for x402 APIs and mirrors the exact checks performed by x402scan, the CDP Bazaar crawler, and agent discovery systems.
Side effects
- Origin is unreachable or returns non-HTTPS URL — request fails or no routes checked
- Origin has no /openapi.json — missing OpenAPI findings reported
- No paid routes found — returns zero checked_routes with no findings
- Rate limiting or network timeout on probed routes — some routes may not be checked
- Origin returns malformed 402 responses — decode errors reported as findings
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": false,
"name": "Weather API",
"errors": 1,
"origin": "https://api.example.com",
"routes": [
{
"path": "/v1/weather",
"bazaar": true,
"method": "GET",
"status": 402,
"price_usd": 0.001,
"declared_usd": 0.002
}
],
"findings": [
{
"level": "error",
"where": "GET /v1/weather",
"message": "the 402 asks $0.001 but the OpenAPI document declares $0.002"
}
],
"warnings": 1,
"paid_routes": 2,
"checked_routes": 2
}
}Tags
x402
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