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mm-agent-utils x402 Endpoint Linter
x402
mm-agent-utils x402 Endpoint Linter is a paid API for AI agents from mm-agent-utils.gferrigno.deno.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-10).
Lints and validates an x402-enabled HTTP endpoint, checking its payment offers, compliance, and configuration correctness.
Price / call$0.003
Success—
StatusUnknown
How this service works
Tiny pay-per-call utilities for agents on Base: wallet vetting, x402 endpoint linting, deterministic entity extraction.
Output
Returns a JSON object containing the linted endpoint URL, an array of payment offers (each with pay_to address, network, USDC price, and asset symbol), a verdict ('ok' or error), any warnings, the HTTP status code, and the x402 protocol version detected.
Example use cases
Pre-launch x402 compliance check
“Before I go live, can you check my x402 endpoint at https://api.myservice.com/premium-data and tell me if there are any warnings or misconfigurations I should fix?”
Debugging a broken pay-per-call API
“My x402 endpoint at https://tools.acme.dev/v1/report isn't accepting payments properly — can you lint it and show me what the verdict is and what offers it exposes?”
Auditing a third-party paid endpoint
“I want to use this paid API at https://data.provider.io/endpoint but I'm not sure it's legit — can you inspect its x402 payment offers and tell me the pay-to address, network, and price?”
Technical details
Endpoint
GEThttps://mm-agent-utils.gferrigno.deno.net/v1/x402-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that a specific URL is a correctly configured x402 pay-per-call endpoint — especially before integrating it into an agent workflow, debugging payment failures, or auditing third-party x402 APIs for correctness. Prefer it over manual inspection when you need structured output including offer details, warnings, and a machine-readable verdict.
Side effects
- Target URL is not reachable or times out
- Target URL does not return a 402 status (not an x402 endpoint)
- Malformed or missing x402 payment headers result in warnings or error verdict
- Non-HTTPS URLs rejected by input schema
- Invalid or missing 'url' query parameter returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com/paid-endpoint",
"offers": [
{
"pay_to": "0x...",
"network": "eip155:8453",
"price_usdc": "0.01",
"asset_symbol": "USDC"
}
],
"verdict": "ok",
"warnings": [],
"http_status": 402,
"x402_version": 2
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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