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x402-tools Signature Classifier (sigclass)
x402
x402-tools Signature Classifier (sigclass) is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-11).
Classifies EIP-3009 signature failure reasons from facilitator error messages returned in HTTP 402 responses
Price / call$0.03
Success—
StatusUnknown
How this service works
Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.
Output
Returns a JSON object containing the SKU name ('sigclass'), a classification or diagnostic note about the provided EIP-3009 revert/error string, the price ($0.03), and a title. The classification tells the caller what category of signature or authorization failure the facilitator reason corresponds to.
Example use cases
Debug a rejected x402 payment signature
“I got a 402 from OpenX402 with the revert string 'TransferWithAuthorization: authorization is expired' — can you classify that error reason and tell me what went wrong with my signature?”
Interpret facilitator invalidReason in agent
“My x402 agent received an HTTP 402 with an eip3009 invalidReason of 'invalid signature' — run a sigclass diagnostic on that reason text so I know how to fix it.”
Diagnose micropayment authorization failure
“Can you use the sigclass tool to classify this EIP-3009 error from an x402 facilitator: 'authorization already used' — I want to know which failure category it maps to.”
Technical details
Endpoint
GEThttps://openclawproductions.com/api/v1/sigclass?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically classify or diagnose EIP-3009 signature failure reasons returned by the OpenX402 facilitator in HTTP 402 responses. It is purpose-built for x402 protocol debugging and is the only known paid diagnostic SKU specifically for sigclass categorization. Prefer it over generic error-parsing logic when dealing with facilitator invalidReason, errorReason, or invalidMessage fields in x402 flows.
Side effects
- Unpaid or unauthenticated requests return HTTP 402 with eip3009 extras (payment required before classification is returned)
- Missing required 'input' object or 'type'/'method' fields returns a validation error
- Unsupported HTTP method (only GET, HEAD, DELETE allowed) returns an error
- Empty or missing 'reason' query parameter may return a generic or null classification
- OpenX402 facilitator unavailability may cause payment settlement failures
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object | |
| inputSchema | object |
Output
Schema · Response
{
"type": "json",
"example": {
"sku": "sigclass",
"note": "Example paid JSON shape. Not a live settle.",
"price": "$0.03",
"title": "Sig Class"
}
}Tags
x402
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