{"uid":"cap_z_XqaaCE7GKtYnCMiv5Ox","slug":"x402-tools-signature-classifier-sigclass-41ab50b0","name":"x402-tools Signature Classifier (sigclass)","description":"Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.","url":"https://openclawproductions.com/api/v1/sigclass?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"reason":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}},"inputSchema":{"type":"object","required":["type","properties"],"properties":{"type":{"type":"string","const":"object"},"required":{"type":"array","items":{"type":"string"}},"properties":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"sku":"sigclass","note":"Example paid JSON shape. Not a live settle.","price":"$0.03","title":"Sig Class"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Kz6Yl6mZcT_NNrDQBYYEL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Classifies EIP-3009 signature failure reasons from facilitator error messages returned in HTTP 402 responses","exampleAgentPrompt":"Classify this EIP-3009 revert string I got back from the OpenX402 facilitator in a 402 response: 'TransferWithAuthorization: invalid nonce' — what does it mean and which sigclass category does it fall into?","exampleUseCases":[{"title":"Debug a rejected x402 payment signature","prompt":"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?"},{"title":"Interpret facilitator invalidReason in agent","prompt":"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."},{"title":"Diagnose micropayment authorization failure","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:41:47.063Z","isFirstParty":false,"canonicalSlug":"x402-tools-signature-classifier-sigclass-41ab50b0"}