{"uid":"cap_EqJo_69jElFNXfAirHqJx","slug":"delx-commerce-evm-signature-v-classifier-a100d5a1","name":"Delx Commerce — EVM Signature V Classifier","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.delx.ai/api/v1/x402/evm-signature-v-classify?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"v":{"type":"integer","description":"V supplied to EVM Signature V Classify; used only for this bounded calculation and processed in memory without retention."},"chain_id":{"type":"integer","description":"Chain Id supplied to EVM Signature V Classify; used only for this bounded calculation and processed in memory without retention."}}},"responseSchema":{"type":"json","example":{"result":{"v":27,"classification":"legacy","expected_chain_id":8453},"schema":"delx/util-evm-signature-v-classify/v1","status":"pass","evidence":{"retained":false,"input_sha256":"7717f04f6d982d96f99fcfa69caef99e8c3090309ae581ae53da0c8612700635","external_calls":0},"operation":"evm_preflight:evm_signature_v_classify"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_fulHwkTBogsbZKcWLdSOc","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Classifies an EVM transaction signature's V value as legacy, EIP-155, or other type given a chain ID, enabling preflight validation of Ethereum signature recovery parameters.","exampleAgentPrompt":"Can you classify this EVM signature V value of 27 for chain ID 8453 — I need to know if it's legacy or EIP-155 before I process this transaction?","exampleUseCases":[{"title":"Pre-submission signature validation on Base","prompt":"Before I relay this Ethereum transaction on Base (chain ID 8453), can you classify the signature V value of 37 to check whether it's EIP-155 compliant or legacy?"},{"title":"Debugging unexpected signature recovery","prompt":"I'm getting signature recovery errors on chain 1 — can you classify V value 28 for chain ID 1 and tell me what type it should be and what chain ID is expected?"},{"title":"Automated preflight in transaction pipeline","prompt":"As part of my transaction signing pipeline, classify V value 0 against chain ID 137 so I know whether to treat this as a legacy or EIP-155 signature before broadcasting."}],"resultDescription":"Returns a JSON object with the original V value, its classification (e.g. 'legacy', 'EIP-155'), the expected chain ID derived from V, operation label, pass/fail status, and a cryptographic evidence record including input SHA-256 hash, a flag confirming no data retention, and external call count — enabling verifiable, auditable classification.","failureModes":["Invalid or missing V value — returns validation error","Invalid or missing chain_id — returns validation error","V value outside supported EVM ranges — may return unclassified result","Network or payment failure via x402 protocol — request not processed"],"whenToPreferThis":"Choose this endpoint when you need a fast, verifiable, pay-per-use classification of an EVM signature V value without signing up for an account. Ideal for AI agents doing preflight checks before broadcasting EVM transactions, especially when auditability matters — the response includes a SHA-256 evidence hash confirming no data retention. At $0.001 USDC per call it suits high-frequency pipelines.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:53:50.006Z","isFirstParty":false,"canonicalSlug":"delx-commerce-evm-signature-v-classifier-a100d5a1"}