{"uid":"cap_8BBZlwEyERSuCHf2i1DoI","slug":"speraxos-erc-8004-agent-identity-validation-8c15619c","name":"SperaxOS ERC-8004 Agent Identity Validation","description":"AI-powered DeFi intelligence APIs payable via the x402 HTTP payment protocol. No API key required — pay per request with USDC on Base. Identity-only (SIWX) endpoints are free for wallets with an agentcash identity.","url":"https://chat.sperax.io/api/x402/v1/erc8004/validation/%7BagentId%7D?utm_source=zero.xyz","method":"HEAD","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":null,"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_2aHvC-BHMZeC3G3j2Byew","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0xD74f5255D557944cf7Dd0E45FF521520002D5748","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates whether a given agent ID has a registered ERC-8004 identity on the SperaxOS agentcash platform via a lightweight HEAD request","exampleAgentPrompt":"Check whether agent ID 0xabc123 has a valid ERC-8004 identity registered on SperaxOS agentcash before I try to use the DeFi intelligence APIs.","exampleUseCases":[{"title":"Pre-flight agent identity check","prompt":"Before my DeFi agent calls any SperaxOS intelligence APIs, verify that its agent ID 0xdef456 has a registered ERC-8004 identity on the agentcash platform so we don't waste paid API calls."},{"title":"Onboarding identity validation gate","prompt":"I'm onboarding a new AI agent with ID 0x789abc to our DeFi workflow — can you confirm it has a valid agentcash identity on SperaxOS so it can access the free SIWX endpoints?"},{"title":"Troubleshoot missing identity access","prompt":"My agent with ID 0x112233 keeps getting rejected from SperaxOS free-tier endpoints — can you validate whether its ERC-8004 identity is actually registered on agentcash?"}],"resultDescription":"A HEAD response indicating the existence and validity of the ERC-8004 agent identity: HTTP 200 means the agentId is registered and valid on SperaxOS agentcash; HTTP 402 or 404 indicates the identity is absent, unrecognized, or payment is required for further access.","failureModes":["agentId not found in the ERC-8004 registry — returns 404 or equivalent not-found status","malformed agentId path parameter — returns 400 bad request","identity exists but lacks sufficient permissions — returns 403","network or server error on chat.sperax.io — returns 5xx","payment required for non-SIWX endpoint variant — returns 402 with x402 payment details"],"whenToPreferThis":"Choose this endpoint when you need a zero-cost, lightweight check of whether a specific agent ID holds a registered ERC-8004 / agentcash identity on SperaxOS before committing to paid DeFi intelligence API calls. It is a HEAD request, so it is fast and incurs no response body overhead. Prefer this over full GET requests when you only need a boolean existence check, not full identity data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T06:37:09.505Z","isFirstParty":false,"canonicalSlug":"speraxos-erc-8004-agent-identity-validation-8c15619c"}