{"uid":"cap_NfMg00nSU9DtE38UkfYFe","slug":"speraxos-erc-8004-agent-reputation-head-check-077b0420","name":"SperaxOS ERC-8004 Agent Reputation HEAD Check","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/reputation/%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_8jFol3CTMPtbpIJINzO3A","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":"Checks the ERC-8004 reputation metadata availability for a given agent ID on the SperaxOS DeFi intelligence platform via a lightweight HEAD request, payable with USDC on Base.","exampleAgentPrompt":"Can you check whether the agent with ID 0xABC123 has an ERC-8004 reputation record on SperaxOS — just a quick existence check, no need to fetch the full data?","exampleUseCases":[{"title":"Pre-interaction agent reputation check","prompt":"Before I let this DeFi agent 0xDEADBEEF interact with my funds, can you verify it actually has a reputation record registered on SperaxOS?"},{"title":"Agent fleet onboarding validation","prompt":"I'm onboarding a set of agents — can you check whether agent ID 0x1234ABCD has an ERC-8004 reputation profile on SperaxOS so I know it's already registered?"},{"title":"DeFi protocol trust screening","prompt":"Check if the agent 0x9876FEDC is listed with a reputation on the SperaxOS ERC-8004 registry — I want to know if it's a known entity before routing any transactions through it."}],"resultDescription":"Returns HTTP headers only (HEAD response) indicating whether an ERC-8004 reputation record exists for the specified agent ID. Status codes and headers signal availability; no response body is returned. Costs $0.001 USDC per call via x402 payment protocol.","failureModes":["404 Not Found — agent ID has no ERC-8004 reputation record registered","402 Payment Required — USDC payment not attached or insufficient","400 Bad Request — malformed agentId in the URL path","503 Service Unavailable — SperaxOS backend temporarily down","Payment failure on Base network — transaction not confirmed"],"whenToPreferThis":"Use this endpoint when you need a fast, low-cost existence check for an agent's ERC-8004 reputation record without fetching the full payload. Ideal for pre-flight validation before deeper DeFi interactions, and preferable over a GET when you only need to confirm presence. Requires no API key — only a USDC micropayment on Base via x402.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T12:39:03.067Z","isFirstParty":false,"canonicalSlug":"speraxos-erc-8004-agent-reputation-head-check-077b0420"}