{"uid":"cap_TI5v8JVsDPylj3hLa5btI","slug":"speraxos-etherscan-data-api-x402-5df695bd","name":"SperaxOS Etherscan Data API (x402)","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/data/etherscan?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"required":{"type":"string"},"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_i6jS9PwIFQ5GWBdia-RwU","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":"Retrieves on-chain Ethereum data via Etherscan, payable per-request with USDC on Base using the x402 protocol — no API key required.","exampleAgentPrompt":"Pull the full transaction history for Ethereum address 0xAbC...123 from Etherscan — I need to see all ERC-20 token transfers and ETH sends.","exampleUseCases":[{"title":"Wallet transaction history audit","prompt":"Get me all the transactions for Ethereum wallet 0xAbC...123 from Etherscan so I can see what moved in and out over the past month."},{"title":"Token balance snapshot for DeFi portfolio","prompt":"Look up the current ERC-20 token balances held by 0xDef...456 on Ethereum — I want to know what tokens they're holding right now."},{"title":"Smart contract event inspection","prompt":"Fetch the recent event logs for smart contract 0x789...GHI on Ethereum — I'm trying to track all the Swap events emitted in the last 500 blocks."}],"resultDescription":"Returns Etherscan on-chain data such as transaction lists, token balances, contract events, or block information for the queried Ethereum address or entity, delivered as structured JSON.","failureModes":["Invalid Ethereum address format returns an error","Payment of 0.001 USDC via x402 not included causes 402 Payment Required response","Etherscan rate limits or downtime may cause upstream errors","Querying a non-existent transaction hash returns empty or not-found result","Missing required query parameters returns a 400-level error"],"whenToPreferThis":"Choose this endpoint when you need trustless, pay-per-request access to Etherscan data without managing API keys, especially useful for AI agents operating autonomously with a crypto wallet on Base. Ideal for on-demand Ethereum on-chain lookups in DeFi workflows where microtransaction payment (x402) is already supported.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T01:43:59.228Z","isFirstParty":false,"canonicalSlug":"speraxos-etherscan-data-api-x402-5df695bd"}