{"uid":"cap__CXK6PRpxAf2rtp602bmW","slug":"chainread-block-lookup-e6b7ead5","name":"ChainRead Block Lookup","description":"Pay-per-call HTTP APIs, paid with x402 in USDC on Base (eip155:8453): agentkit, api-change-check, basedue, basewatch, chainread, check-sanctions, chgwatch, company-facts, composite, edgar, feednews, pageaudit, solcheck, token-dd, txpreflight, walletcheck, webmd, webread, websearch, x402index. Each operation describes its service.","url":"https://api.firstmention.uk/s/chainread/block?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"hash":{"type":"string","description":"0x transaction hash (for /tx)"},"chain":{"enum":["base","ethereum"],"type":"string"},"number":{"type":"string","description":"Block number or 'latest' (for /block)"},"address":{"type":"string","description":"0x address or ERC-20 contract address"},"addresses":{"type":"array","items":{"type":"string"},"description":"Up to 25 addresses (for /batch)"}}},"responseSchema":{"type":"json","example":{"risk":"medium","_meta":{"payer":"0x...","price_usd":0.01},"chain":"base","flags":[{"code":"owner_holds_power","severity":"high"}],"score":45,"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","verdict":"CAUTION"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1Y3E_LAQJPe_NY8oDzTB3","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches on-chain block data for a specified block number or 'latest' on Base or Ethereum, paid per-call via x402 USDC micropayment.","exampleAgentPrompt":"Can you fetch block number 19000000 on Ethereum for me so I can see what's in it?","exampleUseCases":[{"title":"Audit recent Base block","prompt":"Pull up the latest block on Base so I can see what just got confirmed on-chain."},{"title":"Verify specific Ethereum block","prompt":"Look up block 18500000 on Ethereum and tell me the details."},{"title":"Monitor block finality","prompt":"Fetch block number 5000000 on Base — I want to confirm it's been finalized and see the block data."}],"resultDescription":"Returns a JSON object with the block data including chain identifier, risk/score fields if applicable, flags, verdict, and metadata about the payer address and price paid in USD.","failureModes":["Invalid block number format returns an error","Block number not yet mined returns not-found error","Unsupported chain value (not 'base' or 'ethereum') returns validation error","Payment failure via x402 results in 402 response requiring USDC payment on Base","Network timeout if the RPC node is slow"],"whenToPreferThis":"Use this endpoint when an AI agent needs to retrieve on-chain block details from Base or Ethereum and can pay $0.01 USDC per call via the x402 micropayment protocol — ideal for agents that need trustless, pay-per-use access without API key management.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T12:42:52.755Z","isFirstParty":false,"canonicalSlug":"chainread-block-lookup-e6b7ead5"}