{"uid":"cap_UvDUTrcy4E7YK4UBSXA5E","slug":"ethereum-mainnet-latest-block-number-c9c5ea42","name":"Ethereum Mainnet Latest Block Number","description":"Call when an agent needs the latest Ethereum mainnet block number. Send tag latest, or an empty object. Read-only eth_blockNumber on eip155:1. No spend. Send JSON {\"tag\":\"latest\"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-block-number first.","url":"https://agentshelf.syntexa.ch/v1/eth-block-number?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"tag":{"type":"string","const":"latest","examples":["latest"],"description":"Block tag. Only latest is accepted. Example: latest. Omit it for the same current Ethereum mainnet block number. No address."}}},"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_3gyKDjttUCJ_exS4apXVR","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":"Returns the current latest block number on Ethereum mainnet (eip155:1) via a read-only eth_blockNumber call","exampleAgentPrompt":"What is the latest block number on the Ethereum mainnet right now?","exampleUseCases":[{"title":"Real-time Ethereum block monitoring","prompt":"Keep checking the current Ethereum block number every minute and let me know when it reaches 22000000."},{"title":"Smart contract deployment timing","prompt":"Before I deploy my contract, what is the current Ethereum mainnet block number so I can record it as a reference point?"},{"title":"On-chain data synchronization check","prompt":"What is the latest Ethereum mainnet block height right now? I need to verify my local node is in sync."}],"resultDescription":"Returns the current latest block number on Ethereum mainnet as a numeric value, representing the chain height at the time of the request.","failureModes":["Network or RPC node unavailability returns a 5xx error","Invalid or non-'latest' tag value returns a 4xx validation error","Payment failure or insufficient USDC balance returns a 402 Payment Required","Rate limiting may return a 429 Too Many Requests error"],"whenToPreferThis":"Use this endpoint when an agent needs a quick, cheap, read-only lookup of the current Ethereum mainnet block number without running a full node or maintaining an RPC connection. Ideal for lightweight agents that need periodic chain height checks, synchronization verification, or timestamping on-chain events by block number. At $0.001 USDC per call it is cost-effective for frequent polling. Try the free sandbox endpoint first for testing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T12:40:36.119Z","isFirstParty":false,"canonicalSlug":"ethereum-mainnet-latest-block-number-c9c5ea42"}