{"uid":"cap_iy-vbJ-sujhc-6b3sc_m2","slug":"ethereum-mainnet-eth-blocknumber-c4f00109","name":"Ethereum Mainnet eth_blockNumber","description":"ARYSPHERE sells AI-written verdicts on Base token contracts (a grade, a one-liner, a roast and the contract's facts) and Base/Ethereum chain reads, paid per call in USDC on Base over x402 v2. No account and no API key.","url":"https://api.arysphere.com/v1/ventures/x402_eth_reads_v1/eth_mainnet_eth_blocknumber?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"ok":true,"hex":"0x18ff378","chain":"ethereum","method":"eth_blockNumber","result":26211192,"service":"x402_eth_reads_v1.eth_mainnet_eth_blocknumber"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_VNrvqgk5LulNZq49vtUK9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the latest Ethereum mainnet block number via the eth_blockNumber JSON-RPC call, requiring no input parameters.","exampleAgentPrompt":"What is the current block number on Ethereum mainnet right now?","exampleUseCases":[{"title":"Monitor Ethereum block progression","prompt":"Keep checking the Ethereum mainnet block number every minute and let me know when it advances by more than 5 blocks — I want to make sure the chain isn't stalling."},{"title":"Verify blockchain sync status","prompt":"What's the latest Ethereum mainnet block number? I need to confirm my node is synced to the chain head."},{"title":"Anchor timestamp to block height","prompt":"Fetch the current Ethereum mainnet block number so I can use it as a reference point to look up events relative to right now."}],"resultDescription":"Returns a single integer representing the latest confirmed block number on the Ethereum mainnet, expressed in hexadecimal (standard eth_blockNumber RPC response format). No additional data is returned.","failureModes":["Network or gateway timeout resulting in no response","Arysphere gateway unavailable returns 5xx error","Insufficient USDC payment (x402 payment required response) if payment header is missing or malformed","Rate limiting if too many requests are made in quick succession"],"whenToPreferThis":"Use this endpoint when you need a quick, lightweight, no-parameter read of the current Ethereum mainnet chain height — particularly useful as a polling primitive for block-based monitoring, as a reference anchor for relative block queries, or to verify chain liveness. Prefer this over full block retrieval endpoints when you only need the block number and not block content.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T12:40:39.378Z","isFirstParty":false,"canonicalSlug":"ethereum-mainnet-eth-blocknumber-c4f00109"}