{"uid":"cap_zQ-3BZGrVvw7xBZz5uOVc","slug":"arysphere-eth-chainid-read-083a52b5","name":"ARYSPHERE eth_chainId Read","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_chain_reads_v1/eth_chainid?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"ok":true,"hex":"0x1","chain":"ethereum","method":"eth_chainId","result":1,"service":"x402_chain_reads_v1.eth_chainid"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_cf4w9z54E_vvrs5x7kRnB","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the chain ID of the Ethereum mainnet via a pay-per-call x402 API endpoint requiring no account or API key.","exampleAgentPrompt":"What is the chain ID for Ethereum mainnet? I need the hex and numeric values and I don't want to set up an account anywhere.","exampleUseCases":[{"title":"Confirm Ethereum mainnet identity","prompt":"Can you check the Ethereum chain ID right now so I can confirm my app is pointed at mainnet and not a testnet?"},{"title":"Build multi-chain routing logic","prompt":"I need to dynamically look up the Ethereum chain ID at runtime to route transactions correctly — can you fetch it for me?"},{"title":"Validate network before a contract call","prompt":"Before I send a transaction, can you verify the chain ID of Ethereum mainnet so I know I'm on the right network?"}],"resultDescription":"A JSON object containing 'ok' (boolean success flag), 'hex' (chain ID in hexadecimal, e.g. '0x1'), 'chain' (network name string, e.g. 'ethereum'), 'method' (the RPC method called, e.g. 'eth_chainId'), 'result' (numeric chain ID, e.g. 1), and 'service' (internal service identifier string).","failureModes":["Payment not fulfilled — 402 response if USDC payment on Base is missing or insufficient","Network error reaching Ethereum RPC — may return ok:false or timeout","Malformed request — endpoint accepts no meaningful input parameters so failures are typically payment or infrastructure related"],"whenToPreferThis":"Prefer this endpoint when you need a quick, no-account, no-API-key Ethereum chain ID lookup paid per-call in USDC on Base. Ideal for agents or serverless workflows that need lightweight, trust-minimized chain reads without managing credentials or subscriptions.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T12:40:46.022Z","isFirstParty":false,"canonicalSlug":"arysphere-eth-chainid-read-083a52b5"}