{"uid":"cap_nXZc1bMKIEnI0A2VJ5Z4_","slug":"x402-multi-chain-evm-rpc-proxy-226728f2","name":"x402 Multi-Chain EVM RPC Proxy","description":"Safelisted read-only JSON-RPC proxy across major EVM chains (base, ethereum, polygon, arbitrum, optimism) — eth_call, eth_getBalance, eth_getTransactionReceipt, eth_getBlockByNumber, and more","url":"https://x402tap.com/api/rpc?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["method"],"properties":{"chain":{"type":"string","description":"Chain to query: base, ethereum, polygon, arbitrum, optimism (default base)"},"method":{"type":"string","description":"Read-only JSON-RPC method name, e.g. eth_getBalance, eth_call, eth_blockNumber"},"params":{"type":"string","description":"JSON-encoded array of RPC params, e.g. [\"0xabc...\",\"latest\"] (default [])"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"chain":"Base","method":"eth_blockNumber","result":"0x1234567"}},"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_InvsoL_8apfsHOEkQHIJR","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":"Executes read-only JSON-RPC calls (eth_call, eth_getBalance, eth_getTransactionReceipt, etc.) against major EVM chains via a pay-per-call proxy","exampleAgentPrompt":"What's the current ETH balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet?","exampleUseCases":[{"title":"Verify on-chain transaction status","prompt":"Can you check whether transaction 0xabc123...def on Polygon confirmed successfully and how much gas it used?"},{"title":"Read smart contract state on Base","prompt":"Call the balanceOf function on the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for my wallet 0x1234...5678 on Base — what's my token balance?"},{"title":"Monitor latest block on Arbitrum","prompt":"Fetch the latest block number on Arbitrum so I can check how far behind my local node is."}],"resultDescription":"A JSON object containing the chain name, the RPC method called, and the result field with the raw RPC response value (e.g. hex-encoded balance, block number, transaction receipt object, or contract return data).","failureModes":["Unsupported or write-only RPC method returns an error (only safelisted read-only methods allowed)","Invalid or malformed params JSON array causes a parse error","Unsupported chain name returns an error (only base, ethereum, polygon, arbitrum, optimism accepted)","Invalid wallet address or transaction hash causes RPC-level error","Payment not received causes 402 rejection before the call is executed","Network timeout from the upstream RPC node"],"whenToPreferThis":"Choose this endpoint when you need lightweight, pay-per-call read-only access to EVM chain state across multiple networks without managing your own RPC provider keys or subscriptions. It is ideal for agents that occasionally query on-chain data across chains like Base, Ethereum, Polygon, Arbitrum, and Optimism without committing to a monthly RPC plan. Prefer alternatives (e.g. a dedicated Alchemy or Infura subscription) for high-volume or write operations.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T18:33:13.843Z","isFirstParty":false,"canonicalSlug":"x402-multi-chain-evm-rpc-proxy-226728f2"}