{"uid":"cap_rfOBAt7E9M2qonOltVd9c","slug":"agent402-tools-ethereum-json-rpc-passthrough-8647a3d6","name":"agent402.tools Ethereum JSON-RPC Passthrough","description":"Escape hatch for power users: forward an arbitrary read-only JSON-RPC method to the chain. Method must be in our read-only whitelist (eth_call, eth_getLogs, eth_getBlockByNumber, eth_getTransactionReceipt, eth_chainId, eth_blockNumber, etc.). Mutating methods (eth_sendTransaction, eth_sendRawTransaction) are rejected - sign and broadcast through your own provider.","url":"https://agent402.tools/api/eth-call","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"method":{"type":"string","description":"JSON-RPC method (must be in the read-only whitelist)."},"params":{"type":"array","description":"JSON-RPC parameter array (often empty for simple methods)."},"network":{"type":"string","description":"ethereum / base / polygon / arbitrum / optimism (default base)."}}},"responseSchema":{"type":"json","example":{"method":"eth_blockNumber","result":"0x1234567","network":"base"}},"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_ueya70Gu8x9O3Sn36lsDK","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":"Forwards arbitrary read-only JSON-RPC method calls to EVM-compatible blockchain networks via a whitelisted set of safe, non-mutating methods","exampleAgentPrompt":"Can you call eth_call on Base with params [{'to':'0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913','data':'0x18160ddd'},[]] so I can read the total supply of that contract?","exampleUseCases":null,"resultDescription":"Returns the JSON-RPC response object for the requested read-only method, including the result field (e.g. hex-encoded return value for eth_call, block object for eth_getBlockByNumber, array of log objects for eth_getLogs, or a hex block number for eth_blockNumber)","failureModes":["Method not in read-only whitelist — endpoint rejects mutating or unsupported methods","Invalid params array for the chosen method — JSON-RPC error returned","Unsupported network name — defaults to Base or returns an error","Malformed JSON body — 400 bad request","Network congestion or node unavailability — upstream RPC timeout or 503","Payment not completed via x402 protocol — 402 Payment Required"],"whenToPreferThis":"Use this endpoint when you need to make arbitrary read-only JSON-RPC calls to EVM chains (Ethereum, Base, Polygon, Arbitrum, Optimism) without managing your own RPC node or API key. Ideal for power-user scenarios where pre-built endpoints don't cover the exact method needed. Prefer this over managed single-purpose endpoints when you need low-level access to eth_call, eth_getLogs, eth_getBlockByNumber, eth_getTransactionReceipt, or eth_blockNumber directly.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:14:02.943Z","isFirstParty":false}