{"uid":"cap_rkLrl_U3ULeLbdSpmd1h_","slug":"cortex-cloud-ethereum-rpc-via-x402-9eaf3560","name":"Cortex Cloud Ethereum RPC via x402","description":"OpenAI-compatible AI and data API for agents. Pay per call in USDC on Base via x402 — no API keys, no subscriptions, no lock-in.","url":"https://api.cortexcloud.org/x402/v1/rpc/ethereum","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"id":{"type":"integer"},"method":{"type":"string"},"params":{"type":"array"}}},"responseSchema":{"type":"object","format":"application/json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_vHdFZljnV8PuLi8Mer0Ad","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Executes Ethereum JSON-RPC calls (e.g. eth_blockNumber, eth_getBalance, eth_call) with per-call USDC micropayment on Base via x402 — no API key required.","exampleAgentPrompt":"Can you call eth_getBalance for wallet address 0xAbCd...1234 on Ethereum mainnet and tell me the current ETH balance? Pay with USDC on Base via x402 — no API key needed.","exampleUseCases":[{"title":"On-chain wallet balance check","prompt":"What's the current ETH balance for address 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum mainnet? Use the Cortex Cloud RPC endpoint and pay per call."},{"title":"Smart contract read via eth_call","prompt":"Call the balanceOf function on the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for my wallet 0x1234...abcd using eth_call — I want to see my USDC holdings on-chain."},{"title":"Fetch latest Ethereum block number","prompt":"What's the latest block number on the Ethereum mainnet right now? Use eth_blockNumber and just pay the small per-call fee."}],"resultDescription":"A JSON-RPC response object containing an id, jsonrpc version string, and a result field whose value depends on the method called — e.g. a hex-encoded balance for eth_getBalance, a hex block number for eth_blockNumber, or encoded return data for eth_call. Errors return a structured error object with code and message.","failureModes":["Unsupported or misspelled RPC method name returns a JSON-RPC error with code -32601","Malformed params array causes a -32602 invalid params error","Insufficient x402 payment or expired payment header results in HTTP 402 rejection before execution","Rate limiting or node unavailability returns HTTP 503 or a timeout","Calling state-mutating methods (e.g. eth_sendRawTransaction) may be blocked or unsupported on this read-oriented endpoint"],"whenToPreferThis":"Choose this endpoint when you need keyless, subscription-free Ethereum JSON-RPC access paid per call in USDC via x402 — ideal for AI agents that lack pre-registered API credentials, need one-off blockchain lookups, or operate in environments where managing API keys is impractical. Prefer over Infura/Alchemy when avoiding upfront account creation or monthly billing is a priority.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:49:31.082Z","isFirstParty":false}