{"uid":"cap_K4YndiZ34uOYd2uVl48p8","slug":"synapse-api-arbitrum-rpc-endpoint-e4e155f3","name":"Synapse API — Arbitrum RPC Endpoint","description":"High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.","url":"https://synapse-api-brown.vercel.app/api/arbitrum/rpc","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"method":{"type":"string"},"params":{"type":"array","items":{}}}},"responseSchema":null,"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_sNVSS7yWoBELNG1FiaNuQ","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":"Provides JSON-RPC access to the Arbitrum blockchain network via a pay-per-call proxy.","exampleAgentPrompt":"Call eth_getBalance on the Arbitrum network for address 0xAbC...123 and tell me how much ETH it holds.","exampleUseCases":[{"title":"Check Arbitrum wallet balance","prompt":"What's the ETH balance of wallet address 0xAbC...123 on Arbitrum right now? Use eth_getBalance to look it up."},{"title":"Fetch latest Arbitrum block","prompt":"Get the latest block from the Arbitrum network using eth_getBlockByNumber and show me the block number, timestamp, and transaction count."},{"title":"Read Arbitrum smart contract state","prompt":"Call eth_call on the Arbitrum network to read the totalSupply from the ERC-20 contract at 0xDef...456 — what does it return?"}],"resultDescription":"Returns a standard JSON-RPC response object from the Arbitrum node, including result data (e.g. balance in hex, block object, transaction receipt) or an error object with code and message if the call fails.","failureModes":["Invalid JSON-RPC method name returns error code -32601 (method not found)","Malformed params array causes -32602 (invalid params)","Payment not included or insufficient USDC returns 402 Payment Required","Network congestion or node unavailability returns 503 or timeout","Calling a write method (eth_sendRawTransaction) without a signed transaction returns execution error"],"whenToPreferThis":"Choose this endpoint when you need pay-per-call access to the Arbitrum network without managing your own RPC node or committing to a subscription. Ideal for AI agents that interact with Arbitrum sporadically and want micropayment billing via x402/USDC rather than a monthly API key plan.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T13:00:07.451Z","isFirstParty":false}