{"uid":"cap_834LrXaEnC2XepxbFAX6E","slug":"synapse-api-blockchain-gas-estimator-b09c356e","name":"Synapse API — Blockchain Gas Estimator","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/stable/gas/estimate","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"to":{"type":"string"},"data":{"type":"string"},"from":{"type":"string"},"value":{"type":"string"}}},"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_O8zXOrsIC_ZJCW8Igj20L","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":"Estimates gas costs for a transaction on a blockchain network given sender, recipient, calldata, and value","exampleAgentPrompt":"Estimate the gas for a transaction from 0xAbc123... to 0xDef456... with calldata 0xa9059cbb... and a value of 0 ETH, so I know if it's safe to submit.","exampleUseCases":[{"title":"Pre-flight gas check for token transfer","prompt":"Before I send 500 USDC from 0xSender... to 0xRecipient... on-chain, estimate the gas cost so I can make sure I have enough ETH to cover fees."},{"title":"Smart contract interaction cost preview","prompt":"I'm about to call a DeFi contract at 0xContract... with this calldata 0xabcdef... — can you estimate the gas it'll use so I can decide whether it's worth executing right now?"},{"title":"Batch transaction cost planning","prompt":"I need to figure out how expensive it will be to execute this transaction: from 0xMyWallet..., to 0xProtocol..., data 0x1234abcd..., value 0. Give me a gas estimate so I can plan my budget."}],"resultDescription":"Returns an estimated gas amount (in gas units) required to execute the described transaction, allowing agents to assess transaction feasibility and fee costs before submission.","failureModes":["Invalid or malformed address in 'to' or 'from' fields returns an error","Malformed calldata hex string causes a parsing error","Unavailable or unsupported chain context may return an error or null estimate","Network timeout or RPC failure on the backend returns a 5xx error","Missing required fields results in a 400 validation error"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call gas estimate for a blockchain transaction without maintaining your own RPC node. Prefer it over direct RPC calls when operating in a serverless or agent context where infrastructure management is undesirable. It supports 57+ blockchain networks, making it suitable for multi-chain use cases without configuring separate providers.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:12:44.844Z","isFirstParty":false}