{"uid":"cap_IHm_9BPIHW-k-Px8xfwIJ","slug":"synapse-api-blockchain-gas-estimator-6688e66f","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/degen/gas/estimate?utm_source=zero.xyz","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_vkGuZw3leCxPB88qitEHf","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 the gas cost for a transaction on a blockchain network given transaction parameters such as sender, recipient, data payload, and value.","exampleAgentPrompt":"Estimate the gas needed for a transaction from 0xAbC...123 to 0xDeF...456 with a value of 0.5 ETH and this calldata: 0xa9059cbb...","exampleUseCases":[{"title":"Pre-flight smart contract call check","prompt":"Before I send this contract interaction — from 0x1234...abcd to 0xcontract...5678 with calldata 0xa9059cbb000...and zero ETH value — can you estimate how much gas it will consume?"},{"title":"Token transfer cost estimation","prompt":"I'm about to send 100 USDC on-chain. Can you estimate the gas fee for a transfer from my wallet 0xAAA...111 to 0xBBB...222 using the ERC-20 transfer calldata?"},{"title":"DeFi swap gas budget planning","prompt":"I want to know how much gas a Uniswap swap will use — from address 0xDEF...999 calling the swap router at 0xRouter...000 with this encoded swap data and 0 ETH value, so I can decide if it's worth executing right now."}],"resultDescription":"Returns an estimated gas amount (in gas units) for the specified transaction, allowing the caller to budget fees and decide whether to proceed with the on-chain operation.","failureModes":["Invalid or malformed address in 'to' or 'from' fields returns an error","Malformed or non-hex 'data' field causes parsing failure","Network unavailable or unsupported chain results in a timeout or error response","Insufficient context (missing required fields) may return a default or zero estimate","Rate limiting or payment failure returns a 402 Payment Required response"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call gas estimate without maintaining your own blockchain node or RPC infrastructure. Ideal for agents that need to pre-check transaction costs across multiple blockchain networks before committing funds, especially in a degen/DeFi context where gas volatility matters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:42:23.021Z","isFirstParty":false,"canonicalSlug":"synapse-api-blockchain-gas-estimator-6688e66f"}