{"uid":"cap_BmwntDTWToV6v2S_AuJrO","slug":"synapse-api-ethereum-gas-estimator-acb46008","name":"Synapse API — Ethereum 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/ethereum/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_9kY8-PPwgXp70VUJQPhNE","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 an Ethereum transaction given sender, recipient, value, and calldata","exampleAgentPrompt":"Estimate how much gas it will take to send 0.5 ETH from 0xAbC...123 to 0xDeF...456 with no extra calldata — I want to know the gas units before I submit the transaction.","exampleUseCases":[{"title":"Pre-flight gas check for ETH transfer","prompt":"Before I send 1 ETH from my wallet 0xAbc123... to 0xDef456..., can you estimate how much gas that transaction will use so I can set my gas limit properly?"},{"title":"Gas cost estimate for smart contract call","prompt":"I'm about to call a smart contract function — from address 0xSender... to contract 0xContract..., with this calldata: 0xa9059cbb000...  Can you estimate the gas this will consume?"},{"title":"Comparing gas costs across transaction types","prompt":"Give me a gas estimate for a zero-value transaction from 0xFrom... to 0xTo... with this ABI-encoded data payload so I can compare it against a plain ETH transfer."}],"resultDescription":"Returns an estimated gas amount (in gas units) required to execute the described Ethereum transaction. The response allows developers and agents to set appropriate gas limits before broadcasting a transaction on-chain.","failureModes":["Invalid Ethereum address format for 'to' or 'from' fields — returns 4xx error","Malformed or non-hex calldata in 'data' field — returns parsing error","Simulated transaction reverts on-chain — may return revert reason or error code","Service unavailable or Ethereum node connectivity issues — returns 5xx error","Missing required fields — may return validation error or default estimate"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call Ethereum gas estimate without running your own Ethereum node or maintaining an RPC subscription. It is ideal for AI agents that need to pre-validate transaction costs before submission, especially in workflows that span 57+ blockchain networks via the same Synapse API suite.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T12:43:19.392Z","isFirstParty":false,"canonicalSlug":"synapse-api-ethereum-gas-estimator-acb46008"}