{"uid":"cap_GqLr4QiRjndVFPvdQ_KXo","slug":"synapse-api-optimism-gas-estimator-3c258b59","name":"Synapse API — Optimism 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/optimism/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_SLrTXcpClliwN5DVjPIn9","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 the Optimism (OP Mainnet) blockchain given sender, recipient, calldata, and value.","exampleAgentPrompt":"Estimate the gas cost for sending 0.5 ETH on Optimism from 0xAbCd...1234 to 0xDeFg...5678 with no calldata.","exampleUseCases":[{"title":"Pre-flight cost check for ETH transfer","prompt":"Before I send 1 ETH to 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Optimism from my wallet 0xAbCd1234..., can you estimate how much gas I'll need?"},{"title":"Smart contract call cost estimation","prompt":"I want to call a smart contract on Optimism — the contract is at 0xDeFg5678... and the encoded calldata is 0xa9059cbb0000.... Can you estimate the gas cost before I submit the transaction?"},{"title":"DeFi swap gas budgeting","prompt":"I'm planning a token swap on Optimism from address 0x1111... to DEX contract 0x2222... with calldata 0x38ed1739... and value 0. What's the estimated gas I should budget for this?"}],"resultDescription":"Returns an estimated gas amount (in gas units) needed to execute the specified transaction on Optimism, helping callers budget fees before submitting the transaction on-chain.","failureModes":["Invalid or malformed address in 'to' or 'from' fields returns a 4xx error","Invalid hex calldata in 'data' field causes a parsing error","Optimism node unavailability results in a 5xx or timeout","Insufficient or missing required fields may return a validation error","Transaction simulation reverts (e.g. contract call would fail) may return an error or revert reason"],"whenToPreferThis":"Use this endpoint when you need a quick, pay-per-call gas estimate specifically for the Optimism (OP Mainnet) L2 network without running your own node. It is preferable when you want a lightweight, pre-submission cost check for ETH transfers or contract calls on Optimism and don't need a full node setup or SDK integration.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:57:44.263Z","isFirstParty":false}