{"uid":"cap_W5L9t1iSiyDejnbqGtdxE","slug":"synapse-api-unichain-gas-estimator-9b0b1de3","name":"Synapse API — Unichain 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/unichain/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_BADFakr_M8BjCFHjQpwZn","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 Unichain blockchain network given sender, recipient, calldata, and value","exampleAgentPrompt":"Estimate how much gas it will take to call this contract on Unichain — sending from 0xAbC...123 to 0xDef...456 with calldata 0xa9059cbb...000 and value 0.","exampleUseCases":[{"title":"Pre-flight gas check for token transfer","prompt":"Before I send this ERC-20 transfer on Unichain, estimate the gas — from 0xSender123 to 0xRecipient456, calldata is 0xa9059cbb... and value is 0."},{"title":"Smart contract deployment cost estimate","prompt":"Can you estimate how much gas deploying my contract will use on Unichain? From address 0xDeploy789, no recipient needed, and the bytecode is 0x608060..."},{"title":"DeFi swap gas sanity check","prompt":"I want to know the gas cost for this Unichain DEX swap before I submit it — from 0xMyWallet to 0xRouterContract, calldata is 0x38ed1739..., value is 1000000000000000000."}],"resultDescription":"Returns a gas estimate (likely in gas units) for the described transaction on Unichain, allowing callers to budget fees or validate feasibility before broadcasting the actual transaction.","failureModes":["Invalid or malformed Ethereum address for 'to' or 'from' fields returns an error","Invalid calldata hex string causes parsing failure","Network unavailability or Unichain node issues may return a timeout or 5xx error","Payment failure via x402 protocol results in 402 Payment Required","Transactions that would revert on-chain may return an error or revert reason rather than a gas estimate"],"whenToPreferThis":"Choose this endpoint when you need a quick, pay-per-call gas estimate specifically on the Unichain network without setting up your own RPC node or managing API keys beyond x402 USDC micropayments. Ideal for agents that need to pre-check transaction feasibility or cost on Unichain before committing funds.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:04:09.158Z","isFirstParty":false}