{"uid":"cap_rXWj0LW_QNLeHFmi6masf","slug":"phantom-api-monad-gas-estimator-4c890b7f","name":"Phantom API — Monad Gas Estimator","description":"Lightning-fast access to blockchain data, smart contract insights, and Web3 infrastructure across 57+ networks. Pay-per-call via x402.","url":"https://phantom-api-omega.vercel.app/api/monad/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_GFVMpnIKfF2vm0DjfRH0x","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 transactions on the Monad blockchain network given transaction parameters","exampleAgentPrompt":"Before I send this token transfer on Monad — from 0xABCD...1234 to 0xDEAD...5678 with 1 ETH worth of value — can you estimate how much gas it'll need so I know the cost upfront?","exampleUseCases":[{"title":"Pre-flight gas check for token transfer","prompt":"I'm about to send some MON tokens on Monad from my wallet 0xABCD...1234 to 0x5678...BEEF — can you estimate the gas cost before I submit it?"},{"title":"Smart contract call cost estimation","prompt":"I want to call a smart contract on Monad — the contract is at 0xCafe...1234 and here's the encoded calldata: 0xa9059cbb... — how much gas should I expect that to use?"},{"title":"DApp transaction budget planning","prompt":"I'm building a dapp on Monad and need to know the gas estimate for a typical user interaction: from address 0xUser...0001, to contract 0xDapp...0002, with this calldata 0x12345678. What's the gas estimate?"}],"resultDescription":"Returns a gas estimate (in gas units) for the described Monad transaction, allowing callers to predict fees and set appropriate gas limits before submission. May include estimated gas amount and optionally fee in native units.","failureModes":["Invalid or malformed address in 'to' or 'from' fields returns an error","Malformed calldata in 'data' field causes estimation failure","Monad network node unavailability results in timeout or 503 error","Transactions that would revert may return estimation error or high/infinite gas estimate","Missing required fields may return 400 bad request","Payment not fulfilled (402) if x402 header missing or USDC balance insufficient"],"whenToPreferThis":"Choose this endpoint when you need gas estimation specifically on the Monad network and want pay-per-call pricing without managing your own RPC node infrastructure. Prefer over self-hosted RPC when you want zero-setup access to Monad gas data. Use when your agent workflow needs a pre-flight cost check before submitting a Monad transaction.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T18:46:07.545Z","isFirstParty":false,"canonicalSlug":"phantom-api-monad-gas-estimator-4c890b7f"}