{"uid":"cap_WQGpQ9RxdfQi44Ne_cSdP","slug":"gas-sponsor-check-cd4f3c7e","name":"Gas Sponsor Check","description":"🆕 A smart account's gas can be paid by a PAYMASTER instead of the account itself — invisible to every 'does this wallet spend ETH' heuristic. Reads a wallet's UserOperationEvents across BOTH EntryPoints (v0.6 + v0.7): is it a smart account, its op count and success rate, and WHO sponsors its gas (self vs which paymaster, per-sponsor share). A fully-sponsored account is typically app- or agent-operated. wallet= required, days= optional (default 30, max 90). Not financial advice.","url":"https://402.com.tr/api/x402/gas-payer","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"pathParams":{"type":"object"},"queryParams":{"type":"object","required":["wallet"],"properties":{"days":{"type":"string","description":"Lookback days (optional)"},"wallet":{"type":"string","description":"Wallet address"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_yiq1c65KGPaIrGiKiZ11h","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Analyzes a wallet's ERC-4337 UserOperationEvents across both EntryPoints to determine if it's a smart account, its operation count and success rate, and who sponsors its gas fees (self vs. which paymaster).","exampleAgentPrompt":"Can you check if the wallet 0xAbC123...def456 is a smart account and find out who's been sponsoring its gas fees over the last 30 days — I want to know the paymaster breakdown and whether it's fully sponsored.","exampleUseCases":[{"title":"Detect agent-operated wallet activity","prompt":"I need to know if wallet 0x4f3eA...b12c is app- or agent-operated — check if its gas is fully sponsored by a paymaster over the last 60 days and tell me the sponsorship breakdown."},{"title":"Smart account due diligence before transfer","prompt":"Before I send funds to 0x9aD2...88Fc, can you tell me if it's a smart account, what its UserOp success rate looks like, and whether its gas is self-paid or covered by a third-party paymaster? Look at the last 30 days."},{"title":"Audit counterparty gas payment behavior","prompt":"I'm screening 0xF7cB...3301 as a potential counterparty — can you pull its ERC-4337 op history and tell me if any paymaster is covering its gas, how often, and what share of ops are sponsored vs self-paid over the past 90 days?"}],"resultDescription":"Returns whether the wallet is a smart account, its total UserOperation count and success rate across EntryPoint v0.6 and v0.7, and a breakdown of who pays its gas: self-funded vs. each sponsoring paymaster with their per-sponsor share of operations.","failureModes":["Missing wallet parameter returns validation error","Invalid wallet address format causes a bad request error","Wallet with no ERC-4337 activity returns empty or zero op count","Days parameter exceeding 90 is rejected or capped","Network timeouts when querying both EntryPoints simultaneously","Non-Base/Ethereum-compatible address may return no results"],"whenToPreferThis":"Choose this endpoint when you need to determine whether a wallet is a smart account (ERC-4337), who is paying its gas fees, and whether it appears to be app- or agent-operated based on paymaster sponsorship patterns. It is especially useful for counterparty screening, fraud detection, and distinguishing human-operated EOAs from programmatic smart accounts — particularly when native ETH balance heuristics would miss paymaster-subsidized wallets.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:07:42.576Z","isFirstParty":false}