{"uid":"cap_M11SsyGi7-3DlkMqrRTvS","slug":"x402-preflight-wallet-check-13ed4050","name":"x402 Preflight Wallet Check","description":"x402-preflight: confirm your wallet can transact, and see your balance, in one certified call. Pay $0.01 USDC on Base, get a signed on-chain-anchored receipt. The safe first transaction before you ship real volume.","url":"https://preflight.kenoodl.com/preflight","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"wallet":{"type":"string","description":"The Base wallet you want to preflight. If omitted, it defaults to the paying wallet read from the x402 payment payload."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"unknown","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","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_j1Yfg27YcBztd03vc9DnZ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Verifies that a Base wallet can transact via x402 and returns the wallet balance along with a signed, on-chain-anchored receipt for $0.01 USDC.","exampleAgentPrompt":"Run an x402 preflight check on my Base wallet 0xAbC123... to confirm it can transact and show me my USDC balance — I want the signed on-chain receipt before I start sending real volume.","exampleUseCases":[{"title":"Validate wallet readiness before launch","prompt":"I'm about to integrate x402 payments into my app and need to verify that my Base wallet 0xAbC123... is actually set up to transact. Can you run the preflight check so I know I won't hit any surprises when real users start paying?"},{"title":"Check USDC balance with certified proof","prompt":"Before I send a large payment to a vendor, I want to confirm my Base wallet has enough USDC and get a cryptographic receipt proving the wallet is live. Can you run the x402 preflight so I have on-chain evidence everything is working?"},{"title":"Test x402 payments with minimal risk","prompt":"I want to make sure x402 payments work on my Base wallet without risking real money yet. Can you do a preflight check that costs just a penny, gives me my current balance, and returns a signed receipt I can show as proof the system is ready?"}],"resultDescription":"Returns a signed, on-chain-anchored receipt confirming the wallet's ability to transact via x402, along with the current wallet balance on Base, all certified by a $0.01 USDC payment.","failureModes":["Wallet address is invalid or not a Base-compatible address — returns error indicating bad wallet format","Insufficient USDC balance to cover the $0.01 fee — payment fails and no receipt is issued","x402 payment payload is missing or malformed — endpoint cannot identify the paying wallet","Network or RPC issues on Base — transaction cannot be confirmed, timeout or 5xx error returned","Wallet has no on-chain history and cannot be preflighted — may return empty or unresolvable state"],"whenToPreferThis":"Use this endpoint when you need a low-cost, certified end-to-end test of a Base wallet's x402 payment capability before committing to real transaction volume. It is specifically designed as the canonical 'first transaction' for x402 agents — combining wallet validation, balance check, and receipt issuance in a single call. Prefer this over manual balance checks or dry-run simulations when you need an actual on-chain-anchored proof of transactability.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T13:27:05.990Z","isFirstParty":false}