{"uid":"cap_mzZFaDr2sjbiNomCDlupV","slug":"quietsignal-wallet-preflight-2142adef","name":"QuietSignal Wallet Preflight","description":"QuietSignal Public Data: independent, read-only rollup, wallet, opportunity, and developer-data facts for agents, paid per request with USDC over HTTP 402 on Base.","url":"https://83-29-153-50.sslip.io/v1/wallet-preflight","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"},"queryParams":{"type":"object","required":["address"],"properties":{"address":{"type":"string","description":"Public 20-byte EVM address to inspect"}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"schema":"base-wallet-preflight/v1","address":"0x0000000000000000000000000000000000000000","network":"eip155:8453","disclaimer":"Read-only public blockchain facts; no signing, transfer, or investment advice.","has_native_balance":false,"has_stablecoin_balance":false}},"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":"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_Btd5zvWibGlnTQIswH1tt","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":"Returns read-only preflight facts about an EVM wallet address on Base, including native and stablecoin balance presence.","exampleAgentPrompt":"Can you do a quick preflight check on the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 to see if it has any native ETH or stablecoin balance on Base?","exampleUseCases":[{"title":"Pre-send wallet readiness check","prompt":"Before I send any USDC, can you check if 0x742d35Cc6634C0532925a3b844Bc454e4438f44e has any native balance on Base so I know it's an active wallet?"},{"title":"DeFi agent opportunity screening","prompt":"I'm about to interact with wallet 0xAbCd1234AbCd1234AbCd1234AbCd1234AbCd1234 — can you run a preflight to see if it holds any native tokens or stablecoins on Base?"},{"title":"Empty wallet detection for cleanup","prompt":"Can you check whether 0x0000000000000000000000000000000000000001 has any ETH or stablecoin balance on Base? I want to know if it's effectively empty before I remove it from my watchlist."}],"resultDescription":"Returns a JSON object conforming to the base-wallet-preflight/v1 schema, including the queried address, network identifier (eip155:8453 for Base), boolean flags for whether the wallet holds any native balance and any stablecoin balance, and a legal disclaimer noting the data is read-only public blockchain facts with no investment advice.","failureModes":["Missing or malformed 'address' query parameter returns a 400-level error","Invalid EVM address format (not a 20-byte hex) likely returns a validation error","Payment not supplied or insufficient USDC triggers HTTP 402 requiring x402 payment flow","Address not found on Base returns false for both balance flags rather than an error","Network unavailability or RPC issues may cause 5xx responses"],"whenToPreferThis":"Choose this endpoint when an agent needs a fast, cheap ($0.01 USDC) read-only signal about whether a Base network wallet holds any native or stablecoin assets — particularly useful as a preflight step before initiating transactions, filtering wallets in bulk pipelines, or validating addresses prior to DeFi interactions. Prefer this over a full on-chain RPC call when you want a structured, schema-versioned JSON response without managing RPC infrastructure.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T16:25:40.407Z","isFirstParty":false}