{"uid":"cap_YdtDV_4ll97DW7HEjDjhZ","slug":"x402-seller-lookup-5cb2d723","name":"x402-seller-lookup","description":"Complete x402 quickstart bundle: v2 Base USDC seller endpoint + EIP-3009 buyer client + deterministic product bundle + tests.","url":"https://loop2-quickstart.manhliemcn4euwlu.workers.dev/mkt/seller?utm_source=zero.xyz","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","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["format"],"properties":{"format":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"format":{"type":"string"},"example":{"type":"string"}}}}},"responseSchema":{"type":"binary","example":"{wallet, usdc_balance, tx_30d, senders_30d, in_directory, verdict}"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_TRxu5uev1dps4r0FQNCu7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Performs on-demand due-diligence on a single x402 seller wallet, returning live USDC balance, 30-day settlement stats, directory presence, DNS reachability, and a machine-readable allowlist verdict.","exampleAgentPrompt":"Before I add 0xAbc123... to my x402 payment allowlist, can you run a due-diligence check on that seller wallet and tell me whether it comes back as ADD_TO_ALLOWLIST, REVIEW, or NO_PRINCIPAL — including their live USDC balance and 30-day settlement stats?","exampleUseCases":[{"title":"Onboarding seller to buyer allowlist","prompt":"I'm about to onboard a new x402 API seller at wallet 0xDeF456... into my automated payment flow — can you run the seller lookup and tell me if their verdict is ADD_TO_ALLOWLIST or if I should hold off?"},{"title":"Vetting unfamiliar payment endpoint","prompt":"I found a new x402 service I want to use but I don't know if the seller is legit — can you check wallet 0x789Abc... for their USDC balance, how many transactions they've settled in the last 30 days, and what the due-diligence verdict is?"},{"title":"Periodic allowlist hygiene check","prompt":"Can you re-verify seller wallet 0x111Bbb... that's already on my allowlist — I want to confirm their PayAI directory listing is still active, their DNS is reachable, and the verdict hasn't changed to REVIEW or NO_PRINCIPAL?"}],"resultDescription":"Returns a JSON object containing the seller's live Base USDC balance, 30-day transaction count (tx_30d), number of unique senders in 30 days (senders_30d), address activity metrics, PayAI directory entries and domains, public DNS reachability status, and a machine-readable verdict string of ADD_TO_ALLOWLIST, REVIEW, or NO_PRINCIPAL.","failureModes":["Invalid or malformed wallet address returns an error or empty result","Wallet address not found on Base chain returns zero balance and NO_PRINCIPAL verdict","DNS lookup timeout causes reachability field to be null or unresolvable","Payment of 0.001 USDC not processed results in 402 response before data is returned","Missing required 'format' query parameter may return a schema validation error"],"whenToPreferThis":"Choose this endpoint when you need a single, consolidated due-diligence snapshot on a specific x402 seller wallet before adding them to a buyer allowlist or OAP flow — especially when you need both on-chain settlement attestation and off-chain directory/DNS signals combined into one machine-readable verdict. Prefer it over generic blockchain explorers when you need x402-specific context (PayAI directory, conformance signals) and a ready-to-act verdict rather than raw chain data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T06:40:15.674Z","isFirstParty":false,"canonicalSlug":"x402-seller-lookup-5cb2d723"}