{"uid":"cap_CFlKZTJ356_2QzirofERV","slug":"x402-seller-legitimacy-check-3f22c6ea","name":"x402 Seller Legitimacy Check","description":"Is this x402 seller real? Pass ?seller= with a host (api.example.com) or a payTo address (0x...). From Coinbase's own Bazaar counts (re-read every 6 hours) we return its listings, 30-day payers and calls, and the one number that separates customers from a test harness: how many times the average payer came back. For an Arc payTo we add its settlements from our full Arc x402 index: distinct payers and the top payer's share.","url":"https://apexfaucet.xyz/api/x402/x402-seller-check?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","queryParams"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["seller"],"properties":{"seller":{"type":"string","description":"A seller host (api.example.com) or a payTo address (0x...)."}}}}},"output":{"type":"object"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_gNbITHegPjhrXfyw48WHw","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether an x402 seller is real by returning its Bazaar listing count, 30-day payer and call statistics, average payer return rate, and Arc settlement data for a given host or payTo address.","exampleAgentPrompt":"Can you check whether api.example.com is a real x402 seller — I want to know if it has genuine paying customers or if it looks like a test harness, including how often their average payer comes back?","exampleUseCases":[{"title":"Vetting an x402 API before integrating","prompt":"Before I start using this x402 API at api.someservice.com, can you check if it's a real seller with actual paying users or just a test setup? I want to see its 30-day payer count and how often customers return."},{"title":"Checking an Arc payTo address for genuine activity","prompt":"I have a payTo address 0xAbCd1234... from an x402 marketplace listing — can you look it up and tell me how many distinct payers it has on Arc and what share the top payer holds?"},{"title":"Evaluating a Bazaar-listed seller's commercial traction","prompt":"I found an x402 seller on Bazaar at api.coolprovider.xyz — can you pull its listing stats, 30-day call volume, and payer return rate so I can judge whether it has real commercial traction?"}],"resultDescription":"Returns the seller's Bazaar listing count, 30-day unique payer count, 30-day call count, and average payer return frequency (the key signal distinguishing real customers from a test harness). For Arc payTo addresses, also returns the number of distinct Arc payers and the top payer's share of total settlements. Data is refreshed from Coinbase's Bazaar every 6 hours.","failureModes":["Missing 'seller' query parameter returns an error","Unknown host or address with no Bazaar or Arc data may return empty/null statistics","Stale data if queried within 6 hours of a seller's first appearance on Bazaar","Invalid payTo address format may return an error or no Arc results","Rate limiting or payment failure if USDC payment is not attached"],"whenToPreferThis":"Use this endpoint when you need to assess whether an x402 seller has genuine commercial activity versus being a demo or test harness, particularly before integrating or paying an x402 API. It is uniquely valuable for cross-referencing both Bazaar listing data and Arc on-chain settlement history in a single call, with the payer return rate metric being especially diagnostic.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T01:27:24.968Z","isFirstParty":false,"canonicalSlug":"x402-seller-legitimacy-check-3f22c6ea"}