{"uid":"cap_jLXWpB9_3DrRohbLSd1XJ","slug":"provenpaid-x402-endpoint-trust-check-07f89047","name":"ProvenPaid x402 Endpoint Trust Check","description":"Call before paying an unfamiliar x402 endpoint to see whether anyone actually pays it. Pass ?url=<endpoint URL>. ProvenPaid reads public Base data for the endpoint's receiving address: distinct payers, x402-style payments, repeat-payer share, payer concentration and coverage over 30 days. It also validates the x402 challenge (v1/v2; MPP detected) without paying. Each item has source and timestamp. Evidence, not a verdict. Not charged for invalid or unsafe URLs.","url":"https://api.provenpaid.com/v1/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"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","maxLength":2048,"description":"Public http(s) URL of the paid agent endpoint to check (x402 or MPP)."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"url":"https://api.example.com/paid-endpoint","probe":{"rails":["x402:v2"],"valid":true,"status":402,"challenge":{"offers":[{"pay_to":"0x1111111111111111111111111111111111111111","scheme":"exact","network":"eip155:8453","amount_atomic":10000}],"version":2}},"onchain":[{"pay_to":"0x1111111111111111111111111111111111111111","status":"ok","network":"eip155:8453","coverage":{"complete":true,"fraction":1},"x402_style":{"transfers":120,"distinct_payers":14,"top1_payer_share":0.3,"median_amount_usdc":0.01,"repeat_payer_share":0.5},"all_usdc_in":{"transfers":131,"distinct_payers":17},"excluded_payers":0}],"checked_at":1791331200,"methodology":"/methodology","payer_depth":[{"pay_to":"0x1111111111111111111111111111111111111111","network":"eip155:8453","statement":"14 distinct payers made 120 x402-style USDC payments to this receiving address in the last 30 days.","window_days":30,"x402_payments":120,"top1_payer_share":0.3,"coverage_complete":true,"coverage_fraction":1,"repeat_payer_share":0.5,"x402_distinct_payers":14}]}},"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":"unknown","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_Y5fjUkjvuqeVfe64CQERS","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":"Checks whether a given x402 payment endpoint has real payment history on Base before you pay it, returning payer stats, x402 challenge validation, and on-chain evidence.","exampleAgentPrompt":"Before I pay that endpoint at https://api.someagent.com/v1/answer, can you check ProvenPaid to see if it has real payment history on Base — how many distinct payers, whether there are repeat payers, and whether the x402 challenge actually validates?","exampleUseCases":[{"title":"Vet unknown paid agent before calling","prompt":"I found an x402 endpoint at https://api.strangeagent.com/v1/search that costs $0.05 per call — can you check if real people have actually paid it on Base before I send any money?"},{"title":"Detect scam or honeypot API listing","prompt":"This API listing at https://api.suspicious-tools.io/v1/run looks sketchy — can you pull its x402 payment history and payer stats from ProvenPaid to see if it's ever had legitimate traffic?"},{"title":"Evaluate payer concentration before integration","prompt":"We're thinking of integrating https://api.partnerservice.xyz/v1/data into our agent — can you check ProvenPaid for its 30-day payer coverage, repeat-payer share, and whether the x402 challenge validates cleanly?"}],"resultDescription":"Returns on-chain evidence items from Base about the endpoint's receiving address: number of distinct payers, count of x402-style payments, share of repeat payers, payer concentration metrics, and 30-day coverage window. Also returns whether the x402 challenge (v1/v2, including MPP) validates successfully without making a payment. Each evidence item includes its source and timestamp. Does not return a pass/fail verdict — provides raw evidence for the caller to interpret.","failureModes":["Invalid or malformed URL returns no charge and an error response","Unsafe URLs (private IPs, localhost, etc.) are rejected without charge","Endpoint receiving address has no on-chain history — returns empty evidence set","x402 challenge validation fails if endpoint is unreachable or misconfigured","Network or Base RPC errors may cause partial data or timeout"],"whenToPreferThis":"Use this endpoint when an AI agent or developer needs to assess whether an unfamiliar x402-gated API has been legitimately used before committing a payment. It is the right choice when you want on-chain payer evidence, x402 challenge validation, and payer behavior metrics (concentration, repeat rate) from Base without executing a financial transaction. Prefer it over blind trust or manual blockchain exploration when evaluating third-party paid agent endpoints in an autonomous workflow.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T21:38:36.443Z","isFirstParty":false,"canonicalSlug":"provenpaid-x402-endpoint-trust-check-07f89047"}