{"uid":"cap_FZ6ZMCBmjOcywSO7Lu9FI","slug":"x402-paywall-health-checker-forgemesh-fb4655c0","name":"x402 Paywall Health Checker — ForgeMesh","description":"x402 utility APIs for AI agents: documents/OCR, PDFs, vision, audio, embeddings, web extraction, dictionary and slang lookups, games, chess/legal-move logic, math, conversions, time utilities, market and economic data, space/geo data, domain vetting, content-signal checks, and x402 ecosystem intelligence. Agents POST JSON, receive a 402 challenge, pay USDC on Base, and retry for the result.","url":"https://x402.forgemesh.io/x402-paywall-check","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","description":"x402 endpoint URL to health-check, e.g. https://x402.example.com/some-route"}}},"responseSchema":{"type":"json","example":{"url":"https://library.forgemesh.io/business-management","grade":"A","is_402":true,"findings":["Valid x402 v2 envelope found in the header.","WWW-Authenticate: Payment header also present — this endpoint speaks both x402 and MPP dual-stack, reaching agents on either payment stack."],"reachable":true,"http_status":402,"method_used":"GET","x402_envelope":"header","envelope_valid":true,"mpp_dual_stack":true,"accepts_summary":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x85df5380DEbe236AD6BF49dE788243924B080267","amount":"3000","scheme":"exact","network":"eip155:8453"}],"envelope_errors":[],"response_time_ms":214}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_s279ezeYwyLIUhdtQ5Cda","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","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 URL is a valid, reachable x402 payment-gated endpoint and reports its payment envelope, HTTP status, accepted assets, and dual-stack compatibility.","exampleAgentPrompt":"Can you health-check the x402 endpoint at https://x402.example.com/some-route and tell me whether it has a valid payment envelope, what grade it gets, and which assets it accepts?","exampleUseCases":[{"title":"Debug misconfigured x402 paywall","prompt":"I just deployed my API at https://myapi.example.com/premium-data and I think the x402 paywall isn't set up right — can you probe it and tell me what the envelope looks like and whether it passes validation?"},{"title":"Audit third-party x402 endpoint before integration","prompt":"Before I integrate with https://data.thirdparty.io/market-feed in my agent, can you check if it's a properly reachable x402 endpoint, what grade it gets, and whether it accepts USDC on Base?"},{"title":"Check dual-stack MPP compatibility","prompt":"Can you inspect https://api.someservice.io/payments to see if it supports both x402 and MPP dual-stack, and let me know its reachability and response time?"}],"resultDescription":"A JSON object with a letter grade (e.g. 'A'), reachability boolean, HTTP status code, x402 envelope location and validity, MPP dual-stack flag, list of accepted payment assets (asset address, payTo address, amount, scheme, network), response time in milliseconds, array of human-readable findings, and any envelope errors found.","failureModes":["URL is unreachable — reachable: false, http_status may be null or a non-402 code","No x402 envelope found — grade degraded, envelope_valid: false, findings list explains absence","Malformed x402 envelope — envelope_errors array populated with specific issues","URL is not a 402 endpoint at all — is_402: false, grade low","Network timeout — response_time_ms may be high or request may fail entirely","Invalid URL format in input — likely 4xx error from this API itself"],"whenToPreferThis":"Use this endpoint when you need to programmatically verify that an x402-gated URL is correctly configured, reachable, and compliant before integrating it into an agent workflow or marketplace listing. It is the right choice when you want a graded, structured audit of x402 envelope structure, dual-stack MPP support, and accepted payment assets — rather than simply making a payment attempt.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T19:02:14.530Z","isFirstParty":false}