{"uid":"cap_uxbc5s-B7i5HdGKVfoEY6","slug":"aiskills402-x402-seller-diagnostics-f811a3be","name":"aiskills402 x402 Seller Diagnostics","description":"x402 Seller: Payable and Listed: Diagnoses why an HTTP API sold over x402 v2 cannot be paid by standard buyer agents or never appears in the Coinbase CDP Bazaar catalog, using an ordered checklist and a decision tree over the pasted 402 response, headers and symptoms. Names the exact field that is wrong or missing and how to prove the fix. Use when asked to check an x402 seller, fix an unpayable 402 endpoint, find out why a resource is not listed in Bazaar, or why a settled payment does not sho…","url":"https://api.aiskills402.com/v1/skills/x402-seller/file?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"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xo11YwWbXEjtulMb5gJxx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Diagnoses why an x402 v2 HTTP API endpoint cannot be paid by buyer agents or does not appear in the Coinbase CDP Bazaar catalog, identifying the exact misconfigured or missing field and how to verify the fix.","exampleAgentPrompt":"I've set up an x402 v2 endpoint but buyer agents can't pay it and it's not showing up in the Bazaar catalog — can you run a diagnostic on this 402 response and headers and tell me exactly which field is wrong and how to prove the fix?","exampleUseCases":[{"title":"Unpayable 402 endpoint debugging","prompt":"My API returns a 402 but every buyer agent I've tested says it can't pay it — here's the 402 response body and headers. Can you tell me exactly what field is misconfigured and what I need to change to make it payable?"},{"title":"Bazaar catalog listing failure","prompt":"I registered my x402 seller endpoint weeks ago but it still doesn't appear in the Coinbase CDP Bazaar catalog. Can you look at my 402 response and headers and diagnose why it's not being picked up or listed?"},{"title":"Settled payment not reflected","prompt":"A payment went through and settled on-chain for my x402 API, but the buyer's agent says the transaction never confirmed on our end. Can you run the x402 seller diagnostic on my response headers and tell me what's causing the disconnect?"}],"resultDescription":"A structured diagnostic report that identifies the exact field that is wrong or missing in the 402 response, HTTP headers, or seller configuration, explains why it causes the failure (unpayable endpoint or missing Bazaar listing), and provides specific steps to implement and verify the fix. The output follows an ordered checklist and decision tree format.","failureModes":["Incomplete or malformed 402 response body provided — diagnostic cannot pinpoint root cause","Headers not included in the input — partial diagnosis only covering response body","Non-x402 payment protocol symptoms provided — out of scope for this diagnostic","x402 v1 response format provided instead of v2 — may produce misleading results"],"whenToPreferThis":"Use this endpoint when you need to debug a specific x402 v2 seller configuration problem: an endpoint that buyer agents cannot pay, an API that does not appear in the Coinbase CDP Bazaar catalog, or a settled payment that is not being recognized. Prefer this over generic API debugging tools because it is specifically trained on x402 v2 protocol rules, Bazaar listing requirements, and the exact field-level validation logic that buyer agents and the CDP indexer enforce.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T12:46:25.705Z","isFirstParty":false,"canonicalSlug":"aiskills402-x402-seller-diagnostics-f811a3be"}