{"uid":"cap_VycFw97nl7PJ8FSeAnidy","slug":"tenjin-x402-endpoint-failure-modes-article-8d7052ae","name":"Tenjin – x402 Endpoint Failure Modes Article","description":"Running a Paid x402 Endpoint on 2026-08-08: The Failure Modes, Measured Against the Live Registry and Catalog. Almost everything written about x402 is written for the buyer: how an agent pays, which wallet to give it, how not to get it drained. This is the other side. You have a paid HTTP endpoint, agents are supposed to discover it and buy from it, and the question is what actually breaks. As of 2026-08-08. Every SDK claim below names a version, every spec claim names a document, and the two datasets are first-party: a census of the ERC-8004 Identity Registry on Base taken at block 49,706,971, and a com","url":"https://tenjin.blog/api/read/agent-rails/running-a-paid-x402-endpoint-on-2026-08-08-the-failure-modes-measured-against-th?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"],"type":"string"},"pathParams":{"type":"object","required":["handle","slug"],"properties":{"slug":{"type":"string","description":"The article's URL slug, unique per creator. The reserved slug `latest` resolves to the creator's newest published piece; its stable scheduled-read form is the wallet-address URL /api/read/<0x-address>/latest (a handle `latest` is not payable)."},"handle":{"type":"string","description":"The creator's handle, or their wallet address. The address form is REQUIRED for a durable `latest` alias (a handle `latest` is not payable), and is the only form for an unclaimed creator."}}},"queryParams":{"type":"object","required":[],"properties":{},"additionalProperties":false}},"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_2Y09dVzimQkCI--dvc3pv","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":"Retrieves the full text of a paid article analyzing real-world failure modes when running a paid x402 HTTP endpoint, measured against the live ERC-8004 registry and catalog as of 2026-08-08","exampleAgentPrompt":"Fetch me the full Tenjin article about failure modes when running a paid x402 endpoint — the one published 2026-08-08 that covers the ERC-8004 registry census and live catalog data — using the handle 'agent-rails' and slug 'running-a-paid-x402-endpoint-on-2026-08-08-the-failure-modes-measured-against-th'.","exampleUseCases":[{"title":"Research x402 payment protocol pitfalls","prompt":"Get me the full text of that Tenjin piece on what actually breaks when you run a paid x402 endpoint — the one from August 8th 2026 by agent-rails — I want to understand the failure modes before I ship my own monetized API."},{"title":"Audit ERC-8004 registry findings","prompt":"Pull the complete Tenjin article by agent-rails about the ERC-8004 Identity Registry census taken at block 49,706,971 — I need the first-party dataset details on the registry and catalog."},{"title":"Study x402 SDK version-specific bugs","prompt":"Fetch the full Tenjin article from the agent-rails creator with the slug about x402 endpoint failure modes measured against the live registry — I need to review which SDK versions they named and what spec claims they made."}],"resultDescription":"A JSON object containing the full text and metadata of the article 'Running a Paid x402 Endpoint on 2026-08-08: The Failure Modes, Measured Against the Live Registry and Catalog', including analysis of x402 SDK failure modes, ERC-8004 identity registry census data from Base at block 49,706,971, and catalog measurements — returned after payment of $0.10 USDC via x402 challenge.","failureModes":["Payment challenge not completed — returns 402 if the x402 payment is not submitted or is invalid","Invalid handle or slug — returns 404 if the creator handle or article slug does not exist","Slug 'latest' used with a handle instead of wallet address — not payable, returns error","Unclaimed creator accessed by handle instead of wallet address — only address form works for unclaimed creators","Network or chain RPC errors causing payment verification failure"],"whenToPreferThis":"Choose this endpoint when you specifically need the full text of this x402 failure-modes analysis article from Tenjin's agent-rails creator. It is the authoritative pay-per-read source for first-party x402 endpoint operator data including the ERC-8004 census and live catalog measurements. Prefer this over general web search when you need the complete, unpaywalled article content and have an x402-capable payment agent.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T19:22:56.747Z","isFirstParty":false,"canonicalSlug":"tenjin-x402-endpoint-failure-modes-article-8d7052ae"}