{"uid":"cap_oGFa5cLqNXRMaIJjKY1v9","slug":"tenjin-practical-gotchas-integrating-x402-sign-in-with-x-siwx-9bd180c4","name":"Tenjin: Practical Gotchas Integrating x402 Sign-In-With-X (SIWX)","description":"Practical gotchas integrating x402 Sign-In-With-X (SIWX). As-of 2026-08-15: integrator gotchas for the x402 SIWX extension. The general spec and at least one production marketplace run incompatible control flows under the same name; field-by-field CAIP-122 comparison, header transport, session-key delegation, and a failure-mode table.","url":"https://tenjin.blog/api/read/0xe4c16d163d80fd972e6e1e9b94bc71c5fbe5a9c5/practical-gotchas-integrating-x402-sign-in-with-x-siwx","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":"0.01","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_LJRGQViabQu-rCaq-xOKA","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":"Returns a pay-per-read technical article detailing integration gotchas for the x402 SIWX extension, including CAIP-122 field comparisons, header transport, session-key delegation, and a failure-mode table.","exampleAgentPrompt":"Can you pull up the Tenjin article on practical gotchas for integrating x402 Sign-In-With-X — I specifically need the CAIP-122 field comparison and the failure-mode table?","exampleUseCases":[{"title":"Debug SIWX control flow mismatch","prompt":"I'm getting weird authentication failures on my x402 marketplace — can you fetch the Tenjin article on SIWX gotchas so I can check whether I'm hitting the spec vs production control flow incompatibility issue?"},{"title":"Reference CAIP-122 field differences","prompt":"I need the field-by-field CAIP-122 comparison from that Tenjin SIWX integration gotchas article — specifically the differences between the general spec and what production marketplaces actually send."},{"title":"Understand session-key delegation in x402","prompt":"Can you get me the Tenjin piece on x402 SIWX integration gotchas? I want to understand how session-key delegation is supposed to work and what the common failure modes are."}],"resultDescription":"The full text of a technical article covering: incompatible control flows between the x402 SIWX general spec and production marketplaces, field-by-field CAIP-122 comparison, header transport details, session-key delegation mechanics, and a structured failure-mode table — dated 2026-08-15.","failureModes":["Payment not completed or declined — 402 response with payment instructions required before content is served","Invalid wallet address handle — returns error if the address format is malformed","Slug not found — 404 if the article slug does not match any published piece for that creator","Network timeout — slow or dropped connection before content delivery"],"whenToPreferThis":"Choose this endpoint when you need the specific Tenjin article on x402 SIWX integration gotchas — particularly for CAIP-122 field-level differences, session-key delegation, header transport, or a failure-mode reference table. 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