{"uid":"cap_jIJ0FLZFxK9xAP7e-BaX4","slug":"tenjin-x402-v2-vs-v1-discovery-vocabulary-changes-a472bd80","name":"Tenjin: x402 v2 vs v1 Discovery Vocabulary Changes","description":"x402 v2 vs v1: what changed in the discovery vocabulary on catalog surfaces. As-of 2026-08-15: what a discovery/catalog client must change between x402 v1 and v2 — the header renames, the challenge moving from response body to PAYMENT-REQUIRED header, CAIP-2 network naming, Bazaar query vocabulary, and measured data on x402Version fragmentation from an open spec issue.","url":"https://tenjin.blog/api/read/0xe4c16d163d80fd972e6e1e9b94bc71c5fbe5a9c5/x402-v2-vs-v1-what-changed-in-the-discovery-vocabulary-on-catalog-surfaces","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_zZaF_P47MNiVwF4JQUwPO","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 article detailing what changed between x402 v1 and v2 in the discovery vocabulary on catalog surfaces, including header renames, challenge format changes, CAIP-2 naming, and Bazaar query vocabulary.","exampleAgentPrompt":"Can you pull up the Tenjin article on what changed between x402 v1 and v2 — specifically the discovery vocabulary, header renames, and how the payment challenge moved to the PAYMENT-REQUIRED header?","exampleUseCases":[{"title":"x402 v2 migration for catalog client","prompt":"I'm updating my x402 catalog client from v1 to v2 — can you fetch that Tenjin article that covers exactly what header names changed, how the challenge format moved, and what the new Bazaar query vocabulary looks like?"},{"title":"Understanding CAIP-2 naming in x402 v2","prompt":"Pull up the Tenjin piece on x402 v2 vs v1 — I specifically need the section on how CAIP-2 network naming works in v2 and how it differs from v1."},{"title":"Diagnosing x402Version fragmentation issues","prompt":"I'm seeing x402Version fragmentation in production — fetch the Tenjin article on x402 v2 vs v1 discovery changes so I can understand the measured data from the open spec issue."}],"resultDescription":"The full text of a pay-per-read article (unlocked for $0.01 USDC) covering the differences between x402 v1 and v2 as of 2026-08-15: renamed headers, the payment challenge moving from response body to the PAYMENT-REQUIRED header, CAIP-2 network naming conventions, updated Bazaar query vocabulary, and empirical data on x402Version fragmentation from an open spec issue.","failureModes":["Payment not attached or insufficient — returns 402 Payment Required with challenge in PAYMENT-REQUIRED header","Invalid or mismatched wallet address handle — returns 404 Not Found","Slug not found for the given creator — returns 404 Not Found","Network or upstream error — returns 5xx","Using handle 'latest' without a wallet address (not payable) — may return error or wrong article"],"whenToPreferThis":"Choose this endpoint when you need authoritative, cited information about the x402 v2 specification changes for discovery/catalog clients, specifically covering header renames, challenge format migration, CAIP-2 naming, and Bazaar vocabulary — as a micropayment-gated article from an independent publisher rather than free documentation or a spec search.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T00:53:12.536Z","isFirstParty":false}