{"uid":"cap_c7AkhOTVghRbaVAnIkZjp","slug":"tenjin-knowledge-marketplace-preserve-http-402-payment-terms-in-c1bc0b81","name":"Tenjin Knowledge Marketplace – Preserve HTTP 402 Payment Terms in LangChain Tools for Agent Souk","description":"Tenjin is a knowledge marketplace for AI agents: buy verified answers and tested research, each finding on its own. Creators earn as their knowledge is used.","url":"https://tenjin.sh/api/read/0xe4f7077f75438e2d63a6112b854f1e666dc74f1b/preserve-http-402-payment-terms-in-langchain-tools-for-agent-souk","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"required":{"type":"string"},"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"id":"019f5e1d-3c0e-7b8d-824f-785faafd7bea","url":"https://tenjin.sh/a/athoughts/x402-batch-settlement-how-the-protocol-s-payment-channel-voucher-scheme-actually","slug":"x402-batch-settlement-how-the-protocol-s-payment-channel-voucher-scheme-actually","tags":["x402","protocol","batch-settlement","payment-channels","metering"],"price":"100000","title":"x402 batch settlement: how the protocol's payment-channel/voucher scheme actually works","creator":{"handle":"athoughts","displayName":"athoughts"},"excerpt":"A from-the-spec explainer of x402's batch-settlement scheme (a stateless unidirectional payment channel with cumulative signed vouchers) for anyone building a metered or streaming x402 service and deciding between exact and batch. Cadence knobs, the escrow deposit flow, and the facilitator-support gotcha. As-of 2026-07-13.","publishedAt":"2026-07-14T00:53:22.064Z"}},"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_JHgeyR6-GRyhn0QdWdnlt","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":"Retrieves a verified, pre-researched knowledge article explaining how to preserve HTTP 402 payment terms when building LangChain tools for use in agent marketplaces.","exampleAgentPrompt":"Can you fetch the Tenjin article on how to preserve HTTP 402 payment terms in LangChain tools for Agent Souk? I want the verified research on how to wire up x402 payment handling correctly in a LangChain tool.","exampleUseCases":[{"title":"LangChain x402 integration research","prompt":"I'm building a LangChain agent that needs to call paid x402 APIs — can you pull up the Tenjin article about how to preserve HTTP 402 payment terms in LangChain tools so I know exactly how to structure my tool definitions?"},{"title":"Agent marketplace tool compliance check","prompt":"Before I publish my tool to Agent Souk, I want to make sure I'm handling x402 payment headers correctly — grab me the Tenjin research piece on preserving 402 payment terms in LangChain tools."},{"title":"Onboarding team to x402 LangChain patterns","prompt":"I need to share a reliable, tested reference with my team on how x402 payment terms work inside LangChain tools — can you retrieve that verified Tenjin article on the topic for me?"}],"resultDescription":"Returns a JSON object containing the article's unique ID, canonical URL, slug, tags (e.g. x402, langchain, agent-souk), price in micro-units, full title, creator handle and display name, a plain-language excerpt summarizing the key findings, and the publication timestamp.","failureModes":["Payment not fulfilled (402): the caller has not paid the $0.05 USDC fee, no content returned","Article not found (404): the slug or wallet address in the path is invalid or the article has been removed","Facilitator unavailable: the x402 payment facilitator is down, blocking access","Network timeout: the endpoint does not respond within expected latency window","Malformed request: incorrect URL path structure results in a routing error"],"whenToPreferThis":"Choose this endpoint when you need a single, verified, human-authored research article on the specific topic of preserving HTTP 402 payment terms in LangChain tool construction for agent marketplaces. Prefer it over generic web search when you want a tested, citable answer rather than raw search results, and when you are operating in an x402-capable agent context that can handle microtransaction gating automatically.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:39:12.576Z","isFirstParty":false}