{"uid":"cap_tK1swCDYFmDuBSiI-Bcpr","slug":"561-group-market-reading-knowledge-join-04f2ee6d","name":"561 Group Market: Reading Knowledge Join","description":"Machine-payable x402 offers and books: software pays per request in USDC on Base over HTTP 402, with no account or API key.","url":"https://market.561.group/v1/four/reading-knowledge-join?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":null,"responseSchema":{"type":"json","example":"contested"},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_p9lZGIC-uy4qxoGLt5cRP","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Joins reading and knowledge records via a machine-payable HTTP 402 endpoint, returning structured JSON results paid per-request in USDC on Base.","exampleAgentPrompt":"Look up the knowledge record joined with my reading entry and give me the combined structured result — I'll pay per request in USDC on Base via x402, no API key needed.","exampleUseCases":[{"title":"Reading metadata knowledge enrichment","prompt":"Take my reading record ID and join it with the knowledge base to get back the enriched combined record — I need the full structured JSON with both reading and knowledge fields merged."},{"title":"Automated knowledge lookup per reading item","prompt":"For each reading item in my list, fetch the joined knowledge record from the 561 Group market endpoint and return the structured results, paying per call in USDC."},{"title":"Knowledge graph association retrieval","prompt":"I have a reading entry and I want to see what knowledge records are associated with it — can you pull the joined result from the 561 Group market and show me what comes back?"}],"resultDescription":"A structured JSON object containing the joined reading and knowledge record data. The exact schema is labeled 'contested' indicating dynamic or variable output structure depending on the input parameters provided.","failureModes":["Payment failure: insufficient USDC balance on Base causes HTTP 402 rejection","Invalid join parameters: malformed or missing input fields return an error","No matching record: the reading or knowledge identifier does not exist, returning empty or null result","Network timeout: Base network congestion delays payment confirmation","Schema mismatch: response structure varies (contested schema) and may not match expected fields"],"whenToPreferThis":"Choose this endpoint when you need a per-request, accountless, keyless lookup that joins reading and knowledge records, and you are able to pay $0.001 USDC per call on Base via the x402 protocol. Prefer this over traditional API-key services when building autonomous agents that need frictionless micropayment-based access without credential management.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:30:20.437Z","isFirstParty":false,"canonicalSlug":"561-group-market-reading-knowledge-join-04f2ee6d"}