{"uid":"cap_i-qtq7Udau2wJe4nYjGON","slug":"synapse-rerank-5d922bdc","name":"Synapse Rerank","description":"Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.","url":"https://anibalb.duckdns.org/x402/rerank?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"documents":{"type":"string"}}},"responseSchema":{"type":"json","example":{"results":[{"index":0,"relevance_score":0.9}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_RNJF4rXWqFdBnS9Ao2DxE","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Reranks a list of documents by relevance score given a query, returning ordered results with confidence scores.","exampleAgentPrompt":"Rerank these five passages by how relevant they are to the question 'What are the side effects of ibuprofen?' and give me back their relevance scores: [passage1, passage2, passage3, passage4, passage5].","exampleUseCases":[{"title":"RAG pipeline result reranking","prompt":"I retrieved 10 chunks from my vector database for the query 'climate change impacts on agriculture' — can you rerank them by relevance and return the top 3 most relevant ones with their scores?"},{"title":"Search engine result ordering","prompt":"I have a list of 20 product descriptions and a user searched for 'lightweight waterproof hiking boots' — rerank these descriptions so the most relevant ones appear first."},{"title":"QA candidate passage selection","prompt":"Given the question 'How does photosynthesis work?', rank these 8 text passages by how well they answer it and tell me the relevance score for each."}],"resultDescription":"A JSON array of result objects, each containing the original document index and a relevance_score between 0 and 1, sorted from most to least relevant. Agents can use these scores to reorder or filter their document set.","failureModes":["Empty or malformed documents parameter returns an error","Documents string exceeds length limits causing rejection","Network timeout on large document sets","Payment failure via x402 if USDC balance is insufficient","Malformed JSON in response if service is temporarily degraded"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call reranker with no account setup, especially in RAG pipelines where you want to rescore retrieved chunks before presenting them to a language model. Prefer it over self-hosted rerankers when you want zero infrastructure overhead and micro-transaction pricing in USDC.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:55.374Z","isFirstParty":false,"canonicalSlug":"synapse-rerank-5d922bdc"}