{"uid":"cap_HS2rOTt-410l6uj78mlg5","slug":"keyless-answer-api-0374ee1f","name":"Keyless Answer API","description":"Paid APIs with no signup. USDC on Base via x402.","url":"https://keyless-theta.vercel.app/answer?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"responseSchema":{"type":"json","example":{"model":"meta-llama/llama-3.3-70b-instruct","answer":"…","fetched":"2026-10-05T05:00:00Z","sources":[{"url":"https://…","title":"…"}],"question":"What is the x402 payment protocol?","price_usd":0.02}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_lkTZnPfJL1f5QVif6NjZb","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Answers a natural language question using a large language model with live web sources, billed per-query via x402 USDC micropayment on Base","exampleAgentPrompt":"What is the x402 payment protocol and how does it work? Just charge the $0.02 per-query fee and give me a sourced answer.","exampleUseCases":[{"title":"Quick factual research with citations","prompt":"Can you find out when the James Webb Space Telescope was launched and give me a few source links confirming it?"},{"title":"Crypto and Web3 topic lookup","prompt":"I need a sourced explanation of how Base network rollups work — just query Keyless and give me the answer with citations."},{"title":"Current events fact-check","prompt":"What is the latest status of the EU AI Act and when does it take effect? Get me a cited answer from live web sources."}],"resultDescription":"A JSON object containing: the model used (meta-llama/llama-3.3-70b-instruct), a natural language answer string, a fetch timestamp, the original question echoed back, the price paid ($0.02 USD), and an array of source objects each with a URL and title.","failureModes":["Payment not included or insufficient USDC — returns 402 Payment Required","Question parameter missing — returns 400 Bad Request","Inference provider unavailable — returns 503 or timeout","Web retrieval fails for question — answer may be based on model knowledge only with fewer sources","Malformed query string — returns 400 or empty answer"],"whenToPreferThis":"Choose this endpoint when you need a sourced, LLM-generated answer to a natural language question without any API key or account signup — ideal for agents that need quick, cited factual lookups and can handle x402 USDC micropayments on Base. Prefer it over generic search APIs when you want a synthesized prose answer with citations rather than raw search results, and over hosted LLM APIs when you want to avoid credential management and pay strictly per-query.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-16T06:32:55.748Z","isFirstParty":false,"canonicalSlug":"keyless-answer-api-0374ee1f"}