{"uid":"cap_u2cpRcA_VTrrw1g8fVEi7","slug":"agent402-tools-answer-ai-synthesized-answer-with-live-web-citations-6afed971","name":"agent402.tools Answer — AI-synthesized answer with live web citations","description":"A synthesized answer to a natural-language question, grounded in a live web search and returned with source citations (URL, snippet). Use it when an agent needs a direct, current answer plus the receipts to verify or follow up, instead of reading several pages itself.","url":"https://agent402.tools/api/answer?utm_source=zero.xyz","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"},"queryParams":{"type":"object","required":["q"],"properties":{"q":{"type":"string","description":"Natural-language question (max 400 chars)"},"country":{"type":"string","description":"Optional 2-letter country code (default us)"},"language":{"type":"string","description":"Optional 2-letter language code (default en)"},"max_tokens":{"type":"integer","description":"Optional cap on the generated answer length in tokens (default 1024, min 64, max 4096). Lower for TL;DR; higher for research questions."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["query","answer","citations","citationCount"],"properties":{"query":{"type":"string"},"answer":{"type":"string"},"citations":{"type":"array","items":{"type":"object","properties":{"url":{"type":"string"},"number":{"type":"integer"},"favicon":{"type":"string"},"snippet":{"type":"string"}}}},"citationCount":{"type":"integer"}}}}}}},"responseSchema":{"type":"json","example":{"query":"what is the x402 payment protocol?","answer":"x402 is an open standard for internet-native, pay-per-request HTTP APIs that uses the HTTP 402 \"Payment Required\" status code to negotiate and settle micro-payments inline with the original request.","citations":[{"url":"https://www.x402.org/","number":1,"favicon":"https://imgs.search.brave.com/...","snippet":"x402: An open standard for internet-native payments."}],"citationCount":1}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.08","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.08","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_WW8nRlnpi-0oeeJLxhwCf","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.08","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns an AI-generated prose answer to a natural-language question, grounded in live web search results, along with a structured citations array (URL, snippet, favicon).","exampleAgentPrompt":"What are the latest developments in the EU AI Act as of this week — give me a clear summary with sources I can check?","exampleUseCases":null,"resultDescription":"A clean prose answer synthesized from live web search results, plus a structured citations array containing the source URL, a relevant snippet, and a favicon for each source used — grounded in real-time web data rather than the model's training knowledge.","failureModes":["Question exceeds 400 characters — truncate or rephrase","No live web results found for the query — returns empty citations or degraded answer","Invalid country or language code — falls back to defaults (us/en)","max_tokens set below minimum of 64 — rejected with validation error","Payment of 0.03 USDC not completed — 402 Payment Required response","Search index temporarily unavailable — 503 or timeout error"],"whenToPreferThis":"Choose this endpoint when you need a synthesized, human-readable answer to a factual or research question AND want verifiable source citations — especially when the question requires current information beyond training data. Prefer this over a raw search endpoint when you want the model to synthesize results into prose rather than just returning a list of links. Prefer this over a general LLM when you need live grounding and source receipts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-09T18:34:40.091Z","isFirstParty":false,"canonicalSlug":"agent402-tools-answer-ai-synthesized-answer-with-live-web-citations-6afed971"}