{"id":"eefa4720-d37c-4606-8408-87c4eaf16491","shortId":"Gmr3pZ","kind":"mpp","title":"AI-generated answers with web citations via Exa, pay-per-request at $0.01","tagline":"AI-generated answers with web citations via Exa, pay-per-request at $0.01","description":"The Exa Answer endpoint on StableEnrich returns AI-generated answers to natural language questions, grounded in live web search results and accompanied by source citations. It is a POST endpoint at `https://stableenrich.dev/api/exa/answer` that accepts a JSON body with a required `query` string and optional `stream` and `text` boolean flags. The response includes an `answer` string, an array of `citations` (each with URL, title, author, published date, and optionally extracted text), and a `costDollars` object.\n\nThis endpoint is part of the StableEnrich platform, which unifies multiple premium data APIs (Exa, Apollo, Firecrawl, Google Maps, Serper, Whitepages, Clado, Minerva, Reddit, Hunter, Influencer, Cloudflare) behind a single micropayment interface. No API keys or subscriptions are required — authentication is handled via HTTP 402 micropayment using x402 or MPP (Tempo method with pathUSD on Tempo L2). The fixed price is $0.01 per request. Payments can be made on Base mainnet (eip155:8453), Solana, or Tempo.\n\nThe endpoint is designed for agent workflows using the agentcash MCP server or CLI, which automates payment processing. Agents discover endpoints via `discover_api_endpoints`, check schemas with `check_endpoint_schema`, and execute calls with `fetch`. The Exa Answer endpoint is useful when an agent needs a concise, cited answer to a factual question without manually parsing search results.","tags":["apollo","exa","firecrawl","google-maps","linkedin","reddit","enrichment","research"],"capabilities":["ai-answer-generation","web-search-grounded","citation-extraction","pay-per-request","micropayment-auth","x402-protocol","mpp-tempo-settlement","streaming-response","no-api-key-required"],"categories":["search","llm"],"synonyms":["exa answer","AI web answer","cited answer API","question answering API","web QA","search answer","grounded answer","RAG answer endpoint","exa AI search"],"warnings":["Probe returned 405 on HEAD and GET — endpoint is POST-only, which is expected and documented in the OpenAPI spec","No direct 402 challenge was captured for this endpoint; liveness inferred from OpenAPI spec and platform documentation"],"endpointUrl":"https://stableenrich.dev/api/exa/answer","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stableenrich.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.920","qualityRationale":"Full OpenAPI 3.1 schema with request/response definitions, clear pricing ($0.01/request in USD), detailed guidance documentation, and example request bodies are all present. The endpoint returned 405 on HEAD/GET probes (expected since it is POST-only), but the OpenAPI spec and pricing table confirm it is live. Minor deduction because no actual 402 challenge was captured for this specific 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'mcp':194 'method':159 'micropay':138,153 'micropayment-auth' 'minerva':130 'mpp':157 'mpp-tempo-settlement' 'multipl':118 'natur':43 'need':229 'no-api-key-required' 'object':107 'option':77,101 'pars':240 'part':111 'pathusd':161 'pay':11,26 'pay-per-request':10,25 'payment':172,200 'per':12,27,170 'platform':115 'post':60 'premium':119 'price':167 'process':201 'publish':98 'queri':74 'question':45,237 'question answering API' 'reddit':131 'request':13,28,171 'requir':73,146 'respons':84 'result':51,242 'return':37 'schema':210,214 'search':50,241 'search answer' 'serper':127 'server':195 'singl':137 'solana':181 'sourc':55 'stableenrich':36,114 'stableenrich.dev':64 'stableenrich.dev/api/exa/answer':63 'stream':78 'streaming-response' 'string':75,88 'subscript':144 'tempo':158,163,183 'text':80,103 'titl':96 'unifi':117 'url':95 'use':154,191,225 'via':8,23,150,205 'web':6,21,49 'web QA' 'web-search-grounded' 'whitepag':128 'without':238 'workflow':190 'x402':155 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It has been the capital since the 10th century and is the country's largest city.","citations":[{"id":"abc123","url":"https://en.wikipedia.org/wiki/Paris","text":"Paris is the capital and most populous city of France...","title":"Paris - Wikipedia","author":null,"publishedDate":null}],"costDollars":{"total":0.01}},"schema":{"path":"/api/exa/answer","method":"POST","payment":{"amount":"10000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"AI-generated answers with citations"},"description":"AI-generated answers with citations"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Exa Answer endpoint price is $0.01 per request","source_url":"https://stableenrich.dev"},{"claim":"Endpoint accepts POST with required query field and optional stream/text booleans","source_url":"https://stableenrich.dev/api/exa/answer"},{"claim":"Payments processed on Base mainnet, Solana, or Tempo via x402/MPP","source_url":"https://stableenrich.dev/docs"},{"claim":"Response includes answer string, citations array, and costDollars object","source_url":"https://stableenrich.dev"},{"claim":"No API keys or subscriptions required — payment is authentication","source_url":"https://stableenrich.dev/docs"}],"useCases":["Agent asks a factual question and needs a concise answer with source URLs","Automated research pipelines that need cited summaries of web knowledge","Building RAG-style workflows where web search provides grounding for LLM answers","Quick fact-checking with traceable citations","Replacing manual search-then-summarize steps in agent toolchains"],"bestFor":["AI agents needing cited answers to factual questions without parsing raw search results","Pay-as-you-go research workflows with no subscription commitment","Developers integrating web-grounded QA into agent pipelines via MCP/x402"],"notFor":["High-volume batch QA where per-request costs add up (consider direct Exa API subscription)","Use cases requiring real-time streaming chat (stream flag exists but endpoint is request-response oriented)","Queries requiring private or proprietary data not indexed on the public web"],"kindDetails":{"docs":{"llmsTxt":"https://stableenrich.dev/llms.txt","homepage":"https://stableenrich.dev"},"tags":["apollo","exa","firecrawl","google-maps","linkedin","reddit","enrichment","research"],"realm":"stableenrich.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stableenrich.dev","name":"Merit Systems"},"categories":["data","search","social"],"service_id":"stableenrich","integration":"first-party","service_name":"StableEnrich","service_description":"Pay-per-request research APIs — people, companies, web search, scraping, places, social media, and contact enrichment."},"updatedAt":"2026-04-22T02:45:06.405Z"}}