{"id":"8ba7e6ad-c5f6-4ffb-8173-8b2336ec7313","shortId":"rKYxYE","kind":"mpp","title":"Exa-powered neural web search at $0.01/request via micropayment — no API keys needed.","tagline":"Exa-powered neural web search at $0.01/request via micropayment — no API keys needed.","description":"This endpoint provides semantic (neural) web search powered by Exa, proxied through StableEnrich's pay-per-request gateway. Send a natural-language query and receive ranked web results with titles, URLs, published dates, relevance scores, and optional inline content (text, highlights, summaries). An optional `category` parameter filters results by content type — including company pages, research papers, news, GitHub repos, tweets, LinkedIn profiles, PDFs, and financial reports.\n\nThe endpoint accepts POST requests with a JSON body. The only required field is `query` (string). Optional parameters include `numResults` (1–100, default 5), `type` (neural, fast, auto, deep), `category`, domain include/exclude lists, date range filters, `includeText`/`excludeText` arrays, and a `contents` object for requesting inline text extraction, highlights, summaries, livecrawl, and subpage expansion. Pagination is handled via `numResults`.\n\nPricing is $0.01 USD per request, settled via x402 or MPP (Tempo method, pathUSD currency) on each call. No API key or subscription is required — payment is authentication. The endpoint is part of StableEnrich, a unified research API suite by Merit Systems that bundles Exa, Apollo, Firecrawl, Google Maps, Serper, Whitepages, Clado, Minerva, Reddit, Hunter, Influencer, and Cloudflare crawl endpoints behind a single micropayment interface. Payments settle on Base mainnet (EIP-155:8453), Solana, or Tempo.","tags":["apollo","exa","firecrawl","google-maps","linkedin","reddit","enrichment","research"],"capabilities":["neural-web-search","semantic-search","category-filtering","date-range-filtering","domain-filtering","content-extraction","text-highlights","ai-summary","livecrawl","subpage-expansion","linkedin-profile-search","micropayment-auth","x402","mpp-tempo"],"categories":["search","enrichment"],"synonyms":["exa search","neural search","semantic web search","AI web search","web research API","Exa API proxy","pay-per-search","agent web search","natural language search"],"warnings":["Probe returned 405 because HEAD/GET were tried on a POST-only endpoint; the endpoint is live per the OpenAPI spec and root page (200 status).","No direct 402 challenge was captured in the probe bundle, but payment info is fully specified in the OpenAPI x-payment-info block."],"endpointUrl":"https://stableenrich.dev/api/exa/search","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 detailed request/response definitions, clear pricing ($0.01/request in USD), comprehensive guidance documentation, and multiple documented examples. The endpoint returned 405 on HEAD/GET probes because it only accepts POST, which is expected behavior — the OpenAPI spec confirms POST as the method. The 402 challenge was not directly captured but the x-payment-info block and full MPP protocol details are present in the 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