{"uid":"cap_TOA9hrcNjfpY0xSCakEQY","slug":"firstmention-websearch-58d7af55","name":"firstmention websearch","description":"Pay-per-call HTTP APIs, paid with x402 in USDC on Base (eip155:8453): agentkit, api-change-check, basedue, basewatch, chainread, check-sanctions, chgwatch, company-facts, composite, edgar, feednews, pageaudit, solcheck, token-dd, txpreflight, walletcheck, webmd, webread, websearch, x402index. Each operation describes its service.","url":"https://api.firstmention.uk/s/websearch/brief?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","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":[],"properties":{"q":{"type":"string","description":"Search query"},"url":{"type":"string","description":"Direct page URL (alternative to q) to extract"},"chars":{"type":"integer","maximum":20000,"minimum":200,"description":"Max characters per extracted page (default 4000)"},"extract":{"type":"integer","maximum":6,"minimum":1,"description":"How many top hits to extract (default 4)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"ok":{"type":"boolean"},"query":{"type":"string"},"results":{"type":"array","items":{"type":"object","properties":{"url":{"type":"string"},"title":{"type":"string"},"words":{"type":"number"},"markdown":{"type":"string"}}}}}}}}}},"responseSchema":{"type":"json","example":{"ok":true,"count":3,"query":"x402 payments","results":[{"url":"https://github.com/coinbase/x402","title":"x402","source":"github","snippet":"An open protocol for payments on the web.","relevance":0.92}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","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":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_iU1xSpQmdjyc96ohZepeC","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Search the web across curated sources (Hacker News, GitHub, Wikipedia, Stack Exchange) and return ranked results with snippets","exampleAgentPrompt":"Search for 'x402 payment protocol' across GitHub and Hacker News and give me the top 5 results in JSON format.","exampleUseCases":[{"title":"Finding open source libraries","prompt":"Search GitHub and Stack Exchange for 'USDC stablecoin payment library' and show me the top 10 results — I want titles, URLs, and relevance scores."},{"title":"Researching a technical topic","prompt":"Can you search Hacker News and Wikipedia for 'autonomous AI agents' and return up to 8 results as markdown so I can quickly skim them?"},{"title":"Competitive intelligence lookup","prompt":"Search for 'x402 pay-per-call API' across all sources and return the top 5 results so I can see what projects are talking about it."}],"resultDescription":"A JSON object containing: ok (boolean), query (echoed string), count (number of results returned), and a results array where each item has url, title, source (hn/github/wiki/se), snippet, and relevance score (0–1 float). Optionally returned as Markdown if format=md is requested.","failureModes":["Missing required query parameter 'q' returns a 400 error","Limit value outside 1–20 range is rejected","Invalid source string in 'sources' parameter may return empty results or error","Payment not completed via x402/USDC causes 402 response before search executes","Network issues reaching upstream sources may reduce result count or return ok:false"],"whenToPreferThis":"Use this endpoint when an agent needs ranked web search results with snippets from developer-oriented sources (GitHub, Hacker News, Stack Exchange, Wikipedia) and can pay $0.03 per call via x402 USDC on Base. Prefer this over general web search APIs when the query is technical or developer-focused, when source filtering (e.g. GitHub-only) adds value, and when relevance scoring is needed. Not ideal for broad consumer news or real-time social media search.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:09.944Z","isFirstParty":false,"canonicalSlug":"firstmention-websearch-58d7af55"}