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Search and research

Resources for finding information.

They cover web search APIs, deep-research agents, fact and citation checks, news search and reference lookups.

Listings are what publishers declare in their ARD catalogs and the registries StealthStack reads. The category and summaries are our reading of each listing. Each listing links to its own page with the publisher's endpoint.

All types MCP serversSkillsA2A agentsAPIs
Web searchDeep researchFact-checkingNews searchReference lookup
  1. MCP SERVERVend Web Search (x402, Nano) Web search with snippets; 0.0001 XNO per call via x402, no signup.
  2. SKILLperplexity Zapier connector skill for Perplexity: cited web answers, search and deep research.
  3. MCP SERVERNeurobird Search (MCP) Web search with fused rankings, passages and grounded answers; $2/1K searches, free tier.
  4. MCP SERVERYou.com MCP Server Hosted You.com server: web search, URL extraction, cited research and finance research.
  5. A2A AGENTSource Claim Proof Checks whether a public source page supports one atomic factual claim.
  6. A2A AGENTSource Checker Checks whether listed sources support a claim, with verified verbatim quotes.
  7. A2A AGENTTavily Tavily search for agents: web search, extraction, crawling, mapping and research.
  8. MCP SERVERgroundroute-web-search Multi-engine web search with price-led routing, caching and citations.
  9. APIBrave Search via MPP Brave Search web, news, image and video results, billed per request over MPP.
  10. SKILLexa-search Skill for Exa-powered web search tuned for scientific and technical content.
  11. MCP SERVERVend Neural Search (x402, Nano) Neural web search ranked by relevance; 0.0005 XNO per call via x402, no signup.
  12. SKILLYou Web Skill for You.com web search, URL extraction and cited synthesis.
  13. APINeurobird Search REST API Tavily-compatible REST web search and URL-to-markdown extraction API.
  14. MCP SERVERWorld Monitor MCP server Live global intelligence: markets, conflicts, aviation, maritime, energy and briefs.
  15. A2A AGENTWeb Evidence Verifies factual claims against web evidence with citations and snapshots.
  16. SKILLYou Research Skill routing research tasks to You.com Research API or agentic search workflows.
  17. A2A AGENTGhost — web search for agents, one x402 payment Web search results in one x402 payment, multi-provider, no API key.
  18. MCP SERVERresearch-synthesis Synthesizes a research report on any topic from HN, OpenAlex, arXiv, Reddit, DDG.
  19. CATALOGNeurobird Search catalog Catalog of Neurobird web search via MCP, HTTP and x402 pay-per-call, no account.
  20. API2s.io Search Web search, AI search, crawl and extract for agents; x402 USDC per call.
  21. SKILLYou Free Skill for unauthenticated basic web search via the free You.com MCP profile.
  22. API2s.io Wikipedia Wikipedia article summaries in 30 languages; pay per call via x402 USDC.
  23. APIWorld Monitor REST API REST API for conflict, market, energy, maritime and supply-chain intelligence.
  24. API2s.io News Hacker News items, search and feeds plus news search; x402 USDC per call.
  25. SKILLdoublecheck Skill that verifies AI output claims against web sources and flags hallucinations.
  26. MCP SERVERGlean Remote MCP Server Connects Glean enterprise knowledge search to IDEs, LLMs and agents.
  27. SKILLAnswers Skill for Brave AI-grounded answers via an OpenAI-compatible chat completions API.
  28. API2s.io Wikidata Fetches a Wikidata entity; pay per call via x402 USDC.
  29. API2s.io Factcheck Searches published fact-checks; pay per call via x402 USDC.
  30. APIx402 Entity-ID Resolver Resolves ambiguous names or tickers to canonical IDs (SEC, GLEIF, Wikidata, CoinGecko).
  31. SKILLYou.com Onboarding Skill onboarding coding agents to You.com tools via plugin, OAuth or API key.
  32. SKILLBx Skill for Brave Search web search, research and grounding lookups.
  33. MCP SERVERYou.com Docs MCP Server Searches You.com developer docs, API references and code examples; keyless.
  34. MCP SERVERDynamic Feed: keyless live-data MCP server Keyless server for live signed real-world data with provenance envelopes.
  35. SKILLalgolia Zapier connector skill for Algolia: index records, search, manage settings and synonyms.
  36. SKILLLocal Pois Brave Search skill for local business and point-of-interest details.

Related categories

Browser automation and scrapingScience and academic research All categories