Search & Knowledge MCP Servers
Search engines, RAG, knowledge graphs, memory
2,874 servers
Library
Search and discover 25,000+ MCP servers across all major registries. Connect and pay autonomously.
Nexus Alpha Geometry
Finance research agent for thesis, trade note, and market-state review.
com.apievangelist/api-evangelist
Sixteen years of API research as MCP tools — stories, areas, governance blocks & services
Tolstoy Library
Browse, search, rename, and favorite your Tolstoy media library from any AI client.
io.github.MelanieABC/misim-tax-research
Israeli tax research: source-grounded answers with official citations, in Hebrew.
org.wikiprompt/mcp
The Wikipedia of AI prompts: search 900+ curated prompts by model, style and type, in 7 languages
ai.openhelm/seo-growth
Autonomous SEO + GEO growth: keyword research, audits, content, AI answer-engine visibility.
RepScale
Sales research and prep tools for B2B reps. Prospect briefs, angles, citations.
ResearchSprint
AI research reports: market analysis, competitor intel, blog posts. USDC payment.
io.github.dbnexsus/nexsus
Private persistent memory for Claude, ChatGPT & Gemini via MCP - semantic search, zero-code setup.
WindowsForum MCP Server
Search WindowsForum.com threads, posts, and Windows news; fetch documents and Microsoft KB info.
ResolveMesh Compatibility Intelligence
Read-only, source-backed compatibility lookups and approved changes for ResolveMesh's catalog.
io.github.KairosMobius/nexus-memory-mcp
Persistent semantic memory for AI agents with knowledge graphs and Intelligence Packs.
matterfact
Investment research superagent: podcasts, SEC filings, and no-code research pipelines.
io.github.mem0ai/mem0
Persistent memory for AI agents: add, search, update, and delete long-term memories.
Erik Bethke's Blog & Knowledge Graph
Search, read, and traverse 3,800+ posts on AI, energy, policy, games, and investing as a graph.
com.thenextgennexus/academic-research-mcp-server
arXiv and OpenAlex/Crossref paper search (an open Google Scholar alternative) as agent tools.
WorkingMemory
Persistent personal memory for AI assistants — save, search, and recall across every MCP client.
ai.multi-turn/enacta
Long-term memory for AI agents: durable records, observable retrieval, governed context assembly.
Margin of Insight — Equity Research
Equity research API for US-listed companies. Free primer, $1 fundamentals, $2 investment memo.
STIL Lab Assistant
STIL lab at ETS Montreal — knowledge base and paper search via ArXiv and Semantic Scholar.
Filtrous MCP Catalog Server
Search Filtrous lab-filtration products by spec, get prices, and request quotes from your AI agent.
LLM Hosting Pricing
LLM and GPU rental prices: model price lookup, GPU listings, cheapest-GPU search, price history
Xavio Storefront
Search the public Xavio catalog and create firm checkout quotes.