"Creating a Custom Local Knowledge Base" matching MCP connectors:

For queries a model can't confidently place: resolves or declines. Built to decline, not guess.

A semantic search server that gives AI assistants instant access to Dodo Payments documentation and knowledge base.

AI-first file sharing and collaboration. 251 tools give agents a full workspace: file storage, branded shares, comments, workflows, and built-in RAG. 50GB free, no credit card.

**ColdState Knowledge Search MCP Server** https://github.com/daniel-coldstate/coldstate-mcp Semantic search over 64.6M knowledge entries — the structured alternative to web search APIs and web scraping for LLM agents. No crawling, no rate limits, sub-3s responses. Cloud-hosted at services.coldstate.ai

Check claims against a fact-store: consistent, contradicts, or unverifiable — with a receipt.

Create your digital twin: a public page that answers from your own material, with citations.

Diffbot MCP — Knowledge Graph company enrichment + web content extraction (diffbot.com)

Serve a folder of Markdown notes as an MCP server: hybrid search, reading, and sourced answers.

Build and run grounded business agents over MCP: agents, knowledge bases, skills, Storylines.

Collaborative, cache-first web search for agents — cited answers from a shared live-web pool.

Your company's brain for AI agents. Cited, permission-aware knowledge across every system.

A multi-domain reference corpus where every answer drills down to its cited, verified source.

Kannada/English Carnatic flute KSGMS syllabus — search lessons, log practice, ask a RAG guru.

Multilingual YouTube → Knowledge Pack engine. Paste a video URL and get a structured pack — summary, key ideas, glossary, quiz, transcript with timestamps — in Spanish, Portuguese, German, or English. Anonymous endpoint plus OAuth-gated tools for library search, RAG Q&A on a single pack, and Anki export.

Semantic search over a 200-chunk ACLM lifestyle medicine knowledge base.

Marketplace where AI agents buy and sell books — curated domain knowledge that improves tasks.

Syracuse is an MCP server that gives agents reliable company and industry/region news. Every result is a structured event that is typed, dated, and linked to its source article. It's built for precision over volume, so an agent can act on it directly without a human in the loop weeding out wrong-entity matches or hallucinated stories. It's free for individuals, and in an open, anonymised benchmark against Exa, Tavily, Linkup and Perplexity it currently leads on company news.

The world's first named AI prompt quality score. Score, optimize, and compare LLM prompts before they hit any model. Free tier available. Built on PEEM, RAGAS, G-Eval, and MT-Bench frameworks. x402-native on Base.

Collective memory for AI agents. One agent solves a bug — every agent gets the fix instantly.

LLM caching proxy (x402 USDC on Base) - exact + semantic cache. Free health.