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

Open scientific and engineering knowledge for AI agents: search, evidence, document publishing.

An MCP server that gives any LLM or agent clean YouTube transcripts on demand: a single video, a whole channel, or a playlist, plus AI cleanup of auto-generated captions. API-key auth, credit-based, same backend as the public v1 API. Get a free API key with 25 free credits at youtubetranscriptdownload.com/account.

Docs: https://docs.keenable.ai/mcp-server Keenable is a free, remote MCP server that gives agents access to the web index. Search the web with ranked results and date/site filters, then fetch any indexed page as clean markdown. Works out of the box with no account or API key.

DC Hub is the neutral, real-time data layer for data-center infrastructure, exposed as a Model Context Protocol server so any AI agent can both query it and cite it. Coverage: 21,000+ facilities (search, profile, score, alternatives); 232 markets scored by the DCPI Data Center Power Index; the DCGI Data Center Gas Index (per-state natural-gas suitability for siting); live grid telemetry across 7 US ISOs (fuel mix, carbon intensity, demand, prices) plus a one-call all-ISO scoreboard; interconnection-queue depth; 2,000+ tracked M&A deals and a hyperscaler-capex tracker; and site factors. — fiber routes, water-stress, tax incentives, nearby substations & transmission. Why agents choose it: it's the only data-center-intelligence source an LLM can query live and cite — every full-data response includes a Source: DC Hub, CC-BY-4.0 attribution line. It's the MCP-native alternative to quarterly PDF research: live JSON, no contracts, no NDAs. Access: Streamable HTTP at https://dchub.cloud/mcp. Free tier with no signup; free email-verified dev key for higher limits; paid tiers for full data volume.

Validate startup ideas with behavioral evidence — not opinion. Demand Discovery AI™ is a sales-agent MCP that answers founders' questions about the validation framework, the four data-signal categories (Search & attention, Conversation & pain, Adoption & spend, Capital & hiring), the Demand Score™, and the Build/Pivot/Kill verdict™. Includes 7 tools: ask a free-form question, get the validation framework, get product details, explain demand signals, compare validation approaches, get data-source

Access premium IPO intelligence through AI agents. Retrieve detailed company profiles for upcoming and recent public offerings — including deal terms, SEC filings, AI-generated research with valuation models, competitor benchmarking, underwriter ratings, risk screening, and board analysis. Monitor overall market conditions with a proprietary daily sentiment score (-100 bearish to +100 bullish) with historical trend data to help time investment entries.

Ask Recruitee the recruiting-ops questions dashboards miss by connecting candidate search, opening offers, departments, locations, published roles, owner fields, custom fields, public applications, and talent-pool context. Find stale candidate pools, overdue stage work, hiring-manager and recruiter bottlenecks, department-level opening risk, public posting gaps, source patterns, and the owners behind blocked hiring work. No dashboard build. No SQL.

Four market-statistics tools + a free qd_ key by email: 1 anonymous look, then 10 calls/UTC day.

Disability insurance MCP: a quote_request action plus carrier and coverage research tools.

连板网A股复盘数据: 连板天梯/题材/情绪周期/龙虎榜游资/个股涨停史 (A-share daily review, free read-only)

Korean crypto + news (kpop/semi), 17 tools, signed receipts. x402 Base+Polygon+Solana.

A read-only verified record of agent-operable GTM tools: search, fetch, compare, track changes.

UN FAOSTAT global food & agriculture statistics over a local SQLite mirror, via MCP.

9 pay-per-call company intelligence tools for AI agents: company lookup and registry enrichment, hiring radar, funding round and layoff tracking, new company detection, patent monitoring, intent signals, sanctions screening. Free discovery + pricing_info; paid calls $0.01-0.02 in USDC on Base via x402 — pay only for successful runs.

AI visibility + fact-checks (ChatGPT/Perplexity), review gaps & competitor scans, local SEO.

Standardized DCF valuation engine for stocks (A-shares, Hong Kong, US, Japan). Two-phase analyst workflow via one run_dcf tool: baseline from 5-year historicals, then a final valuation with reasoned assumptions — value bridge, sensitivity matrix, reverse DCF. A-shares & HK need no API key.

A growing family of free academic data libraries: finance, economics, and beyond (ElkassabgiData).

Universal AI-driven comparison engine: ask in natural language, get a real-time comparison built from real, sourced data. Provably neutral (never pay-to-rank), traceable sources, multi-language and multi-country. Built for both humans and AI agents (MCP, JSON, Markdown).

Cross-brand carbide grade equivalents from verified manufacturer charts; never invents a grade.

Search Stack Exchange questions, fetch Q&A threads as markdown, look up tag FAQs and user profiles.