"An open-source relational database management system" matching MCP connectors:

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.

Verify scraped data against the live source page. Signed verdicts, $0.01 via x402.

Does a cited URL exist, and does the source name what your claim names? Two answers.

Track prices & price history on any online shop, with alerts and an API

Know whether an AI agent should REUSE or REFETCH a URL before retrieving it again.

Verify citations in AI text: fetches each cited source, returns verdicts with evidence quotes.

Resolve sourced merchant facts and safe actions before an agent acts.

URLhaus MCP — wraps abuse.ch URLhaus malware URL database (free, no auth)

Validate whether an IP address belongs to SeznamBot. Remote MCP server exposing a validate_ip tool.

Free technical-SEO audit MCP: crawl a site, run checks, return an LLM-ready shareable report.

Agent-payable web data over x402: 18 keyless services an agent pays per call.

Pay-per-use HTTP proxy. Each proxy_request tool call costs 0.001 USDC on Base Mainnet via x402 protocol. Requires an x402-aware agent to pay automatically.

Open retro-gaming metadata catalog — 91,000 games, 99 systems. Box art, manuals, screenshots, gameplay previews. Free MCP + REST API.

Scan any website for SEO, performance, accessibility, and AI search issues. Returns structured issues with fix prompts you can paste into Claude or Cursor to fix immediately. 40+ checks including Core Web Vitals, Open Graph, structured data, and AI search visibility.

Search open SVG icon packs and fetch exact SVG markup from coding agents through MCP.

YouTube transcripts, subtitles, and video metadata as structured JSON via an Apify Actor.

Scrape, crawl, map & search the web. Open-source, self-hostable Rust crawler & search for AI agents.

Turns any URL into SEO/OpenGraph metadata, public contact signals, tech-stack fingerprinting, Schema.org product data, a security-headers audit, and clean AI-ready Markdown, in one call. Anti-SSRF hardened (DNS pinned post-resolution, private/loopback/cloud-metadata ranges blocked). Hosted via RapidAPI's MCP gateway - free tier, 500 requests/month, no credit card. Source: https://github.com/JosejuX/rapidapi-metadata-extractor

Market research and competitive intelligence for startup ideas - every finding source-linked.

Scrape Open Library book editions, authors, subjects and identifiers. Pay per row.