"An overview of REST (Representational State Transfer)" 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.

Connect AI to millions of laws and court cases with the Lawstronaut MCP.

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.

Product search and price comparison for AI agents. Search 100M+ products across thousands of retailers by text or image, compare live offers and prices, and turn any merchant URL into structured product data. No API key required to start; add one for unlimited use and affiliate commission.

Verify public marketplace, retail, classified, and auction listings before an agent relies on them; return source-supported facts or explicit safe-failure states.

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.

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

An MCP server for generating images from HTML & CSS or screenshots of URLs using htmlcsstoimage.com.

Capture batches of public web pages in a real browser and download the screenshots as a zip.

Twitter/X, Instagram, Reddit & TikTok data for AI agents. Billions of posts. No API keys.

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.

smart-data-extractor MCP server on Cloudflare Workers · REST + MCP JSON-RPC · free tier

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.

AI agent website builder. Create and publish link-in-bio sites via MCP or REST API.

Instant web publishing for AI agents. POST HTML, get a live URL. No account needed. Publish, update, and delete websites via MCP or REST API. Free tier includes 5MB sites with 24-hour expiry. Pro tier offers permanent hosting.

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

Free screenshot and webpage capture API. Capture full-page screenshots, specific elements, or PDF snapshots of any URL. No API keys required.