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Verify agent artifacts before you trust them: schema, emptiness, prompt-injection and provenance checks in four layers, deny-by-default. HTTP + MCP endpoint, free tier 20 checks/day, paid per-call via x402 on Base.

Loudness (EBU R128 / BS.1770-4), true-peak, voice-quality and signal analysis of audio files by URL or local path. 10 tools on the AudioLab.tools hosted API: audio is sent, numbers come back, nothing is kept. Free key, 1,000 calls a month.

Live Austin-area MLS listings in your AI assistant — active listings, property details, schools, taxes, and neighborhood data for the Austin metro. Free remote MCP server, no install.

A template for creating a remote, authentication-free MCP server deployable on Cloudflare Workers.

An authentication-free, remote MCP server designed for easy deployment on Cloudflare Workers.

An authentication-free remote MCP server designed for deployment on Cloudflare Workers.

An authentication-free, remote MCP server designed for deployment on Cloudflare Workers.

An authentication-free, remote MCP server designed for deployment on Cloudflare Workers.

An authentication-free, remote MCP server designed for deployment on Cloudflare Workers.

An authentication-free, remote MCP server designed for deployment on Cloudflare Workers.

An authentication-free remote MCP server designed for deployment on Cloudflare Workers.

Score emails and company domains for B2B lead quality: business/free/role/disposable verdict, 0-100 score, MX, provider, SPF/DMARC. Remote MCP. Paid via RapidAPI (free Basic plan); free demo at /demo/mcp./mcp.

Login-free Baidu Baike (百度百科) MCP by Nishant Dilip Sharma. Tools: baike_search, get_baike_entry. No API key.

Opens real web pages in the Banquish macOS app and composes the parts that answer a question (a price, a chart, a player, a table) as live Panels on a Workspace the user sees. Needs the free Banquish app (Apple silicon).

Hosted MCP server for querying U.S. House and Senate STOCK Act disclosures. Its tools cover recent trades, member activity, and ticker activity through a free Bargo API key.

Keyless MCP server for read-only Base on-chain data: wallet and token balances, token metadata, gas prices and transaction status. Free tier.

MCP server that vets LLM-emitted shell commands BEFORE execution. 30 detection rules across destructive file ops, package managers, system, database, git, network, exfiltration, privilege escalation. Sub-second, local, free.

Beamline UI: React UI components by Danylo Pravda; hosted MCP installs selected parts. Free MIT sample. beamline.io

Turn any app idea into a structured PRD, logo, and AI-generated UI mockups. PRD free, logo 1 credit, screens 1 credit each. Deliverables saved to your library and exported as a ZIP.

Model the realistic monthly cost of an LLM app **before you build it**. Not a token calculator: retries, prompt caching, batch discounts, infra overhead, and 3×/10× growth are modeled in, across GPT-5.x, Claude, Gemini, DeepSeek, and more. **Works without a key.** Connect and ask — demo mode covers the six free-tier models. A Pro API key ([beforeyouship.dev](https://beforeyouship.dev)) unlocks the full 18-model catalog.

Live Shopify App Store data in your AI client — keyword rankings, competitor tracking, review intelligence and revenue analytics across 40 tools, with a free tier.

Chess MCP for Claude — Stockfish analysis, attack maps, and game review. Paste one URL, sign in, no install. Free daily budget; Pro $5.99/mo.

Search scientific papers from any MCP tool. Raw experimental data from full-text papers — methods, results, quality scores. 50 free searches, then $0.01/result.

A public board of paid ranks. Free tools to read the board and quote the price of a rank; bid_for_rank returns a hosted checkout link.

Send your sides from the chat to blablabla, the rehearsal app for actors. Find free scenes and monologues, and get a plan for learning lines.

Open-source automation platform (Zapier / Make / n8n alternative) exposed as an MCP server. Agents list, create, run, activate and debug workflows across 250+ integrations, headless Chromium scraping and sandboxed JS nodes; ships a SKILL.md with the node catalog and expression syntax. Hosted (free tier, API key) or self-host.

AI-native training platform for cyclists and runners: your agent reads your training calendar, synced rides, sleep/HRV and a sourced sports-science base, and plans your week. Remote, OAuth, free.

Paste your newsletter URL and Book a Sponsor lists the brands that sponsored similar newsletters, finds who buys the ads and drafts the pitch. It emails those brands every day from its own domains and introduces you when one replies. $20 in free credits, then 10¢ per email. No commission.

First-hand Bordeaux en primeur tasting notes, appellation climate (ERA5), vine phenology and terroir geodata. 14 tools, free tier without a key.

smaller, human. A free local room where your AI coding agents actually talk to each other and share one codebase, without overwriting each other's work.