An MCP server that provides a tool for sending transactional emails via Mailtrap

### Deterministic Music Theory for Claude, Cursor, and Autonomous AI Agents Large Language Models (LLMs) frequently hallucinate music theory, leading to incorrect notes, false Roman numerals, and broken voice leading. **THIRI** solves this by providing a deterministic, mathematical music-theory engine (pitch-class-set theory over ℤ/12) directly to your AI. It gives AI assistants precise, reproducible harmonic reasoning in milliseconds, allowing them to write correct musical scores, analyze progressions, and generate playable arrangements. #### 🎷 Key Features: * **Chord Analysis (`analyze_chord`):** Parse any symbol (e.g., `Cmaj7/E`, `G7#11`) to retrieve root, quality, intervals, Roman numerals, and diatonic or chromatic harmonic functions. * **Note Resolution (`resolve_chord`):** Resolve chord symbols to spelled notes (enharmonically correct), frequencies (Hz), MIDI numbers, and scale recommendations. * **Voicing Engine (`generate_voicing`):** Generate instrument-ready voicings (rootless, shell, triad, pad, drop-2, drop-3) and calculate voice-leading scores for transitions. * **Reharmonization (`reharmonize`):** Substitute progressions using classic jazz techniques, including Tritone Substitution, ii-V Insertion, Modal Interchange, Coltrane Changes, and Backdoor cadences. *Ideal for developers building AI music assistants, digital audio workstation (DAW) agents, educational theory tools, and automated composition workflows.*

MCP server for RedirHub — AI-powered URL redirect management and link shortener. Create, update, test, and monitor redirects via Claude, Cursor, and any MCP client. Alternative to Bitly with custom domains and team collaboration.

Non-custodial USDC <-> bank for AI agents. Free quotes; $0.05 USDC per session via x402; 1% commission itemised in every quote. Own funds only. PT + EU/EEA (not UK). 18+.

Bitcoin blockchain MCP server providing 17 tools: BTC price/info, mempool fees, transaction details, address lookups, blockchain debug, whale alerts, SEC insider trading tracker, web scraping/summarization, systems theory, game theory, capital flows analysis, and Reddit API (hot/search/trending). SSE endpoint.

MCP bridge that lets Claude Code delegate heavy tasks to the Antigravity CLI (agy) — purpose-built tools, model routing with fallback, session continuity, and output truncation to save Claude's context and tokens.

Generate wiki docs from source code. Supports PowerShell, Python, Go, C#. Java, COBOL are coming soon.

AI-powered website audit for Claude. Analyze any URL across SEO, performance, accessibility, UX, content quality, and 10+ other categories — get a scored report in under 2 minutes. Free tier included (3 audits/day).

The first MCP-native sponsored product ad network for beauty. RTB auction in <100ms. 6 tools. Tools: sponsored_search, brand_spotlight, routine_builder, skin_match, fire_billing_event, get_shopper_prefs

Repository management, file operations, and GitHub API integration

Create a remote sandbox that can execute code/run commands/upload and download files. 创建远程沙盒，可以执行代码/运行命令/上传下载文件

Official MiniMax Model Context Protocol (MCP) server that enables interaction with powerful Text to Speech, image generation and video generation APIs.

Feedjolt's MCP server gives AI agents and MCP clients programmatic access to your feedback boards, posts, comments, roadmap, and changelog. Read feature requests, triage and tag feedback, change post statuses, merge duplicates, and publish changelog entries straight from any MCP-compatible client. Built for startups and indie teams who run their feedback loop where they build. Streamable-HTTP transport, API-key auth.

Bitcoin blockchain data server for AI agents — 17 tools (fees, mempool, transactions, address portfolio, trace, whales, SEC insider trades, web scraping, AI summarization, systems theory, game theory, capital flows, Reddit). x402 USDC micropayments on Base. No API keys needed.

基于七牛云产品构建的 Model Context Protocol (MCP) Server，支持用户在 AI 大模型客户端的上下文中通过该 MCP Server 来访问七牛云存储资源、利用 Dora 服务进行图片操作等。 如果有什么需求欢迎在下方评论，您也可以在 github 仓库中提 issue。

Channel management and messaging capabilities

Job search engine with 500k+ listings across Austria, Germany and Switzerland (alleskralle.com).

Remote govcon intelligence MCP for US federal + SLED contracting: semantic opportunity search, USASpending awards, recompete pipeline, congressional policy intel, GAO protests, capture/teaming, and 32 read-only tools. Streamable HTTP at https://mcp.primerfp.com/mcp.

Callingly is an MCP server that lets AI agents actually get leads on the phone. Connect Claude, ChatGPT, or n8n and it can place a call, send an SMS, or schedule a callback — Callingly dials your sales team, plays the lead's details, and warm-transfers the conversation. 8 tools: dispatch + AI calls, SMS, scheduling, sequences, and call reporting. Remote server (streamable HTTP) with OAuth 2.0.

A production MCP server giving AI agents live Polymarket data as native tools: market search and prices, insider-scored whale trades (each verifiable by on-chain tx hash), trader leaderboards across 10 categories and 4 time windows, and wallet P&L profiles. Hosted on Apify (Streamable HTTP, pay-per-call, no API keys); the only hosted zero-install option among Polymarket MCP servers. Fully async, fail-loud data integrity.

Crypto-paid no-KYC VPS that AI agents rent and operate end-to-end over MCP — list plans, fund a USDC/USDT balance, order a server, get root access. 16 tools, Streamable HTTP, root in ~60s. No card, no human at checkout. Humans can use it too.

LiveAuth MCP Server gives AI agents cryptographic proof-of-work + Lightning Network authentication. Agents solve a PoW challenge, get a signed JWT, and use it to call paid MCP tools. Each tool call is metered in sats and recorded as a signed revenue event with a verifiable receipt. Built on L402 (the Lightning-Native HTTP 402 protocol from Lightning Labs). Compatible with x402 (Cloudflare/Coinbase). Non-custodial — no KYC, no account, no email. Pay per call in sats over Lightning. Install: `npx -y @liveauth-labs/mcp-server` Docs: https://docs.liveauth.app/mcp-liveauth-gate Source: https://github.com/dulzuradev/liveauth-mcp

A Model Context Protocol server that provides access to Redis databases. This server enables LLMs to interact with Redis key-value stores through a set of standardized tools.

Automatically create a remote browser to complete your specified tasks, developed based on Browser Use + Sandbox. 自动创建一个远程浏览器，完成你指定的任务，基于Browser Use + Sandbox开发。

An MCP server implementation that provides a tool for dynamic and reflective problem-solving through a structured thinking process.