"Bitcoin Cash" matching MCP servers:

A minimal MCP server for sending plain-text emails and managing Gmail user labels over stdio, using only gmail.send and gmail.labels OAuth scopes.

Enables two-way communication between Claude and Slack for posting messages, managing threads, and handling files. It specifically supports asynchronous workflows by allowing Claude to poll for remote user replies and send task notifications.

Enables AI models to interact with Twitter, including posting tweets, searching, following users, and chatting with Grok, using cookie or credential authentication.

A Model Context Protocol (MCP) server that provides access to the Fastmail API, enabling AI assistants to interact with email, contacts, and calendar data.

Connects AI assistants to Google Workspace (Gmail, Drive, Docs, Sheets, Slides, Calendar, Tasks, Forms, Chat, Contacts) through your own OAuth app, providing around 120 tools for managing email, files, calendar, and more.

Enables Claude Desktop to autonomously perform HR operations such as employee onboarding, leave management, meeting scheduling, ticket creation, and email notifications through MCP tool calling.

Hosted MCP server for Argentine commerce: real AFIP/ARCA fiscal invoicing (live CAE), MercadoPago payments, logistics, catalog, cash register and WhatsApp behind one authenticated endpoint. Includes 9 no-auth fiscal validation/formatting tools.

Enables structured team communication for Claude Code agents through Slack-like channels and direct messages. Supports project isolation, subscription management, and agent notes for sophisticated multi-agent collaboration workflows.

Connects Claude to Google Chat for searching messages, spaces, and DMs, automatically resolving user IDs to real display names.

A self-hosted push inbox for AI agents that enables agents to send updates and ask questions, waiting for user answers before continuing.

Enables comprehensive Mattermost administration and operations, including managing users, teams, channels, messages, plugins, and admin console settings through MCP tools.