"How to obtain an API key" matching MCP servers:

Measures the shape of idle time in a booking calendar. Separates gaps that can actually be sold from structurally unsellable dead time, accounting for turnover time and the booking start grid. Fully offline, no API key required.

Provides real, official public holiday data for ~100 countries with tools to list holidays for a year and check if a specific date is a holiday. Free, no API key required, powered by Nager.Date.

Enables AI assistants to interact with Fastmail services, providing tools for comprehensive email management, contact searching, and calendar event coordination via the JMAP API. It supports advanced features like threaded conversations, attachment handling, and bulk mailbox operations through natural language.

Enables AI apps to manage Google Calendar in plain language, including reviewing schedules, creating and changing events with guests and Google Meet, finding free time, and blocking Out of Office or Focus Time.

Provides verified ANZ public holidays, school terms, and business-day calculations for all 9 regions of Australia and New Zealand, backed by data for 2026 and 2027.

MCP server for Google APIs — Gmail and Calendar tools for LLM agents.

Discovers events from Luma's public feed and subscribed calendars, with distance filtering, category search, and ICS export. No API key required for basic discovery.

Enables users to find available appointment slots from a public resource schedule over an inclusive date range, applying booking-window rules when requested. It returns wall-clock times and flags truncated result sets, operating read-only without account or API key.

This project implements a Python-based MCP (Model Context Protocol) server that acts as an interface between Large Language Models (LLMs) and the Google Calendar API. It enables LLMs to perform calendar operations via natural language requests.

An unofficial MCP server for Tend dental that aims to let users access their own Tend account data (e.g., appointments) via natural language. Currently it is scaffold-only with stub API calls and not yet functional.

Enables AI agents to interact with Notion Calendar through an undocumented API, supporting calendar and event management, scheduling, RSVPs, preferences, contacts, and more via natural language.

Book a table, an appointment or a place in a class at a real local business. Live availability, instant confirmation, no account and no API key. Eight tools: search, fetch, get_business, check_availability, create_booking, check_booking, cancel_booking and request_listing. Guest emails in eight languages. Hosted at https://g-guest.app/api/mcp

An MCP server for the Luma Events API that enables creating, updating, and managing events and guests.

An MCP server that enables scheduling, updating, deleting, and listing calendar appointments through Cal.com's Calendar API.

An MCP server that provides access to the Google Calendar API, allowing AI assistants to list and retrieve calendar items via OAuth 2.0 tokens.

MCP server to list and get events from Evento's public API using an API key.

An unofficial MCP server that exposes the Timetastic API to enable querying and managing absence & leave data.

An ADT-based calendar management system that enables users to create, update, and organize events by category with integrated stamina tracking functionality.

Enables any MCP client to manage the full MeetStream meeting-bot lifecycle: create, record, transcribe, summarize, interact live, and auto-join calendar meetings via 19 callable tools.

Enables AI agents to read and manage Microsoft 365/Outlook email and calendar, with destructive actions (send email, create event) requiring human approval.