"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 agents and scripts to read and manage events on your account — guest lists with questionnaire answers, CSV export, check-in, approvals, invites and Text Blasts — through your own signed-in Chrome session, with no public API or official integration required. Runs locally over stdio, streamable HTTP, a REST API with OpenAPI docs, and a Python client.

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.

Read your Pyunto Time Management schedule and log time from an AI assistant. E2EE project planning.

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.

Provides exact calendar calculations from 1971 to 2100, including OPM and Federal Reserve holiday observance, business-day addition and counting, and invoice due dates with weekend and holiday roll rules.

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.

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.

Enables AI assistants to generate chronologically organized Korean pregnancy and parenting schedules—vaccinations, health checkups, leave, and application deadlines—from a due date or child's birthday, with optional API-key features such as night clinic and recall lookups.

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.

Enables AI agents and scripts to manage bookings, provider assignment, rescheduling, cancellations, customers, quotes, invoices, and dashboard data through a self-hosted API and MCP interface using your own Chrome session.

Self-hosted Fresha API and MCP server in Python: 17 Fresha tools for appointments, clients, services, team and reviews, on the session of your own Chrome. Personal use.

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.

Enables offline, fully local lookups and validations tuned for Chinese development work: statutory holiday and adjusted-workday checks, workday arithmetic, ID card/USCC/mobile format validation, Chinese-to-pinyin conversion, lunar-solar date conversion, and administrative region queries. It also provides searchable summaries of common uni-app, mini program, Element Plus, and Vant APIs, so assistants can answer these questions without any network calls or third-party services.

Connects your own Housecall Pro account to Claude Code, ChatGPT, Cursor and other AI agents so you can schedule jobs, assign technicians, send estimates and invoices, and review schedules or aged receivables in plain language. Works on any Housecall Pro plan without a Housecall Pro API key or developer setup.

Enables AI agents to work in a user's signed-in GlossGenius account, allowing natural-language booking, rescheduling, schedule queries, and client follow-ups without requiring a GlossGenius API key.

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

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.

Enables AI agents to work in a signed-in Riverside account by creating studios, scheduling and updating recording sessions, inviting guests, and listing sessions through natural language without a Riverside API key.

Enables AI agents to manage appointments, reschedule bookings, look up clients, and add client notes in a user's signed-in business account without requiring an API key.

Enables AI agents to create, copy, and manage events in a user's own signed-in Meetup account through natural language, without requiring a Meetup API key. It works over HTTP or locally via stdio, forwarding tool calls to a hosted backend.

Connects a signed-in Phorest account to AI agents, enabling natural-language appointment booking and rebooking, schedule and gap checks, client history queries, and client-card notes without a Phorest API key.

Gives AI assistants direct, on-demand access to McGill's public Visual Schedule Builder timetable data, letting them search course offerings, fetch sections and meeting times, check conflicts, and generate ranked schedule combinations without a login, API key, or browser session. Queries and schedule calculations run locally on structured results, with a short-lived cache for repeated requests.

Enables AI agents to operate a signed-in DINGG account through natural-language commands, booking and rescheduling appointments, checking schedules, and following up with clients without requiring a DINGG API key.

Enables AI agents to work within a signed-in Jane App account, listing appointments, reading wait lists, and performing Jane App tasks through tools without requiring a Jane App API key.

Searches Germany's therapie.de therapist directory and inspects public contact details, qualifications, billing options, treatment methods and reported availability without login or API key. Adds a private local workflow for comparing profiles, shortlisting, drafting and exporting enquiry emails, recording appointments, and tracking contact history and follow-ups.

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

Connects a signed-in Mangomint account to Claude Code, ChatGPT, Cursor and other AI agents so they can book and move appointments, check daily schedules and stylist gaps, reply to client messages, and pull client lists using plain language. No Mangomint API key or public API is required, since the server works directly inside the user's own Mangomint account.

An MCP server that gives Claude Code and Codex full control of a personal Outlook.com mailbox and calendar via the Microsoft Graph API, enabling mail, draft, folder, and calendar operations through natural language.

Enables AI agents to work inside a signed-in FieldEdge account, booking jobs, dispatching technicians, managing schedules, and sending invoices through natural-language requests without a FieldEdge API key.

Lets AI agents work directly inside a signed-in Tradify account, creating jobs, drafting quotes and invoices, recording payments and booking staff from plain-language requests. Drafts are shown for approval before anything is sent to a customer, and no Tradify API key is required.

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.