"MCP servers that don't require API keys" matching MCP servers:

MCP server for the Stashcat messenger API. Enables AI assistants to read and send messages, manage channels, conversations, files, polls, and more.

Experimental server that implements the Model Context Protocol (MCP) for Nylas API, providing resources, tools, and prompts to help developers integrate email, calendar, and contacts functionality with AI applications.

Enables to interact with Nylas API for email, calendar, and contacts via MCP, providing documentation, code samples, and code generation tools.

Japanese calendar API for AI agents. Provides Rokuyo, Rekichu, Eto, 24 Solar Terms, and fortune judgments. MCP + REST API.

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 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.

Exposes the Appointment Scheduler API to AI agents as an MCP server, enabling them to list users and services, check availability, book, list, and cancel appointments via natural language.

MCP server that wraps the AddEvent Calendar & Events API v2, allowing Claude to create, search, retrieve, update, and delete events, calendars, and RSVP attendees, plus list timezones.

Provides Japanese business day calculations: add or subtract business days, count between dates, check whether a date is a business day, and reverse-calculate deadlines. Handles national holidays and year-end periods fully offline with no API keys required.

Provides Japanese national holidays, wareki (era) conversion, and date information. Works fully offline with no API keys required.

Enables users to track job and internship applications, statuses, deadlines, and interviews, with upcoming reminders and CSV or Markdown export. It runs locally and stores data in a single JSON file without network calls, accounts, or API keys.

MCP server for the eRezo API that enables managing professional contacts and events directly from Claude, including listing, creating, updating, and deleting contacts, as well as event registration.

Enables AI agents and scripts to run a Booksy Biz account through your own signed-in Chrome session, exposing 28 tools for appointments, open slots, time off, clients, services, staff, reviews, Message Blasts, and reports over MCP, REST, or Python. Read-only mode and confirmation-gated client-facing actions let you plan schedules, reschedules, and outreach with human approval.

Enables AI agents to query Türkiye-specific data and logic without API keys: official central-bank exchange rates and currency conversion, live AFAD/Kandilli earthquakes, the official holiday calendar with business-day math, IBAN/TCKN/VKN validation, province and district lookup, prayer times, weather forecasts, plus Turkish-correct text casing and amounts written out in words. All 17 tools are read-only, with most working fully offline.

MCP server for corporate Exchange that provides access to email, calendar, and people directory via OWA JSON API.

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 AI assistants to read and create Fantastical calendar events on macOS using local database access and URL schemes, working entirely offline without API keys or network access.

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