--- title: "Calendar Index integrations and MCP server - APIANT.ai" description: "Connect Calendar Index to any other app, or use it from your AI client over MCP. Worldwide Holidays and Working Days" canonical: "https://apiant.ai/connections/calendar-index" --- # Calendar Index integrations Connect Calendar Index to any other app, or use it from your AI client over MCP. Worldwide Holidays and Working Days Connects with an API key [calendarindex.com](https://calendarindex.com/) **3** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want to automate with Calendar Index? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Popular ## Calendar Index with the apps people pair it with most - [ **HubSpot to Calendar Index** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-calendar-index) - [ **Salesforce to Calendar Index** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-calendar-index) - [ **Slack to Calendar Index** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-calendar-index) - [ **Google Sheets to Calendar Index** Google Sheets](https://apiant.ai/connect/google-sheets-to-calendar-index) - [ **Gmail to Calendar Index** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-calendar-index) - [ **Google Calendar to Calendar Index** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-calendar-index) - [ **Google Drive to Calendar Index** Google Drive is a cloud storage solution for uploading, sharing, and collaborating on files across devices...](https://apiant.ai/connect/google-drive-to-calendar-index) - [ **Mailchimp to Calendar Index** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailchimp-to-calendar-index) Pair it ## Connect Calendar Index with another app - [ **HubSpot to Calendar Index**](https://apiant.ai/connect/hubspot-to-calendar-index) - [ **Salesforce to Calendar Index**](https://apiant.ai/connect/salesforce-to-calendar-index) - [ **Slack to Calendar Index**](https://apiant.ai/connect/slack-to-calendar-index) - [ **Google Sheets to Calendar Index**](https://apiant.ai/connect/google-sheets-to-calendar-index) - [ **Gmail to Calendar Index**](https://apiant.ai/connect/gmail-to-calendar-index) - [ **Google Calendar to Calendar Index**](https://apiant.ai/connect/google-calendar-to-calendar-index) - [ **Google Drive to Calendar Index**](https://apiant.ai/connect/google-drive-to-calendar-index) - [ **Mailchimp to Calendar Index**](https://apiant.ai/connect/mailchimp-to-calendar-index) - [ **Stripe to Calendar Index**](https://apiant.ai/connect/stripe-to-calendar-index) - [ **Shopify to Calendar Index**](https://apiant.ai/connect/shopify-to-calendar-index) - [ **QuickBooks Online to Calendar Index**](https://apiant.ai/connect/quickbooks-online-to-calendar-index) - [ **Pipedrive to Calendar Index**](https://apiant.ai/connect/pipedrive-to-calendar-index) - [ **ActiveCampaign to Calendar Index**](https://apiant.ai/connect/activecampaign-to-calendar-index) - [ **Notion to Calendar Index**](https://apiant.ai/connect/notion-to-calendar-index) - [ **Airtable to Calendar Index**](https://apiant.ai/connect/airtable-to-calendar-index) - [ **Trello to Calendar Index**](https://apiant.ai/connect/trello-to-calendar-index) - [ **Asana to Calendar Index**](https://apiant.ai/connect/asana-to-calendar-index) - [ **JIRA to Calendar Index**](https://apiant.ai/connect/jira-to-calendar-index) - [ **ClickUp to Calendar Index**](https://apiant.ai/connect/clickup-to-calendar-index) - [ **Zoom to Calendar Index**](https://apiant.ai/connect/zoom-to-calendar-index) - [ **Discord to Calendar Index**](https://apiant.ai/connect/discord-to-calendar-index) - [ **Twilio to Calendar Index**](https://apiant.ai/connect/twilio-to-calendar-index) - [ **SendGrid to Calendar Index**](https://apiant.ai/connect/sendgrid-to-calendar-index) - [ **Outlook to Calendar Index**](https://apiant.ai/connect/outlook-to-calendar-index) - [ **Intercom to Calendar Index**](https://apiant.ai/connect/intercom-to-calendar-index) - [ **Freshdesk to Calendar Index**](https://apiant.ai/connect/freshdesk-to-calendar-index) - [ **Klaviyo to Calendar Index**](https://apiant.ai/connect/klaviyo-to-calendar-index) - [ **Brevo to Calendar Index**](https://apiant.ai/connect/brevo-to-calendar-index) - [ **Typeform to Calendar Index**](https://apiant.ai/connect/typeform-to-calendar-index) - [ **JotForm to Calendar Index**](https://apiant.ai/connect/jotform-to-calendar-index) - [ **Calendly to Calendar Index**](https://apiant.ai/connect/calendly-to-calendar-index) - [ **PandaDoc to Calendar Index**](https://apiant.ai/connect/pandadoc-to-calendar-index) - [ **Webflow to Calendar Index**](https://apiant.ai/connect/webflow-to-calendar-index) - [ **Wix to Calendar Index**](https://apiant.ai/connect/wix-to-calendar-index) - [ **Instagram to Calendar Index**](https://apiant.ai/connect/instagram-to-calendar-index) - [ **OpenAI to Calendar Index**](https://apiant.ai/connect/openai-to-calendar-index) - [ **OneDrive to Calendar Index**](https://apiant.ai/connect/onedrive-to-calendar-index) - [ **Google Docs to Calendar Index**](https://apiant.ai/connect/google-docs-to-calendar-index) - [ **Ontraport to Calendar Index**](https://apiant.ai/connect/ontraport-to-calendar-index) - [ **Freshworks CRM to Calendar Index**](https://apiant.ai/connect/freshworks-crm-to-calendar-index) - [ **Capsule CRM to Calendar Index**](https://apiant.ai/connect/capsule-crm-to-calendar-index) - [ **Copper to Calendar Index**](https://apiant.ai/connect/copper-to-calendar-index) - [ **Streak to Calendar Index**](https://apiant.ai/connect/streak-to-calendar-index) - [ **NetHunt CRM to Calendar Index**](https://apiant.ai/connect/nethunt-crm-to-calendar-index) - [ **MINDBODY to Calendar Index**](https://apiant.ai/connect/mindbody-to-calendar-index) - [ **PostgreSQL to Calendar Index**](https://apiant.ai/connect/postgresql-to-calendar-index) - [ **MySQL to Calendar Index**](https://apiant.ai/connect/mysql-to-calendar-index) - [ **Vercel to Calendar Index**](https://apiant.ai/connect/vercel-to-calendar-index) - [ **PagerDuty to Calendar Index**](https://apiant.ai/connect/pagerduty-to-calendar-index) - [ **Gravity Forms to Calendar Index**](https://apiant.ai/connect/gravity-forms-to-calendar-index) - [ **HubSpot Enterprise to Calendar Index**](https://apiant.ai/connect/hubspot-enterprise-to-calendar-index) - [ **Google Forms to Calendar Index**](https://apiant.ai/connect/google-forms-to-calendar-index) - [ **monday.com to Calendar Index**](https://apiant.ai/connect/monday-com-to-calendar-index) - [ **Google Ads to Calendar Index**](https://apiant.ai/connect/google-ads-to-calendar-index) - [ **Google Tasks to Calendar Index**](https://apiant.ai/connect/google-tasks-to-calendar-index) - [ **Telegram to Calendar Index**](https://apiant.ai/connect/telegram-to-calendar-index) - [ **MailerLite to Calendar Index**](https://apiant.ai/connect/mailerlite-to-calendar-index) - [ **Google Contacts to Calendar Index**](https://apiant.ai/connect/google-contacts-to-calendar-index) - [ **Kit to Calendar Index**](https://apiant.ai/connect/kit-to-calendar-index) - [ **Tally to Calendar Index**](https://apiant.ai/connect/tally-to-calendar-index) What your agent can do with Calendar Index ## Triggers and actions 3 actions - Action **List countries** supported countries and ISO codes (Calendarific). - Action **List holidays** holidays for a country/year (Calendarific). - Action **List languages** supported holiday-name languages (Calendarific). Reviews ## What our customers say Questions ## Calendar Index, answered ### ### Is there a Calendar Index MCP server? APIANT's MCP server at https://mcp.apiant.ai works with Calendar Index. Add that address to any AI client that takes a remote MCP server and sign in once in your browser. Your client can then run Calendar Index actions on demand, or have APIANT build, test and run automations that use Calendar Index. Nothing to install. ### ### What can your agent do in Calendar Index? Any of Calendar Index's 3 actions, including List countries, List holidays and List languages. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can I use Calendar Index directly from Claude, ChatGPT or Cursor? Yes. Connect your AI client to APIANT once and it works with Calendar Index two ways. Ask it to do something in Calendar Index once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running on its own. A one-off action uses your plan's tasks the same way an automation step does. ### ### Do I need to write code against the Calendar Index API? No. APIANT connects to the Calendar Index API for you, with your Calendar Index API key. Describe what you want in plain language and your agent builds it on the Calendar Index triggers and actions in the catalog. If you need an endpoint that is not there yet, your agent reads the Calendar Index API documentation and adds it. ### ### Which apps can Calendar Index connect to? Any app in the catalog; the list on this page pairs Calendar Index with each of them. If the other app is missing, point your agent at its API documentation and it builds the connector. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.