MCP connector for Claude

Public Holidays

Public, bank and regional holidays for 200+ countries, plus business-day counts and deadlines. Computed offline: no credentials, and nothing you ask leaves OpenJack.

Add it to Claude

1. Create an account and add credits at https://openjack.dev; copy your connection key.
2. In Claude, open Settings → Connectors → Add custom connector and paste https://public-holidays.openjack.dev/mcp.
3. Click Connect. You will be asked for the connection key.

How your data is handled

The connector keeps no logs and no cache, and stores none of the data it passes to Claude. Every tool is read-only.