Zero-signup business-day / working-day date arithmetic API. Add/count working days with your own holiday list. No account, no API key, one GET.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add --transport http openworkdays https://openworkdays.vercel.app/api/mcp~/.codex/config.toml
[mcp_servers.openworkdays]
url = "https://openworkdays.vercel.app/api/mcp"
# codex mcp add openworkdays --url https://openworkdays.vercel.app/api/mcp~/.cursor/mcp.json
{
"mcpServers": {
"openworkdays": {
"url": "https://openworkdays.vercel.app/api/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"openworkdays": {
"type": "http",
"url": "https://openworkdays.vercel.app/api/mcp"
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"openworkdays": {
"httpUrl": "https://openworkdays.vercel.app/api/mcp"
}
}
}claude_desktop_config.json · Customize › Connectors › Add custom connector
{
"mcpServers": {
"openworkdays": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://openworkdays.vercel.app/api/mcp"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"openworkdays": {
"url": "https://openworkdays.vercel.app/api/mcp"
}
}
}