13 developer utility APIs with remote MCP servers on RapidAPI: email, DNS/SSL, QR, text, phone, IBAN/VAT, IP geo, PDF, fraud score, images, UK postcodes, LLM tokens, holidays
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add --transport http calkit https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp --header 'X-RapidAPI-Key: <X_RAPIDAPI_KEY>' --header 'X-RapidAPI-Host: <X_RAPIDAPI_HOST>'~/.codex/config.toml
[mcp_servers.calkit]
url = "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp"
http_headers = { X-RapidAPI-Key = "<X_RAPIDAPI_KEY>", X-RapidAPI-Host = "<X_RAPIDAPI_HOST>" }
# codex mcp add calkit --url https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp~/.cursor/mcp.json
{
"mcpServers": {
"calkit": {
"url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp",
"headers": {
"X-RapidAPI-Key": "<X_RAPIDAPI_KEY>",
"X-RapidAPI-Host": "<X_RAPIDAPI_HOST>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"calkit": {
"type": "http",
"url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp",
"headers": {
"X-RapidAPI-Key": "<X_RAPIDAPI_KEY>",
"X-RapidAPI-Host": "<X_RAPIDAPI_HOST>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"calkit": {
"httpUrl": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp",
"headers": {
"X-RapidAPI-Key": "<X_RAPIDAPI_KEY>",
"X-RapidAPI-Host": "<X_RAPIDAPI_HOST>"
}
}
}
}claude_desktop_config.json · Customize › Connectors › Add custom connector
{
"mcpServers": {
"calkit": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp",
"--header",
"X-RapidAPI-Key:<X_RAPIDAPI_KEY>",
"--header",
"X-RapidAPI-Host:<X_RAPIDAPI_HOST>"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"calkit": {
"url": "https://calkit-public-holidays-business-days-timezones.p.rapidapi.com/mcp",
"headers": {
"X-RapidAPI-Key": "<X_RAPIDAPI_KEY>",
"X-RapidAPI-Host": "<X_RAPIDAPI_HOST>"
}
}
}
}