44 calculators for AI agents: US tax, finance, business + an MCP engineering & security suite.
Setup
Choose your client, copy the config, then fill in any required environment variables.
claude mcp add --transport http freetoolhub https://freetoolhub.org/api/mcp --header 'X-API-Key: <X_API_KEY>'~/.codex/config.toml
[mcp_servers.freetoolhub]
url = "https://freetoolhub.org/api/mcp"
http_headers = { X-API-Key = "<X_API_KEY>" }
# codex mcp add freetoolhub --url https://freetoolhub.org/api/mcp~/.cursor/mcp.json
{
"mcpServers": {
"freetoolhub": {
"url": "https://freetoolhub.org/api/mcp",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}.vscode/mcp.json
{
"servers": {
"freetoolhub": {
"type": "http",
"url": "https://freetoolhub.org/api/mcp",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}~/.gemini/settings.json
{
"mcpServers": {
"freetoolhub": {
"httpUrl": "https://freetoolhub.org/api/mcp",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}claude_desktop_config.json · Customize › Connectors › Add custom connector
{
"mcpServers": {
"freetoolhub": {
"command": "npx",
"args": [
"-y",
"mcp-remote",
"https://freetoolhub.org/api/mcp",
"--header",
"X-API-Key:<X_API_KEY>"
]
}
}
}.trae/mcp.json
{
"mcpServers": {
"freetoolhub": {
"url": "https://freetoolhub.org/api/mcp",
"headers": {
"X-API-Key": "<X_API_KEY>"
}
}
}
}