Quackr — Claude Code MCP server: what it does, how to install
Connects your MCP agent to Quackr to rent temporary phone numbers, check country availability, and fetch incoming verification SMS.
claude mcp add quackr -e QUACKR_API_KEY=<QUACKR_API_KEY> -- npx -y quackr-mcpWhat Quackr does
The Quackr server lets your agent manage temporary phone lines and read incoming one-time passwords directly in conversation. It exposes tools to inspect your USD balance, look up rates for specific countries, check current inventory, and view active numbers.
Integration works over Streamable HTTP at https://mcp.quackr.io/ or via a local stdio bridge with npx -y quackr-mcp. The npm runner requires Node.js 18+.
Calling purchase-number deducts funds immediately from your USD balance. Without an active API key and available funds on quackr.io, purchases will fail.
What it helps with
- retrieve incoming verification SMS and OTP codes
- inspect account balance in USD before purchasing
- check rental rates and inventory across countries
- rent disposable phone numbers for automated workflows
Example prompts for the agent
- Check my Quackr account balance and show prices for US numbers.
- Rent a temporary number and wait for the verification code SMS.
- Show all active phone numbers rented on my account.
How to install Quackr
1Platform CLI
claude mcp add quackr -e QUACKR_API_KEY=<QUACKR_API_KEY> -- npx -y quackr-mcpReplace <…> with your own values
2Platform CLI: remote server
claude mcp add --transport http quackr https://mcp.quackr.io/1Platform CLI: remote server
codex mcp add quackr --url https://mcp.quackr.io/2Platform CLI
codex mcp add quackr --env QUACKR_API_KEY=<QUACKR_API_KEY> -- npx -y quackr-mcpReplace <…> with your own values
Config file
{
"mcpServers": {
"quackr": {
"url": "https://mcp.quackr.io/"
}
}
}{
"mcpServers": {
"quackr": {
"command": "npx",
"args": [
"-y",
"quackr-mcp"
],
"env": {
"QUACKR_API_KEY": "<QUACKR_API_KEY>"
}
}
}
}Replace <…> with your own values
Config file
{
"servers": {
"quackr": {
"type": "http",
"url": "https://mcp.quackr.io/"
}
}
}{
"servers": {
"quackr": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"quackr-mcp"
],
"env": {
"QUACKR_API_KEY": "<QUACKR_API_KEY>"
}
}
}
}Replace <…> with your own values
1Platform CLI: remote server
gemini mcp add -t http quackr https://mcp.quackr.io/2Platform CLI
gemini mcp add -e QUACKR_API_KEY=<QUACKR_API_KEY> quackr npx -y quackr-mcpReplace <…> with your own values
Step by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about Quackr
How to install Quackr in Claude Code?
Run claude mcp add quackr -e QUACKR_API_KEY=<QUACKR_API_KEY> -- npx -y quackr-mcp in your terminal, replacing <QUACKR_API_KEY> with your key from quackr.io.
What does the Quackr MCP server do?
It provides tools to check phone inventory, purchase disposable numbers, and inspect incoming SMS messages for automated testing or account verification.
What prerequisites are needed to run Quackr?
You need a quackr.io account with an API key, an active USD balance to pay for numbers, and Node.js 18+ if using the stdio launcher.
