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Quackr MCP Server
Official MCP server for Quackr — virtual phone numbers for SMS verification and OTP receipt. Use Claude (or any MCP-compatible client) to check pricing and inventory, purchase temporary numbers, and read incoming SMS programmatically.
- npm:
quackr-mcp—npx -y quackr-mcp - Hosted endpoint:
https://mcp.quackr.io/ - Transport: Streamable HTTP
- Auth:
Authorization: Bearer YOUR_API_KEYheader
Tools
| Tool | Description |
|---|---|
get-balance | Get the current account balance in USD |
get-pricing | Get phone number rental pricing for a specific country |
get-inventory | Check available phone number inventory for a country |
purchase-number | Purchase a temporary number for receiving SMS (deducts from balance) |
check-sms | Check SMS messages received on a rented number |
list-active-numbers | List all currently active (rented) numbers on the account |
Getting an API Key
- Sign in at quackr.io
- Open your profile page
- Copy the API key from the API section
Install via npm
The quackr-mcp package is a thin stdio launcher that bridges any stdio MCP client to the hosted Quackr endpoint. It needs Node.js 18+ — no separate install required, npx fetches it on first run.
{
"mcpServers": {
"quackr": {
"command": "npx",
"args": ["-y", "quackr-mcp"],
"env": {
"QUACKR_API_KEY": "YOUR_API_KEY_HERE"
}
}
}
}You can also pass the key as a flag instead of an env var: npx -y quackr-mcp --api-key YOUR_API_KEY_HERE.
Claude Code Setup
Remote (recommended) — connect directly to the hosted endpoint. Add to your ~/.claude.json (or a project .mcp.json):
{
"mcpServers": {
"quackr": {
"type": "http",
"url": "https://mcp.quackr.io/",
"headers": {
"Authorization": "Bearer YOUR_API_KEY_HERE"
}
}
}
}Or via the CLI:
claude mcp add --transport http quackr https://mcp.quackr.io/ --header "Authorization: Bearer YOUR_API_KEY_HERE"Claude Desktop Setup
Claude Desktop's JSON config only supports local (stdio) servers. Use the npm launcher (see Install via npm) by adding the npx quackr-mcp config above to claude_desktop_config.json, then restart Claude Desktop.
Alternatively, add Quackr as a remote connector: Settings → Connectors → Add custom connector, enter https://mcp.quackr.io/, and add an Authorization header with the value Bearer YOUR_API_KEY.
Other MCP Clients
Any client supporting remote Streamable HTTP MCP servers with custom headers works. Point it at https://mcp.quackr.io/ and pass your key via the Authorization: Bearer YOUR_API_KEY header.
REST API
Quackr also exposes a full REST API at https://api.quackr.io/ — see api.quackr.io/swagger.json for the full spec. Same x-api-key auth.
Support
- Website: quackr.io
- Issues: file in this repo
- Email: [email protected]
License
MIT — see LICENSE.