Quackr MCP Server

Get virtual phone numbers for SMS verification, OTP receipt, and number management.

Documentation

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.

Hosted endpoint: https://mcp.quackr.io/ Transport: Streamable HTTP Auth: Authorization: Bearer YOUR_API_KEY header

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

Claude Code Setup

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, so add Quackr as a remote connector instead: 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.