Quackr

io.quackrPublished by quackr.ioOfficial publisherv1.0.3Updated Oct 24, 2026

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

VerifiedStreamable HTTPWeb executableCommunication & Collaboration Business & Commerce

Server details

Identifier: io.quackr/quackr
Transport: Streamable HTTP
Runtime: Web executable
Trust: Verified
Published: Sep 16, 2026

Security note

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Overview

AI-generated overview

Quackr's official MCP server lets an assistant check pricing and inventory, rent virtual phone numbers, and read incoming SMS and OTPs.

What you can do: Check account balance in USD
Look up number rental pricing and available inventory by country
Purchase a temporary number for receiving SMS, deducted from balance
Read SMS messages received on a rented number
List all currently active rented numbers on the account
When to use it: Useful when you need a disposable phone number to receive SMS verification codes or OTPs during sign-ups and testing, and want an assistant to buy and monitor numbers without leaving the chat.
Requirements: A Quackr account and API key from the profile page, passed as the QUACKR_API_KEY environment variable or an Authorization Bearer header. Runs either against the hosted Streamable HTTP endpoint or locally via the npm package quackr-mcp, which needs Node.js 18+ and npx.

Before you install

Purchasing a number spends real money from the account balance, so confirm cost before letting an assistant buy. The API key is a billing-capable credential; keep it out of shared configs. SMS content received on rented numbers passes through Quackr's service.

Installation

In SourceWeft

Open Quackr in the dashboard and add it to a workspace.
Connect the required credentials. They are stored privately and never shown on public pages.
Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.quackr%2Fquackr/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config. The client completes OAuth sign-in on first connect.

{
  "mcpServers": {
    "quackr": {
      "type": "http",
      "url": "https://mcp.quackr.io/"
    }
  }
}

README

Quackr MCP Server

[npm version] [npm downloads] [License: MIT]

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_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

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.

json

{  "mcpServers": {    "quackr": {      "command": "npx",      "args": ["-y", "quackr-mcp"],      "env": {        "QUACKR_API_KEY": "YOUR_API_KEY_HERE"      }    }  }}

{  "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):

json

{  "mcpServers": {    "quackr": {      "type": "http",      "url": "https://mcp.quackr.io/",      "headers": {        "Authorization": "Bearer YOUR_API_KEY_HERE"      }    }  }}

{  "mcpServers": {    "quackr": {      "type": "http",      "url": "https://mcp.quackr.io/",      "headers": {        "Authorization": "Bearer YOUR_API_KEY_HERE"      }    }  }}

Or via the CLI:

bash

claude mcp add --transport http quackr https://mcp.quackr.io/ --header "Authorization: Bearer YOUR_API_KEY_HERE"

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.

Source: README.md at commit 06f3b36

Tools

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Version history

v1.0.3LatestSep 16, 2026

Score

85% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

Reached in the last 30 daysRequired25 pts
Auth declaredRequired10 pts
Tools listed15 pts
Answer tools/list without a credential, or ship a package that starts in a sandbox without one.
DescriptionRequired15 pts
Logo10 pts
Documentation15 pts
License10 pts