Quackr

Name: Quackr
Author: quackr-mcp

by quackr-mcpversion 1.0.3i★ 0iComputer or cloud

Registry nameio.quackr/quackr

How to install

What it does

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

Connects Computer or cloud
Account or key Cloud: Needs Authorization · Local: Needs QUACKR_API_KEY
Category Chat & email

Install

Pick the AI app you use, then copy the settings.

Passed 5/5 checks · What you ask goes through the maker’s server (mcp.quackr.io) · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 5 min

You need a Quackr key (create it on the maker’s site) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it

Sign up and create a Quackr key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Quackr site ↗
Done
Open Claude’s Connectors page
CustomizeConnectors
Done
Click “Add” → “Custom” → “Web” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameQuackr
Remote MCP server URL · Addresshttps://mcp.quackr.io/
Under Request headers, add this name and value
Header nameAuthorization
ValueBearer <paste your key here>
Paste the key only into the app’s field, never into a chat or to anyone
Click Continue past the sign-in settings Claude detected · under Authentication choose what the maker says (Sign in now, Sign in when needed or No sign in), then click Add
Done
Turn it on in a chat
+ConnectorsQuackr
Done
Try it
Use Quackr and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Quackr or shows a Quackr tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect Quackr yet

Quackr needs your own key to connect, but OpenAI’s help page only describes OAuth sign-in; there is no key option we could verify

What you can do instead

A · Use an app that can connect Quackr

Steps for Claude →You need a Quackr key (create it on the maker’s site) · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it
Steps for Claude Code →You need a Quackr key (create it on the maker’s site)
Steps for Cursor →You need a Quackr key (create it on the maker’s site)
Steps for VS Code →You need a Quackr key (create it on the maker’s site)

B · Others in Chat & email that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

HyperFrames by HeyGen✓ ChatGPT
Inbox Zero✓ ChatGPT
draw.io✓ ChatGPT

Works with Claude Code · about 5 min

You need a Quackr key (create it on the maker’s site)

Sign up and create a Quackr key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Quackr site ↗
Done
Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done
3
Paste this command and press Enter
```
claude mcp add --transport http --scope user quackr https://mcp.quackr.io/ --header 'Authorization: Bearer your-value'
```
Replace “your-value” with your key before pressing Enter
Paste the key only into the app’s field, never into a chat or to anyone
Done
Type /mcp in Claude Code
You should see Quackr listed as connected
Done
Try it
Use Quackr and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Quackr or shows a Quackr tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 5 min

You need a Quackr key (create it on the maker’s site)

Sign up and create a Quackr key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Quackr site ↗
Done
Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Fill in your key
In the Quackr settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Quackr and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Quackr or shows a Quackr tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 5 min

You need a Quackr key (create it on the maker’s site)

Sign up and create a Quackr key
Open the maker’s site, sign up and create an API key for the next step. Check the maker’s site for pricing and free plans.
Open the Quackr site ↗
Done
Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Fill in your key
In the Quackr settings, Authorization is empty; add your key and save
Paste the key only into the app’s field, never into a chat or to anyone
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Quackr and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Quackr or shows a Quackr tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://mcp.quackr.io/

JSON settings are under “For developers” below

Stuck? Ask people who use Quackr💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport http --scope user quackr https://mcp.quackr.io/ --header 'Authorization: Bearer your-value'

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "quackr": {
      "url": "https://mcp.quackr.io/",
      "headers": {
        "Authorization": "Bearer your-value"
      }
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "quackr": {
      "type": "http",
      "url": "https://mcp.quackr.io/",
      "headers": {
        "Authorization": "Bearer your-value"
      }
    }
  }
}

Installed on your computer

Claude Code

claude mcp add --scope user quackr --env QUACKR_API_KEY=your-value -- npx -y quackr-mcp

Claude Desktop (claude_desktop_config.json)

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

Cursor (~/.cursor/mcp.json)

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

VS Code (mcp.json)

{
  "servers": {
    "quackr": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "quackr-mcp"
      ],
      "env": {
        "QUACKR_API_KEY": "your-value"
      }
    }
  }
}

Values you fill in

QUACKR_API_KEY secret required env
Your Quackr API key, from your profile page at quackr.io
Authorization secret required HTTP header
Bearer token in the form 'Bearer ', from your profile page at quackr.io

Descriptions are as written by the maker.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub stars i: 0
Downloads per weeki: 64/wk
Verified domain: ✓ quackr.io
Licence i: MIT
Connection: Computer or cloud
Transport: stdio, streamable-http
Latest versioni: 1.0.3
Categoryi: Chat & email
Published to registryi: Jun 18, 2026
Code last changedi: Jun 17, 2026
Maker: quackr-mcp
Packages: npm: quackr-mcp
Repo: quackr-mcp/quackr-mcp
Website: quackr.io
Registry status: Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

Claude Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

Run on your computer in

All apps, with pros and cons →

What it can do

The server asks you to sign in before it lists its tools.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 14, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain quackr.io (the registry checks domain ownership)
✓ Pass
Still maintained
Code last changed 5 months ago
✓ Pass
Has a licence
Uses MIT
✓ Pass
Endpoint responds
Responded in 199 ms (HTTP 401)
✓ Pass
Sign-in with OAuth
Declares OAuth sign-in, so your AI app can take you to log in
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Chat & emaili

More stars than 0% of the other 2037 servers in this category
Published to the registry more recently than 11% of the other 2037 servers in this category
Basic checks equal to or better than 100% of the other 2037 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Quackr safe?

It passed 5 of 5 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: Authorization, QUACKR_API_KEY

Does it run on my computer or in the cloud?

Either way works: install it on your computer or connect to the cloud version.

Is it still maintained?

The GitHub repo last changed 5 months ago, and the latest version (1.0.3) reached the registry 5 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT on the web (full MCP on Business and above; Pro read-only).

What can I use instead?

In the same category: HyperFrames by HeyGen, Inbox Zero, draw.io

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

HyperFrames by HeyGen

Official HyperFrames by HeyGen: the best AI video editor in chat. Captions, motion graphics, MP4.

by heygen-comWidely used★ 83.9KUpdated today

Runs in the cloud

How to connect

Inbox Zero

Search Gmail and Outlook, save drafts, manage email rules, and view email stats.

by elie222Widely used★ 13KUpdated 44 days ago

Runs in the cloud

How to connect

draw.io

Create draw.io diagrams in chat from Mermaid or XML, shown live and interactive. 10,000+ shapes.

by jgraphWidely used★ 5.8KUpdated 4 days ago

Runs in the cloud✓ service owner · draw.io

How to connect

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

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_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.

"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: support@quackr.io

License

MIT — see LICENSE.

Quackr

What it does

Install

Sign up and create a Quackr key

Open Claude’s Connectors page

Click “Add” → “Custom” → “Web” and fill in these 2 fields

Turn it on in a chat

Try it

What you can do instead

Sign up and create a Quackr key

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Sign up and create a Quackr key

Click this button to open Cursor

Fill in your key

Open the AI chat in Cursor in Agent mode

Try it

Sign up and create a Quackr key

Click this button to open VS Code

Fill in your key

Open the AI chat in VS Code in Agent mode

Try it

Over the web

Installed on your computer

Values you fill in

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Chat & emaili

Common questions

Others in the same category

HyperFrames by HeyGen

Inbox Zero

draw.io

README from the maker

Quackr MCP Server

Tools

Getting an API Key

Install via npm

Claude Code Setup

Claude Desktop Setup

Other MCP Clients

REST API

Support

License