MCP.Market

Quackr MCP server

online · 100% uptime
by quackr.io·io.quackr/quackr·v1.0.3
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Virtual phone numbers for SMS verification, OTP receipt, and number management.

A86/100grade A
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Safety scan
A86/100

full report

Adoption
Growing

0 stars35 downloads/wk

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Quackr tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.9 · 2026-09-26 · same rubric, same numbers if you re-run it

no findings
  • Code scan2 source files scanned25/25
  • Live reliabilityremote reachable in 222ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityOAuth resource metadata advertised on 40115/15
  • Maintenancelast push 101 days ago8/15
  • Maintainer identitynamespace and repository owner differ; website matches verified namespace5/10
Overall 86/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Quackr compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
86/100
higher than 72% of 48,255 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
351 ms
faster than 42% of 30,031 servers
Downloads a week
35
more than 25% of 12,191 servers with a package

Install Quackr in Claude Code, Cursor or VS Code

claude mcp add --transport http quackr https://mcp.quackr.io/
Add to Cursor

What the publisher says

From the Quackr repository's README, as published. We do not edit it. Read it on GitHub

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 YOURAPIKEY header

Tools

Getting an API Key

  1. Sign in at quackr.io
  2. Open your profile page
  3. 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 YOURAPIKEY_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 claudedesktopconfig.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 YOURAPIKEY.

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 YOURAPIKEY 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.

Nothing above is checked by us. What we check is on the safety report.

Quackr: common questions

Is Quackr MCP server safe?
Yes, by our scan: it is graded A (86/100). Read the Quackr safety report
How do I install Quackr?
It runs remotely at mcp.quackr.io. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Quackr need an API key?
No key to paste: it signs you in with OAuth when your client connects.
Is Quackr maintained?
The last commit was 140 days ago (2026-06-17). The latest release is v1.0.3.
Is Quackr up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Quackr?
Servers from other publishers that do the same job: Nautilus Compass Memory MCP server.
How does Quackr compare with other MCP servers?
safety score 86/100 (higher than 72% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 351 ms (faster than 42% of 30,031 servers). Full comparison.

Alternatives to Quackr

Same job from other publishers: the closest match first, then the best rated.

  • Nautilus Compass Memory
    Local-first long-term memory for AI agents, with byte-recomputable signed verification receipts.
    B