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io.github.capsolver-ai/capsolver-mcp

Official registry AI and agents

MCP Server for CapSolver - captcha-solving capabilities for AI agents

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

PYPI package capsolver-mcp
Claude Code 
claude mcp add capsolver-mcp -e 'CAPSOLVER_API_KEY=<your capsolver_api_key>' -- uvx capsolver-mcp==0.1.3
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "capsolver-mcp": {
            "command": "uvx",
            "args": [
                "capsolver-mcp==0.1.3"
            ],
            "env": {
                "CAPSOLVER_API_KEY": "<your capsolver_api_key>"
            }
        }
    }
}

Environment variables

  • CAPSOLVER_API_KEY required secret Your CapSolver API key

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. capsolver-mcp
  2. Install
  3. Usage
  4. Configure in Claude Desktop
  5. Available tools
  6. Development
  7. License

capsolver-mcp

MCP Server for CapSolver — expose captcha-solving capabilities to AI agents via the Model Context Protocol.

Published on PyPI as capsolver-mcp and listed in the official MCP Registry as io.github.capsolver-ai/capsolver-mcp.

See the capsolver-ai-hub repo for integration examples and the full documentation.

For detailed MCP client setup (Claude Desktop, Claude Code, Cursor, Windsurf, Cline, and more), see docs/mcp-integration.md.

Install

pip install capsolver-mcp
pip install capsolver-mcp[browser]   # with Playwright support (for detect/solve_on_page)

All tools read the API key from the environment:

# bash / zsh
export CAPSOLVER_API_KEY="your-capsolver-api-key"

# PowerShell
$env:CAPSOLVER_API_KEY = "your-capsolver-api-key"

# cmd
set CAPSOLVER_API_KEY=your-capsolver-api-key

Usage

CLI
# stdio (default — for local MCP clients like Claude Desktop)
capsolver-mcp

# SSE (for remote / HTTP access)
capsolver-mcp --transport sse --host 0.0.0.0 --port 8000

# Streamable HTTP (MCP 2025-03-26 spec)
capsolver-mcp --transport streamable-http --host 0.0.0.0 --port 8000
CLI options
capsolver-mcp [OPTIONS]

  --transport {stdio,sse,streamable-http}
                              Transport protocol (default: stdio)
  --host HOST                 Bind host for SSE/HTTP transports (default: 127.0.0.1)
  --port PORT                 Bind port for SSE/HTTP transports (default: 8000)
  --api-key KEY               API key (fallback: CAPSOLVER_API_KEY env)
  --name NAME                 Server name (default: capsolver)
Programmatic
from capsolver_mcp.server import create_server

server = create_server(
    api_key="your-key",       # or set CAPSOLVER_API_KEY env var
    server_name="capsolver",  # name advertised to MCP clients
    host="127.0.0.1",         # bind host for SSE / HTTP transports
    port=8000,                # bind port for SSE / HTTP transports
)
server.run(transport="sse")   # or "stdio" or "streamable-http"

Note: host and port are constructor parameters on create_server() (forwarded to FastMCP), matching the MCP Python SDK 1.x API.

Configure in Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "capsolver": {
      "command": "capsolver-mcp",
      "env": {
        "CAPSOLVER_API_KEY": "your-key"
      }
    }
  }
}

To run without installing it globally, use "command": "uvx" with "args": ["capsolver-mcp"] — this is what MCP clients generate from the registry entry. See docs/mcp-integration.md for per-client examples.

Available tools

ToolBrowser?Description
solve_captchaNoSolve a captcha by type + site params (token mode)
detect_captchasYesScan a page URL and list present captcha types
solve_on_pageYesDetect + solve + autofill all captchas on a page
get_balanceNoCheck account balance and packages
get_supported_captchasNoList all supported captcha types and handlers

Browser-based tools (detect_captchas, solve_on_page) require the browser extra:

pip install capsolver-mcp[browser]
playwright install chromium

Development

git clone https://github.com/capsolver-ai/capsolver-mcp.git
cd capsolver-mcp
uv sync --all-extras          # or: pip install -r requirements-dev.txt
uv run pytest                 # run tests
uv run ruff check src tests   # lint

License

MIT

Frequently asked questions

What is io.github.capsolver-ai/capsolver-mcp?

MCP Server for CapSolver - captcha-solving capabilities for AI agents

How do I install io.github.capsolver-ai/capsolver-mcp?

It runs on your machine. In Claude Code: claude mcp add capsolver-mcp -e 'CAPSOLVER_API_KEY=<your capsolver_api_key>' -- uvx capsolver-mcp==0.1.3. For other clients, paste the JSON configuration from this page into their MCP settings.

Does io.github.capsolver-ai/capsolver-mcp need an API key?

Yes. It expects CAPSOLVER_API_KEY, which you set in its configuration.

Is io.github.capsolver-ai/capsolver-mcp open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains io.github.capsolver-ai/capsolver-mcp?

It is published by capsolver-ai. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.