CatchDoms — Expired Domains API vs Heimdall MCP

In-depth architectural comparison of the CatchDoms — Expired Domains API and Heimdall MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose CatchDoms — Expired Domains API when:

• You need dedicated capabilities in the Monitoring domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: API Key required (Freemium).
• Primary tools included: search_domains, get_domain, list_filters.

Explore CatchDoms — Expired Domains API Details

Choose Heimdall MCP when:

• You need dedicated capabilities in the Monitoring domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: read_file, read_text_file, read_media_file.

Explore Heimdall MCP Details

Feature & Specification Comparison

Specification	CatchDoms — Expired Domains API Monitoring	Heimdall MCP enmanuelmag Monitoring
Summary	Search 40K+ expired domains from 12 auction platforms with SEO metrics and scores.	Transparent proxy for any MCP server that intercepts all JSON-RPC messages, measures latency, and stores traces in SQLite, PostgreSQL, or MySQL. Exports OpenTelemetry (OTLP) spans to Jaeger, Tempo, or Grafana. Supports stdio, HTTP, and SSE transports. npx @cardor/heimdall-mcp
Category & Scope	Monitoring

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "catchdoms-expired-domains-api": {
      "url": "https://catchdoms.com/mcp/catchdoms/free"
    }
  }
}

{
  "mcpServers": {
    "enmanuelmag-heimdall-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-filesystem"
      ]
    }
  }
}

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