Lucairn Privacy Gateway — MCP Server

EU-based privacy gateway for AI agents. Lucairn sits between your MCP-enabled client and upstream OpenAI or Anthropic models, pseudonymizes PII before the model sees it, and returns a signed verification receipt for each request.

Free Developer tier: 500 requests/month. Bring your own provider key with ANTHROPIC_API_KEY, OPENAI_API_KEY, or both. No credit card required.

Quick Start

npx -y @lucairn/mcp-server
The server speaks MCP over stdio and exposes one tool, chat_via_lucairn.

Configure Your MCP Client
Add this to your MCP config file, such as claude_desktop_config.json, cline_mcp_settings.json, or a Cursor/Continue MCP config:

{
  "mcpServers": {
    "lucairn": {
      "command": "npx",
      "args": ["-y", "@lucairn/mcp-server@latest"],
      "env": {
        "LUCAIRN_API_KEY": "<your_lucairn_api_key>",
        "ANTHROPIC_API_KEY": "<optional_byok_anthropic_key>",
        "OPENAI_API_KEY": "<optional_byok_openai_key>"
      }
    }
  }
}
Restart your MCP client. The chat_via_lucairn tool should appear automatically.

Get a Lucairn API Key
Create a free Developer account:

https://lucairn.eu/account/signup

Developer is BYOK and includes 500 requests/month through the hosted gateway.

What the Server Does
Your agent calls chat_via_lucairn with a messages-style payload: model, messages, max_tokens, and optional system / temperature.
Lucairn scans user content for personal data such as names, emails, IBANs, addresses, phone numbers, customer IDs, and similar identifiers.
Detected PII is replaced with placeholders such as [PERSON_1], [EMAIL_2], or [IBAN_3] before the request reaches the upstream model.
The upstream model receives only the sanitized prompt.
Lucairn returns the model response plus a signed verification receipt showing what was detected and pseudonymized.
Developer-tier responses keep placeholders visible. Pro and Enterprise can support relinking workflows.
Provider Routing
Lucairn routes from the model parameter and the BYOK keys you provide.

Model prefix	Routes to	Env var used
claude-*, anthropic-*	Anthropic	ANTHROPIC_API_KEY
gpt-*, openai-*, o1-*, o3-*, o4-*	OpenAI	OPENAI_API_KEY
Use any supported OpenAI or Anthropic model available to your provider account. If you only set one provider key, call models from that provider.

Links
Source: https://github.com/Declade/lucairn-sdks
npm: https://www.npmjs.com/package/@lucairn/mcp-server
Setup docs: https://lucairn.eu/developer/mcp
Sign up: https://lucairn.eu/account/signup
Verify receipts: https://lucairn.eu/verify
Glama listing: https://glama.ai/mcp/servers/Declade/lucairn-sdks
License
MIT — see https://github.com/Declade/lucairn-sdks/blob/main/LICENSE