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1. Get a workspace API key

MailKatana developer docs assume you already have a workspace-scoped API key. Use that same key for both the REST API and the MCP server.

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2. Make your first REST request

Create a contact with a Bearer token: 
curl -X POST https://api.mailkatana.com/v1/contacts/create \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "avery@example.com",
    "firstName": "Avery",
    "lastName": "Stone",
    "source": "docs-quickstart"
  }'

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3. Verify MCP authentication

MailKatana serves MCP over SSE. If your client wants the raw SSE endpoint, verify it like this: 
curl -i https://api.mailkatana.com/mcp/sse \
  -H "Authorization: Bearer YOUR_API_KEY"
With a valid key you should get an SSE response instead of a 401 error. If you omit the header and still get 401, that means the endpoint exists and auth is the missing piece.

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Next steps