API Keys - LLM Cache

API keys authenticate requests to the localization API and the MCP server. Each key is scoped to an organization and has access to all engines within it.

Creating a key#

Create API keys from the API Keys page in the dashboard. Each key requires a name to identify its purpose (e.g., "CI/CD pipeline", "MCP server", "Staging environment").

Key visibility

The full API key is shown only once at creation. Copy and store it securely - it cannot be retrieved after you close the dialog.

Using a key#

Pass the API key in the X-API-Key header on every request:

bash

curl -X POST https://api.lingo.dev/process/localize \
  -H "X-API-Key: your_api_key" \
  -H "Content-Type: application/json" \
  -d '{"engineId": "eng_abc123", "sourceLocale": "en", "targetLocale": "de", "data": {"greeting": "Hello"}}'

The same key works for both the localization API and the MCP server.

Security#

Keys are stored as hashes - Lingo.dev cannot retrieve your key after creation
Keys are scoped to a single organization
Deleting a key immediately revokes access
There is no limit on the number of keys per organization

Next Steps#

API Reference

Use your API key to call the localization endpoints

MCP Server

Configure the MCP server with your API key

Team

Manage who has access to your organization