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Every request to the ENS Ads API must include your API key as a Bearer token in the Authorization header. There are no cookies, query-string parameters, or session-based alternatives — the header is the only accepted mechanism. You can obtain your API key from the ENS Ads dashboard.

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Header format

Include the following header with every request, replacing YOUR_API_KEY with your actual key:
Never include your API key in client-side or user-facing code. Requests should always originate from your server so the key is never exposed in a browser, mobile app, or public repository.

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Code examples

The examples below show how to attach the Authorization header in three common environments.
Store your API key in an environment variable (for example, ENS_ADS_API_KEY) and read it at runtime. Avoid hardcoding keys in source files or committing them to version control.

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Authentication errors

If your key is missing or invalid, the API returns a 401 Unauthorized response:
Check that the Authorization header is present, the token is prefixed with Bearer , and the key itself is correct. If the problem persists, generate a new key from the dashboard.