DeepL API · Endpoint removal
The auth_key query parameter stops working
Stopped working
Calls to query parameter auth_key on DeepL API stopped working on January 15, 2026.
What to use instead of these calls
Send the key in the Authorization header: Authorization: DeepL-Auth-Key [yourAuthKey].
Calls it hits
query parameter auth_key
Update: The deadline for this deprecation has been extended to January 15th, 2026.
Facts
- API
- DeepL API
api.deepl.com - Kind
- Endpoint removal
- Takes effect
- January 15, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
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