api-free.deepl.com
body parameter auth_key endpoint removal
Stopped working
Starting January 15, 2026, requests to api-free.deepl.com using the body parameter auth_key will fail. DeepL extended the deadline for this deprecation to that date. Any calls continuing to provide authentication through the request body will no longer be accepted.
Calls it hits
body parameter auth_key
What to use instead of these calls
Send the key in the Authorization header instead, using Authorization: DeepL-Auth-Key [yourAuthKey].
In api-free.deepl.com's words
Update: The deadline for this deprecation has been extended to January 15th, 2026.
Facts
- API
- api-free.deepl.com
api-free.deepl.com - Kind
- Endpoint removal
- Takes effect
- January 15, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
- Verified
- , against api-free.deepl.com's own pages
Questions
When does this change take effect?
Calls to body parameter auth_key on api-free.deepl.com stopped working on January 15, 2026.
What happens to calls after January 15, 2026?
They have failed since January 15, 2026.
How do I find the calls this hits in my code?
Okapi reads your repository, finds the calls this change hits and opens a pull request with the fix. It never commits to your branches: every change comes as a pull request you review.
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You fixed this one by hand.
Okapi opens the pull request with the fix before the next breaking change reaches your code.