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We introduced the ability to use #DeepL (Free/Pro) but that might be unclear if you just discovered DeepL.
DeepL allows you to use their api with a paid plan (around 7 euros a month).
It's also possible to get a free key with the dev entry.
With #Fedilab we allowed both entries (API URLs are different).

For having a key

Developer: https://www.deepl.com/pro#developer

Individual:
https://www.deepl.com/pro#team

PS: there is no partnership with DeepL, otherwise we will have asked a key for the app.