The authorization to trade on fapi.binance.com/fapi/v1/ was spontaneously toggled off on my primary API key; the error message that flooded my logfile was:
Invalid API-key, IP, or permissions for action
As I 'm a verified user from Italy, where derivative trading was clarified to be illegal sometime in August, I thought this was the end for me. But after finding those errors in my logfile, I searched for news regarding the introduction of additional restrictions on Binance concerning legal compliance. I couldn't find any. Then I toggled the authorization back on and the API resumed working.
Hopefully this wasn't some preliminary test.