All European tech companies I know compensate fairly well for oncall.

There's a rate for simply being on call (you'll get paid extra without even getting any calls), there's a rate that gets summed on top for actually working off hours and this rate increases depending on the time of the day you worked, whether it's the weekend or a holiday.

Yes, in Germany all months when you are expected to in the oncall rotation are basically an addendum to your usual contract that you sign and receive more money even if nothing ever happened during your shifts.