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The fine for riding an e-scooter too fast in a pedestrian zone typically runs between 20 to 50 euros, but it can vary depending on the federal state and whether anyone was endangered. Some cities are stricter about it, others less so - it really depends on what the local regulations look like and how enforcement works. Best thing to do is check what speed limit applies in your city and whether there are any special rules for e-scooters at all, since it's not regulated the same way everywhere.
A friend of mine got caught with an e-scooter in a pedestrian zone in my city and had to pay 25 euros - the police said she was going way too fast, but there was no actual danger. Like others have already mentioned, the fine is somewhere in the lower two-digit to low three-digit range, but it really depends on which state you're in and whether you actually endangered someone or were just going too fast. In some areas the local authorities are stricter, in others you're more likely to just get a warning without a fine.
In some states it can get even more expensive if you endangered others while doing it - then it can easily be 50 euros or more. It's also important to know that local authorities in your city can be stricter or more lenient, so you should check beforehand how fast you're allowed to ride there.
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