Pretty Derby or UmaMusume is a Japanese mobile gacha game adapted from the anime of the same name. You can use
Pretty Derby gems to recruit those racing-horse girls based on real-life racehorses. The Gems can also be used to buy resources for training the horse girls.
To top up Pretty Derby gems, you can choose to top up through the in-game store or find a third-party online trading platform. Considering cost performance and convenience, third-party online marketplaces are a fairly good choice.
The promotions they hold from time to time allow you to top up Pretty Derby gems at a lower price than the original, and they will also support more payment methods to facilitate players who are not within the scope of the game's release to top up UmaMusume. Not only that, you don't even need to log into your account when you top up Pretty Derby Gems on the online marketplaces, because they usually only require the trainer ID of the corresponding account.