Burner Wallet
Burner Wallet is a DApp on Ethereum blockchain that helps in moving funds quickly and intuitively.
It is also listed on @stateofthedapps official website here: https://www.stateofthedapps.com/dapps/burner-wallet.
The xDai.io is running on the xDai newtwork, which is a hard spoon of Ethereum. So you are actually paying your gas and everything in Dai. It's five second block time, so it's super quick.
Use
In use, xDai.io is very simple and easy to use. There's no wallet, there's no seat phrase, there's no download.
Basically you just point your phone camera at xDai.io bar code if you want to receive your funds.
Stats
Seems like the activities are getting populated on Burner Wallet.
Here are some stats from stateofthedapps.com updated on April 2nd, 2019.
Check the details on https://www.stateofthedapps.com/dapps/burner-wallet.