The cost of running the 5etools server is covered by the advertisements run on, but if you wish to toss some spare gold at the development team (of one), you are welcome to do so. Direct donations are done through cryptocurrency for the safety of both parties; Coinbase is a reputable site where you can exchange money for crypto and carry out transactions.

BTC: 1Mj3SWAddbwq9X8yg155Fwt6Hd73K5WQsZ
ETH: 0x8247D70C092C9834790E580655Ab1FdEe26bdeee
LTC: MSUXsUS1DwejDvovb1NDtDsdErPF2d7Txb

Alternatively,Become a Patron