deCashed accepts SOL as a form of payment for its May 11th event in New York City. While the checkout process is a tiny bit clunkier because it involves sending an email afterwards to confirm, the process of sending the funds is super simple. Got a Solana wallet? In my quick live tutorial, I use the Phantom app to register for deCashed but any Solana wallet will work.
Since no other information is sent with the payment, you just have to email us at email@example.com afterwards to tell us what wallet address you send it from, along with your full name so that your entry will be simple on May 11th.