First exchange ETH to GRAM and back. We use Telegram Open Network
We just allow you to exchange and receive GRAMS to ETH, BNB, WAVES using hash locks.
Also we integrated ChainLink and Torus to our project.
See it at berlin.buttonwallet.tech
Demo 1: https://youtu.be/9Ewq6R1Af3g
Dempo 2: https://youtu.be/upB2up8J3lc