Gasless USD₮0 Demo

This project demonstrates a gasless token-transfer flow on the Flare Network using a two-piece architecture:

1. Front-end (React + Ethers.js)

   • Presents a simple UI: a “recipient” field, an “amount” field, and a “Send Gasless” button.
   • Builds an EIP-712 “transferWithAuthorization” payload off-chain (including timestamps, nonce, etc.).
   • Prompts the user’s wallet (e.g. MetaMask) for an EIP-712 signature of that payload—no gas needed from the user at this step.
   • Sends the signed payload to the relayer via a POST request.

2. Relayer (Express + Ethers.js)

   • Listens for /relay-transfer requests.
   • Verifies and submits the user’s signed “transferWithAuthorization” on-chain by calling the USD₮0 contract’s transferWithAuthorization(...) method, paying the FLR gas itself.
   • Returns the resulting on-chain transaction hash back to the front-end.

This setup lets end users move USD₮0 tokens without holding any FLR—they only sign a message, and the relayer covers the gas.