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GHOPAY - Smart Contracts

This directory contains the smart contracts related tests, utilities and deployment addresses for the Payment Settlement.

How does it work ?

The smart contracts themselves have essentially three tasks:

  1. Verify the user signature that was passed in by the Gelato relay in terms of amount and receiver
  2. Use user signature to pull in GHO
  3. Swap a fraction of the GHO for gas fee token (usually eth / native token) expected by relay
  4. Pay the relay
  5. Transfer remaining Gho to the receiver

Installation

yarn install

Run tests

yarn test

Sepolia Deployment

Warning:

Note that on Sepolia we have deployed the PaymentSettlementTestHarness contract which extends the PaymentSettlement with some unsafe methods added for testing purposes. One should NEVER deploy this version of the contract on a network were it will handle actual value.

Run Deploy:

Delete deployment outputs of previous deployment if you want to redeploy: rm -rf deployments/sepolia

Deploy on actual sepolia: deploy:sepolia --network sepolia

Test deploy on local fork: deploy:sepolia --network localhost

Send Payment (on Sepolia)

You can use the payment script to send a GHO payment gaslessly via the Gelato relay. For this you will have to:

  1. Adjust the receiver and amount variables in the script to your liking
  2. Make sure you have set the SEPOLIA_PRIVATE_KEY environment variable to the private key of an account with sufficient GHO tokens on sepolia
  3. Run yarn send-payment:sepolia to make the payment
  4. Wait for the script to finish. In the success case the last emitted logs should llook something like this:
Task Status {
  chainId: 11155111,
  taskId: '0xaa31e9ec7dc88958e8d263b59575b2c22452985815552c4e189baa11e7141104',
  taskState: 'ExecSuccess',
  creationDate: '2024-01-14T06:51:54.367Z',
  transactionHash: '0xa38b90e8af1f66425961e3e09deca5bc184b94cf10be95535893338ce7dcf1c9',
  executionDate: '2024-01-14T06:52:01.839Z',
  blockNumber: 5083156,
  gasUsed: '295101',
  effectiveGasPrice: '153284042'
}