Relay swap UDC to ETH

This project demonstrates how to call Pyth network Entropy contract using a SponsoredCall request In order to do so, we will transfer USDC to the contract with the relayer using the permit(), swapping on-chain USDC for ETH using PancakeSwap router and finally calling entropy.requestWithCallback{value: pythFee}

1. Calling Permit and transfer

     token.permit(owner, address(this), fee, deadline, v, r, s);
     token.transferFrom(owner, address(this), fee);
   

2. Swapping the USDC for ETH with exact ETH amount

    router.swapTokensForExactETH(
         pythFee,
         fee,
         path,
         address(this),
         deadline
     );
   

3. Requesting Entropy Randomnumber

     address provider = entropy.getDefaultProvider();
     uint64 sequenceNumber = entropy.requestWithCallback{value: pythFee}(
         provider,
         randomNumber
     );
   

Tests

We are forking arbitrum using USDC, the Pancake Router

Single call

In this test we are mocking the sponsoredCall calling increment() method and checking that the entropy contract balance should increase with the entropy fee

Multiple call

In this test we are mocking the sponsoredCall calling the multiCallIncrement() sending two txs, and checking that the entropy contract balance should increase with 2 x entropy fee

Quick Start

1. Install dependencies

   yarn install
   

2. Compile smart contracts

   yarn run hardhat compile
   

3. Run unit tests

   yarn run hardhat test