Add USDC and USDT to the FeeHandler contract

Proposal Description

This proposal aims to add both native USDC and USDT to the FeeHandler contract. Doing so will allow the correct distribution of tokens, as defined in the Great Celo Halvening proposal.

Proposed Changes

Fill out the following template for each transaction in the proposal

1. Adding USDC to the FeeHandler

• FeeHandler.addToken
• Data: address tokenAddress = 0xcebA9300f2b948710d2653dD7B07f33A8B32118C (USDC), address handlerAddress = 0xD3aeE28548Dbb65DF03981f0dC0713BfCBd10a97
• Value: 0

2. Adding USDT to the FeeHandler

• FeeHandler.addToken
• Data: address tokenAddress = 0x48065fbBE25f71C9282ddf5e1cD6D6A887483D5e (USDT), address handlerAddress = 0xD3aeE28548Dbb65DF03981f0dC0713BfCBd10a97
• Value: 0

The handlerAddress is the UniswapFeeHandlerSeller (0xD3aeE28548Dbb65DF03981f0dC0713BfCBd10a97), as the sells are not enabled this is not relevant, but the FeeHandler requires this address to be non-zero to handle the token properly.

Verification

A human readable version of this proposal can be found using the following command (on-chain ID determined after submission):

$ celocli governance:show --proposalID 254 --node https://forno.celo.org

Risks

As the tokens discussed in this proposal are well-known standard token process, there's no obvious risk worth flagging.

Useful Links

1. Token addresses documentation