Module erc20 

The ERC-20 calls a bridge or a Core link needs: transfer (USDC into the Arbitrum bridge, a token back to Core through its system address), balanceOf, approve, decimals and symbol, and their answers.

Constants

APPROVE

approve(address,uint256).

BALANCE_OF

balanceOf(address).

DECIMALS

decimals().

SYMBOL

symbol().

TRANSFER

transfer(address,uint256).

Functions

approve

approve(spender, amount).

balance_of

balanceOf(owner); its answer reads with read_amount.

decimals

decimals(); its answer reads with read_decimals.

read_amount

A uint256 answer: a balance or an allowance.

read_decimals

The uint8 decimals() answers.

read_symbol

The string symbol() answers.

symbol

symbol(); its answer reads with read_symbol.

transfer

transfer(to, amount), the amount in the token’s own units.