UMIP 129 -Add GASETH-1221 as a supported price identifier

This UMIP will reference a synthetic token to be created with this price identifier. This token will be referred to as ‘uGAS’ and will represent the token that tracks this identifier with the most ETH volume on Sushiswap unless a different contract is determined by voters to be more legitimate.

This follows the exact same process as UMIP-22 but uses a different timestamp and methodology to calculate median gas prices. Full logic for this change is embedded in the Implementation section below.

The DVM should support requests for a price that resolves to either the median monthly Ethereum gas price or a 2-hour Time-Weighted Average Price (TWAP) on the highest volume Sushiswap ETH/uGAS-1221 pool. The price resolution method to use will depend on the the timestamp the price request was made at.