One new metric is the fees to move assets between various L2s using various bridges.
The most popular bridge right now seems to be Hop Protocol, which already supports Arbitrum, Optimism, Polygon and xDai.
The Hop UI displays two values that make up the bridging fee: the Bonder fee and destination transaction cost fee.
I’m hoping we can get some details about how these fees are derived, so that an adapter can be built to independently calculate these fees.