Base

The basic network of the second layer has low fees and high speed. Transactions in this network are processed off-chain (outside the main chain), which increases the speed and reduces the cost of transactions. 

This free mint refers to the high speed of transactions

The basic network of the second layer has low fees and high speed. Transactions in this network are processed off-chain (outside the main chain), which increases the speed and reduces the cost of transactions. 

This free mint refers to the high speed of transactions https://farcaster.manifold.xyz/frame/12695792

I will research more about it, thank you.