[Proposal] BAL for Gas on Balancer V2

This proposal also appears on Balancer's forum.

On behalf of the Balancer community, I’d like to propose we include V2 trades in the BAL for Gas program.

Proposal

The mechanics to determine eligible transactions and BAL amounts would be the same as in V1, except:

1. In addition to the Exchange Proxy, transactions sent to the Vault would qualify for the program (the Exchange Proxy only connects trades to V1 pools)
2. The gas amount to be reimbursed for trades through the V2 Vault would be defined as:
   • 90,000 gas for transactions containing one swap
   • 140,000 gas for transactions containing two or more swaps.

As V2 goes live and we start collecting more data, we would possibly review those amounts and create specific tiers for transactions containing three or four swaps.

Motivation

The BAL for Gas program has become an important mechanism for distributing Balancer protocol governance power to one of its widest user bases: traders. With the launch of Balancer V2, it is only fair that users who have their trades routed through V2 pools get the same treatment as those who go through V1.