The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
This contract lives in this repository. And it's purpose is to simplify the carbon offsetting process.
Currently, the OffsetHelper is only deployed on Polygon.
What it does in more exact terms is it abstracts the process of retiring TCO2, which normally looks like so:
The user only needs to hold USDC, WETH or WMATIC or MATIC and interact with the OffsetHelper contract which takes care of executing all the above steps in a single transaction.