# SIP-236: Fix Exchange before fee reclaimation evaluation

Author Daniel Beal Implemented Governance Ethereum & Optimism MEB (@barrasso) Alpheratz Loading status... 2022-05-11

## Simple Summary

Exchanger.exchange does not use the post-reclaim amount to calculate the amount of exchange for the user trade. This leads to the user being left with more of their source token then they should have had.

## Abstract

Exchanger.exchange does not use the post-reclaim amount to calculate the amount of exchange for the user trade. This leads to the user being left with more of their source token then they should have had.

A similar bug has been found ExchangerWithFeeRecAlternatives that would affect L1, and will be similarly patched.

### Tests

In Exchanger tests, the following are added:

• settlement tests