StreetPricer is built with the latest Amazon Selling Partner (SP)-API and cloud computing. Unless the repricer you use or evaluate was built in 2021 or later, it would be based on the legacy MWS technology, which is due to be phased out starting 2022.
Amazon’s official statements on SP-API replacing MWS:
“Yes, over time the legacy Amazon MWS sections will be deprecated and you will need to migrate to SP-API to continue service.”
“We recommend that you start integrating with SP-API immediately and complete your migration from Amazon MWS to SP-API as early as possible.”