Amazon reportedly used a secret algorithm to jack up prices — A new report details Amazon’s Project Nessie pricing algorithm::Amazon deployed a secret algorithm to gauge how high it could raise prices before its competitors stopped increasing their prices as well.
YSK this data is not entirely accurate. It relies entirely on Amazon's API, which has been problematic in the past.
Still a useful tool, nonetheless.
That API you are describing is not active anymore. Hasn't been in a long time.
Keepa has to scrape Amazon data themselves.