Bovespa Cash Index is just a number that lets you track performance of the instruments comprising the index, so you can't invest in it directly. But you can buy Bovespa Cash Index futures or funds or invest in its components.
The lowest ever quote of Bovespa Cash Index is 57775 BRL. It was reached on May 18, 2017.
Bovespa Cash Index reached its highest quote on Dec 28, 2023 — 134520 BRL.