CoinJar is a centralised digital currency exchange with the main function to facilitate the trading of cryptocurrencies by its users and allow to convert these assets into cash.

[3] The company originated in Melbourne, Australia, through a startup accelerator program and secured initial funding from Blackbird Ventures along with contributions from angel investors.

CoinJar facilitates trading by matching buy and sell orders on its platform and enables users to convert cryptocurrencies into fiat currencies for withdrawal.

[13] CoinJar generates revenue primarily through a transaction fee on the exchange of Bitcoin into standard currencies and vice versa.

[7][19][20] CoinJar was among the first cryptocurrency companies in Australia to sponsor a sports team, namely the Melbourne Demons of the Australian Football League (AFL) in May 2021.