The parrots and the monkeys are the only real experiments here, at least that I’m aware of, while the rest are extrapolation from currently known behaviors.

https://www.smithsonianmag.com/science-nature/parrots-share-currency-help-their-pals-purchase-food-180973917/

https://www.zmescience.com/research/how-scientists-tught-monkeys-the-concept-of-money-not-long-after-the-first-prostitute-monkey-appeared/

We truly are related to monkeys