Floyd Mayweather is undoubtedly the richest boxer in history with a net worth of $340M in 2016 after Forbes  and his win over MMA star Connor McGregor was a historic moment in the world of Boxing ( and MMA).

This being said, Mayweather is a smart investor too and is currently promoting some Crypto’s.
His recent posts in Instagram seems to be explaining this:

in his Instagram post he was mentioning Centra , a payment card that supports a wide range of cryptocurrencies across various blockchains. The assets currently supported are: Bitcoin, Ethereum, Litecoin, ERC20 Tokens, Ripple, Zcash, and Dash  ,interested readers may take a look at their site, as they are launching an ICO,

previously, he was writing in his Instagram account that he will make money during ICO of STOX , another crypto project.

This is becoming a trend for Celebrities to promote and invest in Fintech ,be aware that there are risks in any kind of investments and we recommend you to look for advice from consultants you trust and read fintech news.