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How can companies invest in crypto? Business account to move Fiat into Crypto

Your DEX operations are easy but getting the funds into crypto is the challenge as you are using company money. It will have to be accounted for.
On CEX operations you can just open an account with Kraken Corporate in your company name and they will easily onboard you. Then you can move between any CEX or DEX you wish.
 
You can open a kraken account, get verified to the highest level and exchange both ways as you like!