Coinbase has agreed to purchase cryptocurrency investing platform Echo for $375 million.By completing this form, you agree to receive marketing communications from PYMNTS and to the sharing of your information with our sponsor, if applicable, in accordance with our Privacy Policy and Terms and Conditions .Complete the form to unlock this article and enjoy unlimited free access to all PYMNTS content — no additional logins required.The deal, announced Tuesday (Oct. 21), is the latest in a string of acquisitio ...