Today, cryptocurrencies tumble after Israel launches air strikes on Iran. Payments giants like Visa and Mastercard slide and reports that retailers are looking to implement stable coins. And Max Bronzeberg of Coinbase breaks down the crypto exchanges new credit card in partnership with AMX.Welcome to CNBC's Crypto World. I'm Brandon Gomez. Digital currencies are under pressure as we head into the weekend.Driven lower by Israel's air strikes against Iran overnight. By noon Eastern, Bitcoin had recovered from ...