Payments used to be a quiet business of card swipes and bank wires. It is now contested ground between three kinds of company. The card networks move trillions: Visa and Mastercard, the two sets of rails almost every card payment rides on, and American Express, which owns the card and the network and the premium customer at once. The processors run the machines and software for merchants and banks: Fiserv, FIS, Global Payments, and Worldpay. The modern software players and crypto rails are rewriting how money moves: Stripe, Adyen, PayPal, Block, Marqeta, Circle, Coinbase, and Ripple. They all chase the same prize, a cut of every transaction and the trust to be the layer everyone else builds on.