The U.S. credit-card industry’s newest growth engine is the twenty-something. American Express raised its Platinum annual fee by $200 to $895 last year and Chase lifted the Sapphire Reserve from $550 to $795, redrawing the top of the market and carving out a “near-premium” tier of cards priced from $325 to $395. The tier is built for the consumer who won’t pay $900 but will pay $325 — and the issuer profit engine behind it has been the engine behind this summer’s American Express earnings, too.

Amex says its average Gold cardholder is 29; the average Platinum cardholder is 33. The company redesigned the Gold card in recent years to lean on dining and takeout credits at Dunkin’ and Five Guys — categories a 25-year-old uses every week, which means a 25-year-old swipes the card every week, which means the issuer earns every week. Christophe Le Caillec, Amex’s chief financial officer, called Gold the “favorite product” of Gen Z at an industry conference and meant it as a win for the marketing department, not the cardholder. “Cracking that nut and having American Express being relevant to this very large and growing population,” he said, “was a major breakthrough for us.”

Airlines have read the same memo. Alaska Airlines launched its Atmos Rewards Summit card at $395 last year after merging its rewards program with Hawaiian’s; American Airlines and Citi rolled out a card at $350; Southwest and Chase have a higher-end product on the books for next year, a step-change up from Southwest’s current consumer cards at $99 to $229. Brett Catlin, Alaska’s senior vice president of network, partnerships and loyalty, was candid about the math: “Most consumers aren’t going to have two $800, $900 credit cards.” The $800-and-up market is full. The $325-to-$395 market is not.

Capital One’s Venture X is priced at exactly $395 and the marketing is built around a customer who “does the mental math,” as Capital One’s Lia Dean, the company’s president of banking and premium products, put it. The “mental math” is the trick. Customers get to feel sophisticated while running calculations the issuer has already optimized. A recent profile of the cohort found Skye Zhao, a 25-year-old doctoral student in New York who couldn’t justify $895 for a Platinum but concluded the Gold’s $325 fee would earn back in travel points, and Katie Suiters, a 38-year-old media trainer in McLean, Va., who upgraded to the Venture X after noticing more Capital One airport lounges featuring chef José Andrés and called the $395 fee “1,000% worth it.”

Even the skeptics on the analyst side confirm the structure. Ted Rossman, principal consumer finance analyst at the credit-counseling organization Money Management International, called the new tier “the upper-middle-class option” and then undercut the pitch: in many cases, he said, near-premium perks offer only marginal upgrades over cheaper cards, and the fees often do not pay back.

That caveat tends to disappear inside the issuer marketing, where the cards are sold as small luxuries rather than small debts. The Platinum at $895 and the Sapphire Reserve at $795 are flagship anchors — they make everything beneath them feel reasonable. The Gold at $325, the Atmos Summit at $395, the Venture X at $395, and the Southwest-Chase card coming next year are where the volume lives, because Gen Z and younger millennials will do the math at this price band and not at the top one. Issuers have learned how to monetize a generation before it learns to price risk. That is the breakthrough Le Caillec was celebrating.