No, the American Express Platinum card doesn't have any preset spending limit, but that does not give cardholders unlimited purchasing power. It means American Express won't give you a specific credit limit once you're approved for the card.

A common misconception about the American Express Platinum Card is that it has "unlimited" spending, but in reality, it has No Pre-Set Spending Limit (NPSL). This is fundamentally different from having no limit at all. While the card does not have a static credit limit like a traditional credit card, your purchasing power is dynamically adjusted based on several factors: your payment history, your credit record, and your known financial resources. Amex uses sophisticated algorithms to determine how much you can spend at any given moment. If you suddenly try to make a $50,000 purchase when you normally spend $2,000 a month, the transaction may be declined unless you have alerted them in advance. You can use the "Check Spend Ability" tool in the Amex app to see if a specific large purchase will be approved. Furthermore, because it is a charge card (though it now features "Plan It" and "Pay Over Time" options), the expectation is generally that you will pay the balance in full each month. So, while you can potentially spend much more than a standard credit card would allow, the "limit" is an invisible, shifting boundary controlled by your own financial behavior and Amex's risk assessment.