Brex can genuinely be inexpensive, but “Brex costs $0” is only accurate for a narrow use case. Essentials currently starts at $0 per user per month, and Brex does not normally add its own fee to domestic card transactions. For a small, mostly domestic company that can stay on Essentials, direct platform cost can be very low.
The economics change as the organization grows. Premium is $12 per user per month before applicable tax. Enterprise and Smart Card require custom quotes. International card conversion can add an FX markup of up to 3%. Paid plans can include user overages, and Premium/Enterprise/Smart Card travel can include trip fees. International wires can also pick up intermediary or recipient-bank fees even when Brex itself charges no wire transaction fee.
The best way to evaluate Brex is therefore not to ask whether the card has an annual fee. Ask what the full finance stack costs for your company: software, users, travel, FX, payments, implementation and internal administration. Then subtract realistic rewards and labor savings. That produces a much more useful answer than a single “$0 fee” headline.