Brex's free card growth engine

Brex used pricing to turn the corporate card from a finance purchase into a growth engine. Amex made money upfront with annual fees and premium positioning, while Brex removed the fee, approved startups based on cash balances instead of operating history, and got paid every time a customer ran payroll adjacencies, software, travel, and ads through the card. That made customer economics rise with a startup’s spend, not with a fixed subscription.

• The free card mattered because startups had been poorly served by incumbents. Brex approved companies in seconds by linking bank accounts, skipped personal guarantees, and offered much higher limits than Amex. That made the product feel less like a rewards card and more like core financial infrastructure for a new company.
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• Interchange turned Brex into a volume business. At roughly 2.7% on purchase volume, each extra employee card, vendor payment, or travel booking increased revenue automatically. That is why Brex could afford aggressive acquisition and why its best customers became more valuable without any repricing conversation.
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• The next wave of competition changed the game again. Ramp, Divvy, Airbase, and others copied the free card model, then bundled approvals, receipt capture, bill pay, and accounting automation around the card. The card stopped being the product and became the rail that fed a broader spend management software suite.
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The market is moving toward a mixed model where interchange still lands the customer, but software, payments, FX, and embedded distribution drive the next layer of growth. Brex is already pushing in that direction, using card volume to enter accounts first, then expanding into spend management, global cards, and embedded payments inside platforms like Navan and Coupa.