Card Spend Fuels Neobank Revenue

This spend mix explains why Slash can out monetize larger banks on less total dollars moved. Payroll is usually pushed as ACH, which is cheap and produces little interchange, while Slash sits in categories like media buying where customers swipe or use virtual cards all day. That means each dollar of spend is worth more revenue, because card rails pay the issuer and ACH mostly does not.

• Brex and Ramp started with cards, but both expanded into banking, bill pay, and software because startup finance spend is not mostly card swipe spend forever. Once payroll and vendor payments become a bigger share, volume grows faster than interchange revenue.
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• Slash picked SMBs where the biggest expense already lives on cards. Performance marketing agencies buy ads on Meta, Google, and TikTok with cards and need controls like separate accounts and spend limits by client, so the product fits the workflow and captures richer payment economics.
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• This is the same broader fintech shift from generic neobanks toward vertical products with a real right to win. The surviving winners are not just offering an account, they are wrapping payments around a painful workflow and using that workflow to earn both lower CAC and higher monetization per customer.
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Going forward, more B2B neobanks will segment by payment mix, not just customer size or industry. The highest value niches will be the ones where spend is frequent, card based, and tied to a daily operational workflow, because that combination turns banking from a low yield utility into a high yield software plus payments business.