Underserved SMBs Support Scaled Fintechs
Flex
This is a market structure point, not just a company point, because Flex, Slash, and Kapital show that horizontal finance products leave entire bands of SMB demand open when they optimize for safer, more standard customers. Flex wins owner operators who need Net-60 working capital built into the card. Slash wins high chargeback merchants that mainstream fintechs avoid. Kapital wins SMEs that need cash flow control, financing, and software in one place, and each has reached meaningful scale.
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Flex is not peeling off a few edge cases. It built to roughly $75M in annualized revenue in 2025 by serving construction, logistics, and trucking businesses with high card spend and slow receivables, customers that startup focused neobanks largely skipped.
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Slash reached $200M annualized revenue in December 2025 by banking agencies, ecommerce sellers, and crypto native SMBs that get rejected or constrained elsewhere. The key difference is not branding, it is underwriting for riskier industries with heavy card spend, which makes the niche economically real.
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Kapital reached $184M annualized revenue in 2024, with 500,000 merchants, by bundling account balances, payables, receivables, cards, and financing for Latin American SMEs. The pattern is the same as Flex, solve the cash flow pain that horizontal incumbents treat as too small, too messy, or too risky.
The next phase is more vertical unbundling inside SMB finance. As incumbents add dashboards and AP features, independents will keep winning where they move faster on underwriting, payment terms, and workflows shaped around a specific operator's day to day cash cycle. That leaves room for several scaled companies, each anchored in a different underserved segment.