Just been looking into how fintech companies have completely reshaped the backbone of modern finance, and it's honestly more dramatic than most people realize. According to recent research from Andreessen Horowitz, these firms now provide the core infrastructure for about 70% of new financial products being launched globally. That's a massive shift from where we were even a decade ago.

Think about what financial infrastructure used to mean. You had Visa, Mastercard, SWIFT, FIS, Fiserv—basically a handful of giants controlling everything. They still matter, but the real game has changed. Now you've got fintech companies building this entire new layer on top, making finance programmable and accessible through APIs.

The scale is wild. Plaid alone connects over 12,000 financial institutions to fintech apps. Marqeta powers card issuing for Square, DoorDash, Affirm. Galileo handles 150 million accounts. And this infrastructure layer? It's a $150 billion opportunity. What really caught my attention is the spending growth—fintech infrastructure investments jumped 28% annually between 2020 and 2025, while legacy banking systems only saw 6% growth. That tells you everything about where the money's flowing.

Banking-as-a-Service is probably the most interesting innovation here. These BaaS platforms let companies like Apple and Uber offer actual banking services—deposit accounts, debit cards, lending—without needing their own banking license. The BaaS provider handles compliance, they own the customer. The market went from basically nothing to $40 billion in 2025, and it's projected to hit $74 billion by 2030. For fintech companies specifically, this means a two-person startup can now do what would've required 200 people and regulatory approval a decade ago.

Real-time payments are another huge piece. India's UPI, Brazil's Pix, the UK's Faster Payments, the Fed's FedNow—they're all processing transactions instantly now. Global real-time payment volume hit 266 billion transactions in 2025, up from 118 billion just three years earlier. And fintech companies aren't just using these systems; they're building on them. Wise created its own multi-currency settlement network to bypass traditional correspondent banking. Ripple's using blockchain for cross-border settlement.

But here's where it gets concerning. The concentration risk is real. When Synapse, a major BaaS provider, hit financial trouble in 2024, it cascaded through dozens of fintech companies and their customers. Regulators noticed. The OCC, FDIC, and Federal Reserve all issued joint guidance in 2025 about bank-fintech partnerships and third-party risk management. According to BCG's risk assessment, the top concerns are operational resilience, data security, and customer protection in these multi-party service chains.

The fintech industry is still growing strong—expected 23% CAGR—but that depends on keeping this infrastructure layer stable and trustworthy. The 70% figure might actually understate the trend. As more financial products get built on API-driven infrastructure, we could be looking at 90% of new financial services relying on fintech companies' infrastructure within five years. That's the real story here.