Payment infrastructure startup Fun has closed a $72 million Series A round led by Multicoin Capital and SignalFire, after quietly processing more than $18 billion in annual transaction volume. The company powers deposit and withdrawal flows for platforms including Polymarket, Lighter, and Aave.
Funding round draws firms and angel backers
According to reporting from Fortune, the round also included Infinity Ventures and Pharsalus Capital, along with angel investor Justin Mateen, the co-founder of Tinder. Fun is presenting itself as a neutral, API-first money layer for both Web2 and Web3 products, with its services embedded in consumer applications rather than offered as a direct retail product.
One API for bank rails, stablecoins, and onchain transfers
Fun’s core pitch is to hide the operational complexity behind moving money between traditional finance and crypto networks. It packages banking relationships, stablecoin liquidity, and compliance functions so app developers can support deposits, withdrawals, and settlement in local currencies and digital assets through a single API. On platforms such as Polymarket, that means users can move between dollars, stablecoins, and onchain markets while Fun handles the infrastructure in the background.
That backend role is easy to miss. It is also critical, because user experience in consumer apps often depends on low-friction funding and fast settlement. Fun appears to be focusing more tightly on consumer-facing products than some other infrastructure providers that move stablecoin volume for enterprises.
Positioning around access to DeFi and onchain finance
The model matters for crypto because stronger fiat-to-crypto rails can reduce the steps required for users to reach protocols like Aave. The article notes that this kind of infrastructure lets users access onchain products without having to interact directly with an exchange interface first. At the same time, stablecoin payments, onchain finance, and real-world asset activity are creating more demand for neutral systems that can move funds between bank accounts and smart contracts without exposing the underlying complexity.
With fresh capital from the Series A and a disclosed annual volume above $18 billion, Fun is entering the next stage with both investor backing and operating scale. The funding signals confidence that the companies controlling those payment rails may hold a strong position in how money moves across banks, stablecoins, and onchain applications.