Fun raises $72m to power unified fiat and crypto rails for apps like Polymarket and Aave, after quietly processing over $18b in annual payment volume. Summary Payment infrastructure startup Fun has raised $72 million in Series A funding led by Multicoin Capital and SignalFire to power fiat and crypto rails for consumer apps. The company provides deposit and withdrawal infrastructure for platforms like Polymarket, Lighter, and Aave, and says it processed more than $18 billion in transaction volume over the past year. New investors include Infinity Ventures, Pharsalus Capital, and Tinder co-founder Justin Mateen, as Fun positions itself as a neutral, API-first “money layer” for Web2 and Web3 products. Fun, a payment infrastructure startup that plugs both fiat and crypto rails into high-growth consumer platforms, has closed a $72 million Series A round led by Multicoin Capital and SignalFire, according to reporting from Fortune. Fun’s $72m bet on unified payment rails The company, which quietly powers deposits and withdrawals for prediction markets like Polymarket, social apps such as Lighter, and DeFi lenders including Aave, told Fortune it now handles more than $18 billion in annual transaction volume across its network. Infinity Ventures and Pharsalus Capital joined the round alongside angel backers like Tinder co-founder Justin Mateen, extending a broader trend of consumer-tech investors backing crypto-native payment rails. Wiring Web2 apps into crypto liquidity Fun’s pitch is simple: abstract away the complexity of banking partners, stablecoin liquidity, and compliance so that apps can offer seamless deposits and withdrawals in local currencies and digital assets through a single API. As Fortune notes, Fun sits in the background while users on platforms such as Polymarket move funds between dollars, stablecoins, and onchain markets, providing the “plumbing” that talks to both banks and blockchains. That model echoes other infrastructure players moving billions in stablecoin volume for enterprises, but Fun is more tightly focused on consumer-facing apps where users expect instant settlement and low friction. For crypto markets, this kind of infrastructure matters because it lowers the barrier for mainstream users to reach DeFi protocols like Aave without ever touching an exchange interface. When combined with rising interest in stablecoin payments—Cointelegraph recently highlighted estimates that roughly $60 billion was spent on legacy remittance fees in 2025 alone—Fun’s bet is that a growing share of that flow will migrate into programmable dollars that its rails can move around the world. A deeper, more reliable fiat–crypto bridge also feeds into narratives around Bitcoin and Ethereum as macro assets.As previous crypto.news coverage on Bitcoin’s march toward $110k and Fed-driven BTC rallies has shown, easier access to onchain markets tends to amplify how quickly capital responds when macro conditions shift. In parallel, real-world asset and onchain finance projects—such as those tracking institutional flows into DeFi versus fintech rails in this Aave-focused analysis—are increasingly dependent on neutral payment layers that can move funds between traditional accounts and smart contracts without users ever seeing the pipes. Fun’s $72 million war chest, combined with its $18 billion in annual volume, suggests investors are betting that whoever owns those pipes will have outsized leverage over how money moves between banks, stablecoins, and onchain applications over the next cycle. If you mention major assets in your piece, remember to link their price pages from crypto.news’ market-cap section, for example Bitcoin and Ethereum.
