The Company Quietly Powering Polymarket and Aave Just Raised $72 Million

News. Fun, the payments infrastructure company behind some of the largest internet native capital markets, has closed a $72 million Series A. The round was co led by Multicoin Capital and SignalFire and announced on May 1, 2026. Fun has operated in stealth since its founding in 2022. This is its first public funding announcement, and it comes with a number that reveals how much ground the company has already covered: $18 billion in transaction volume per year, a 99.999% success rate, and active payment infrastructure for Polymarket, Lighter, and Aave across more than 100 countries.

Key Highlights

• Fun raises $72 million Series A co led by Multicoin Capital and SignalFire
• Company founded in 2022 and operated in full stealth until this announcement
• Powers deposits, withdrawals, and settlement flows for Polymarket, Lighter, and Aave
• Processes over $18 billion in transaction volume per year with a 99.999% success rate
• Supports millions of users across more than 100 countries
• Funding will support engineering hires, a new Singapore office for APAC expansion, and selective acquisitions
• CEO Alex Fine describes the core mission as removing the technological barrier of value exchange

Four Years in Stealth, $18 Billion in Volume

Fun’s emergence from stealth is unusual for a payments company at this scale. Most infrastructure companies in the fintech space pursue brand visibility early, partnering with visible names to signal traction. Fun did the opposite. It built quietly, won partnerships with some of the most demanding platforms in digital finance, and let the volume speak for itself.

Eighteen billion dollars in annualized transaction volume is not a beta product. It is a functioning payments layer operating at institutional scale. The 99.999% success rate is equally significant. In payments, a single percentage point of failure at that volume means hundreds of millions of dollars in failed transactions per year. Fun’s reliability record positions it in a different category than most competitors, which Polymarket’s VP of Engineering Josh Stevens confirmed directly.

“We’ve evaluated every major payments company, and Fun is in a different category,” Stevens said. “They operate like an extension of our team, building around real user behavior and catching edge cases others miss. Fun has built the highest converting, most reliable deposit flow we’ve ever had.”

For a prediction market like Polymarket, where users are depositing and withdrawing against live event outcomes, payment friction is not just a user experience problem. It is a revenue problem. Every failed deposit is a bet that never happens. Every slow withdrawal is a reason to use a competing platform. Fun’s value proposition is that it has solved those problems at a conversion rate and reliability level that larger payments companies have not matched.

The Platforms Fun Already Powers

The client list is what makes Fun’s emergence significant for the broader Web3 and fintech ecosystem. Polymarket is the world’s largest prediction market by volume. Aave, which just launched V4 on Ethereum with ambitions to expand into real world credit markets, runs one of the largest DeFi lending protocols in the world. Lighter operates a high performance on chain order book exchange.

What these three platforms share is that payment performance is existential. Aave cannot run a lending protocol if users cannot move collateral in and out reliably. Polymarket cannot run a prediction market if deposits fail or slow during high volume events. Lighter cannot operate a competitive exchange if withdrawals lag. Fun’s clients are not low stakes. They are some of the highest stakes environments in digital finance, where reliability failures become public conversations immediately.

The stablecoin market crossing $320 billion has created massive demand for exactly the kind of infrastructure Fun provides. As more capital moves through stablecoin rails, the pipes that carry that capital matter as much as the stablecoins themselves. Fun appears to have built some of those pipes.

Multicoin and SignalFire: What the Backers Signal

The choice of co leads is notable. Multicoin Capital has been one of the most analytically rigorous crypto venture funds, known for thesis driven bets on infrastructure and protocol layers. Its participation in Fun’s round signals conviction that payments infrastructure at the application layer is an underinvested category with durable returns.

SignalFire brings a different profile: a data driven venture fund that uses proprietary signals to identify early breakout companies. Its involvement alongside Multicoin suggests the round attracted both crypto native conviction and broader fintech institutional appetite.

The combination matters for how Fun will grow. Multicoin’s network covers the crypto native platforms Fun already serves. SignalFire’s network extends into traditional fintech, where Fun’s technology could displace existing payment processors that were built for a slower, more fragmented world.

Crypto VCs have increasingly pivoted toward stablecoin and payments infrastructure as the investable thesis of the current cycle. Fun fits that thesis precisely. It is not a consumer app or a token project. It is rails.

The Singapore Play and What Comes Next

Fun’s stated use of proceeds breaks down into three areas: engineering investment, APAC expansion via a new Singapore office, and selective acquisitions to deepen its infrastructure stack.

The Singapore office is the most geographically interesting signal. Southeast Asia has some of the fastest growing digital asset markets in the world, and Singapore has positioned itself as the regulatory anchor for compliant crypto and fintech operations in the region. A South Korean fintech company like Toss building its own blockchain illustrates just how aggressively APAC is moving into crypto native financial infrastructure. Fun entering Singapore puts it at the center of that growth.

The acquisitions language is also worth noting. “Selective acquisitions to deepen the infrastructure stack” is not a vague growth statement. It suggests Fun has identified specific capabilities it wants to bring in house rather than build from scratch, likely in areas like compliance, FX conversion, or regional banking relationships. At $72 million raised, it has the capital to move quickly.

As AI agent wallets move toward autonomous on chain finance, the payments layer becomes even more critical. Agents that need to move money across borders in real time require infrastructure that works at machine speed and global scale. Fun’s architecture, built for exactly those conditions, positions it well for a future where payments are not just human initiated but programmatically executed at scale.

Fragmentation Is the Enemy of Conversion

CEO Alex Fine’s framing of the core problem is precise: financial infrastructure was built for a slower, more fragmented world. Different rails, different currencies, different systems that do not interoperate. That fragmentation shows up as friction, and friction destroys conversion rates.

The insight is not new. What is new is that the platforms demanding zero friction payments now include DeFi protocols, prediction markets, and on chain exchanges alongside traditional fintech applications. The standards these platforms set for payment performance are higher than what most incumbent processors were built to meet.

The GENIUS Act’s advancing framework for stablecoins adds a regulatory tailwind. As stablecoin payments gain legislative clarity in the United States, institutional platforms will accelerate adoption, and the payment infrastructure layer underneath those platforms will matter more, not less.

X Money’s crypto native hire to lead payments design signals the same directional shift at consumer scale. The next generation of financial applications is being built with fundamentally different expectations about what payments infrastructure should do. Fun is building for that generation.

The TCB View

Fun’s stealth emergence is the most credible kind of launch story in infrastructure: four years of building, $18 billion in volume, and clients that chose it over every major payments company after running the comparison. That is not a pitch deck. It is a track record.

The $72 million round is meaningful but the more important number is the annual transaction volume. Eighteen billion dollars is a number that says Fun is not a startup experimenting with payments at the margins. It is already operating at a scale that competitors will struggle to dismiss.

What the company needs to prove next is that the same engineering excellence that won Polymarket and Aave can scale into new geographies and new client categories without the bespoke attention that made those early partnerships work. Singapore will be the first test of that. If Fun can replicate its conversion and reliability performance in APAC’s more complex regulatory and banking environment, the $72 million will look like a modest down payment on something considerably larger.