Circle flipped the switch. Arc, the company's Layer-1 blockchain built for stablecoins, enters public mainnet on September 16 with an unusual roster of founding validators: BlackRock, Visa, Mastercard, DTCC, ICE, Fireblocks, Standard Chartered, Galaxy, and MoneyGram.
This isn't a startup's testnet pump. The DTCC clears the bulk of US securities trades. ICE runs the New York Stock Exchange. When institutions this size run validator nodes instead of just dabbling in pilot programs, the commitment shifts from experimentation to operational infrastructure.
From concept to mainnet in eleven months
Circle announced Arc in August 2025, shipped the public testnet five months later, and is now hitting mainnet roughly a year after the initial reveal. During testnet, the network processed 244 million transactions with more than 100 builders already developing on it. That velocity matters because it suggests the chain isn't launching into a vacuum.
The network was purpose-built around stablecoin applications. Circle baked in privacy tools and what it calls an "Agent Stack" for programmable finance, essentially infrastructure that lets autonomous software agents execute financial logic onchain. Fireblocks' involvement as a validator makes structural sense, the company already processes billions in digital asset transactions for institutional clients and serves as the settlement layer for many of them.
Circle raised $222 million in a token presale back in May 2026, valuing the Arc network at $3 billion. The native token, ARC, functions as the network's coordination asset. The September 16 launch was confirmed in Circle's Q2 2026 earnings report, dated August 5, 2026.
This article provides information about network launches and institutional participation in blockchain infrastructure. It is not financial advice and should not be treated as a recommendation to buy, sell, or hold any cryptocurrency or token.
