Arc Awaits: BlackRock, Mastercard and Visa Join Circle's Validator Glow-Up 🚀

Circle Internet Group has confirmed September 16 as the mainnet launch date for its Arc Layer-1 blockchain and unveiled a founding validator cohort drawn almost entirely from traditional finance. Named alongside Circle are BlackRock, The Depository Trust & Clearing Corporation (DTCC), Galaxy, Global Payments, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation and Visa. The company said Arc is designed to meet the trust, security, operational and compliance standards required of critical financial market infrastructure, with gas paid in Circle's USDC stablecoin.

BlackRock is expected to deploy its BUIDL fund (BlackRock USD Institutional Digital Liquidity) on Arc, while DTCC will enable tokenization of assets it custodies, though not until the second half of 2027. Arc is currently in private mainnet with more than 100 builders, and CEO Jeremy Allaire told analysts its testnet has processed more than half a billion transactions across nearly 3 million wallets. Aave, Morpho and Uniswap are named as day-one DeFi protocols, with Binance Wallet, Kraken, Ledger and MetaMask providing access. On the earnings call, Allaire called the line-up "a cohort of network validators no other network can match."

The validator announcement accompanied Circle's second-quarter results released Wednesday. Total revenue and reserve income came to $701 million, up 7% year-over-year and slightly ahead of the previous quarter, though still below the $770 million Circle booked in the final quarter of 2025. Reserve income of $668 million grew 5%, with the reserve return rate down 66 basis points to 3.5%. Net income of $48 million compared with a $482 million loss a year earlier, when IPO stock compensation dominated the quarter, and adjusted EBITDA reached $143 million, up 8%.

USDC in circulation closed the quarter at $73.3 billion, up 19%, while on-chain transaction volume hit $14.8 trillion, up 151%. Circle's share of the fiat-backed stablecoin market slipped to 27%. Speaking on the earnings call, Allaire said "digital asset markets themselves have continued to see significant weakness." He also disclosed that Circle's distribution agreement with Coinbase has "renewed on its existing terms," leaving unchanged the arrangement behind the $410 million in distribution and transaction costs Circle booked in the quarter. CRCL shares moved higher in after-hours trading despite the mixed results, and the company separately confirmed receipt of final OCC approval to establish a national trust bank.