Circle just got a taste of how fast its lead can be challenged. Shares of Circle Internet Group — issuer of the USDC stablecoin — fell about 8% after a heavyweight consortium unveiled a competing stablecoin designed to attack the very thing that makes Circle profitable, CoinDesk reported.

What was announced

A group called Open Standard — backed by more than 140 companies, including Visa, Stripe, Coinbase, BlackRock, Mastercard, Google (Alphabet), BNY Mellon and Klarna — is launching a stablecoin called "Open USD," Bloomberg reported. It's run by a venture led by Zach Abrams, a co-founder of Bridge, the stablecoin-infrastructure firm Stripe acquired. The coin is slated to go live later this year.

(Quick refresher: a stablecoin is a crypto token pegged one-to-one to a currency like the dollar, used for payments and settlement without the wild swings of bitcoin. The issuer holds reserves — typically cash and US Treasury bills — backing every token.)

Why it threatens Circle

Here's the crux. Circle makes its money by investing the reserves that back USDC — about $73 billion worth — in Treasuries and keeping the interest. Open USD flips that model: it would let partners mint and redeem tokens cheaply while sharing out the reserve income among the consortium, rather than one issuer pocketing it. In other words, it attacks exactly where Circle earns its profit.

The sharpest signal is Coinbase's involvement. Coinbase has a lucrative revenue-sharing deal with Circle on USDC — yet it's also backing the rival. The read: Coinbase may see more upside in owning a piece of the new network than in depending on Circle's arrangement. That's why the stock fell.

The bigger picture

Stablecoins have become one of the hottest battlegrounds in finance because the underlying business — earning yield on reserves — is genuinely lucrative, especially with interest rates elevated. US legislation (the GENIUS Act) and the EU's MiCA rules have given the sector a clearer legal footing, and now the giants are piling in: payments networks (Visa, Stripe, Mastercard), an asset manager (BlackRock), Big Tech (Google) and exchanges (Coinbase) — not as customers, but as owners of the rails.

This isn't Circle's first scare. Boursel has tracked the sector's swings, including an earlier slump in Circle's stock on regulatory worries about whether issuers could keep paying yield. The difference now is that the threat is concrete and well-funded, not theoretical.

Why it matters

For Circle, the question is whether its first-mover lead with USDC — a real, $73-billion head start — can withstand a consortium of the world's biggest payment and finance names building an alternative. For the stablecoin market, the move points toward a future where the economics are shared across many players rather than captured by a single issuer — which may appeal to the institutions deciding which coin to use. And for the broader story Boursel follows, it's another sign that stablecoins are going mainstream — pulling in the largest names in money, and turning a once-niche crypto product into contested financial infrastructure. Boursel offers no view on Circle's shares; the takeaway is that owning the dollar's digital plumbing is now a fight among giants.