Coinbase pulled $100M into a new dollar vault. Tether chose not to fight this battle.

$100M went into Coinbase's new high-yield USDC vault in four days. Crypto Briefing reported the milestone on June 15, after the June 11 to 12 launch. The vault is curated by Steakhouse Financial and built on Morpho. It accepts USDe and sUSDe as collateral.

That number needs primary confirmation before anyone treats it as settled fact. But the direction is already clear. Coinbase is handing users a higher-yield dollar vault inside a familiar interface. Tether chose not to fight that battle, and that's the catch.

The economics are straightforward. Stablecoin issuers make money when users hold dollars that earn yield somewhere else. Tether has built a giant business on that float. But once Coinbase can route retail users into yield-bearing dollar products, the old deal starts looking worse for users.

This is not the same risk as Coinbase's existing Prime USDC vault. The source article frames that product around blue-chip collateral. The Steakhouse vault uses USDe and sUSDe, which are more complex assets. USDe keeps its peg through long spot positions and short futures positions, not bank reserves.

If you're parking dollars here, your bag depends on more than Coinbase's brand. Morpho smart contracts have to work. Ethena's hedge has to hold. The exchanges behind the short futures positions have to pay and settle as expected.

The weak point is funding. Ethena can collect payments when funding rates are positive. During long bearish stretches, those payments can flip negative. Then the yield engine becomes a cost engine, and the free-money story gets harder to sell.

The historical parallel is money market funds in the 1970s. Banks did not lose deposits because people suddenly hated banks. They lost deposits because another product paid users for cash. Stablecoin issuers are facing a crypto-native version of that pressure.

Coinbase also has the distribution Tether lacks. It owns the retail interface, serves as Ethena's primary custodian and wallet provider, and can place this product beside simpler USDC options. That makes yield feel like a menu choice, not a separate DeFi hunt.

For now, this is a $100M signal from one reported source. Still, the backing layer just got real. If deposits keep rising, stablecoin competition stops being about who issues the dollar. It becomes about who gets to share the yield.