Stablecoin Pegs: The Anatomy of a Break

The stablecoin market experienced a series of incidents in July that highlighted the fragility of pegs and the importance of liquidity. On July 22, the algorithmic Balance Coin (BLC) cratered by approximately 99.75% after a reported BTCB oracle manipulation tied to the 42DAO exploit, resulting in around $912k-$915k being drained.

A week earlier, on July 15, the Arbitrum-based perps venue Ostium paused trading due to an oracle-related exploit that siphoned roughly $18 million in USDC from its OLP vault. Despite these incidents, the big fiat-backed names, such as USDT and USDC, barely flinched.

The contrast between the two types of stablecoins is striking. Fiat-backed issuers defend pegs with cash-like reserves and redemption windows, while algorithmic coins rely on incentives and arbitrage that can vanish under stress. The result was a string of small fires and one or two dramatic collapses.