CBB says Hyperliquid-IBKR stock perp arbitrage generated $32 billion in volume and about $10 million in profit
X user CBB published a detailed account of how he and his brother spent the past 10 months arbitraging price gaps between Hyperliquid’s HIP-3 stock perpetual contracts and Interactive Brokers, or IBKR. According to the post, the pair started with no background in stock trading, stitched together a hedging system by working through IBKR’s API, and even used Anthropic’s Claude to understand parts of the broker interface and hedging flow. The strategy treated IBKR quotes as the reference price and traded against discounts or premiums in HIP-3, with positions hedged on the broker side. CBB said the effort eventually produced $32 billion in trading volume, equal to 1.5% of TradeXYZ’s total volume, and roughly $10 million in net profit, with annualized returns on deployed capital of 35% to 45%. The write-up also described a major failure: a stale IBKR market data feed led the bot to build a $120 million net short position in gold futures, resulting in a $1.1 million loss after manual unwinding. The pair later tightened controls, added checks on quote freshness, upgraded risk management, and expanded into metals, oil and semiconductor-related names. CBB said the opportunity may narrow as firms including Ethena move into stock basis trading and more regulated institutions connect to the market.








