Arbitrum ($ARB ) surged nearly 30% while Bitcoin remained around $78,000, driven by a fundamental catalyst rather than market-wide momentum. The key reason is Robinhood Chain, which operates on Arbitrum technology and shares 10% of its net protocol revenue with the Arbitrum ecosystem. Over the past eight days, Robinhood Chain’s daily revenue reportedly jumped from about $55,000 to over $1 million, significantly increasing Arbitrum’s revenue share and implying an annualized run rate near $73 million. Investors quickly repriced ARB as rising open interest signaled fresh demand. However, much of the revenue comes from memecoin activity, which may prove volatile.