Write about a recent arbitrage opportunity. Boros recently launched the BN and HL markets for BNB. These two markets present an arbitrage opportunity arising from structural interest rate differentials. By maintaining delta neutrality and using a relatively safe 5x leverage, the APR is around 9%. With more aggressive leverage or when using other full-position accounts as a safety cushion, the APR can be further increased to nearly 20% or even 30%. To make it easier for beginners to understand, I will divide the content into two parts: the Opportunity and the Arbitrage Strategy. Experienced users can skip the Opportunity section.