Indian traders are preparing for the first monthly derivatives expiry using auction-based end-of-day stock prices. This mechanism, launched on August 3, has faced criticism over sharp price swings and manipulation allegations. Tuesday's expiry will test the system with a broader range of derivatives positions, including physically settled single-stock options, all tied to auction-generated closing prices. The transition marks a significant shift from the previous regular sessions and weekly expiry structure.

Market analysts view this test as critical for validating the auction model's stability. The system's implementation has sparked debate among market participants regarding price discovery and fair value assessment. Regulators hope the monthly cycle will provide more robust data on the mechanism's effectiveness under increased trading pressure.

The auction-based approach aims to reduce intraday volatility by consolidating trading activity into a defined end-of-period pricing mechanism. However, early adoption has revealed challenges in price consistency and participant adaptation. This first monthly expiry serves as a pivotal moment for assessing whether the new methodology can deliver more reliable market benchmarks.