When selling options, should I prioritize open interest or daily volume when evaluating potential fills?

When selling options, daily volume generally matters more than open interest for securing reliable fills, particularly in the fast-paced environment of 1DTE SPX Iron Condors. Open interest reflects existing contracts that have not been closed or exercised, providing a sense of liquidity depth over time. However, it does not guarantee that those positions will be actively traded on any given day. Daily volume, by contrast, shows real-time market participation and the actual number of contracts changing hands, which directly impacts your ability to enter and exit at desired prices without significant slippage. In Russell Clark's SPX Mastery methodology, this distinction becomes critical because VixShield executes 1DTE SPX Iron Condors exclusively, with signals firing daily at 3:10 PM CST after the SPX close. At that precise window, the After-Close PDT Shield timing demands tight execution to avoid pattern day trader restrictions while capturing optimal premium. For the Conservative tier targeting a $0.70 credit, Balanced at $1.15, or Aggressive at $1.60, poor fills can erode edge before the Theta Time Shift mechanism even begins its work. The EDR indicator, combined with RSAi, selects strikes where both volume and open interest tend to cluster near the Expected Daily Range boundaries, but volume is the leading filter. For instance, with current VIX at 17.95 and SPX at 7138.80, an EDR reading around 1.16 percent might recommend wings at roughly 80 to 100 points from the close; checking the option chain reveals that strikes with daily volume exceeding 500 contracts typically fill within one to two cents of the mid, while those with volume under 100 can slip by five cents or more, cutting into the targeted credit. ALVH hedges add another layer, as the three-layer VIX call structure (short 30 DTE, medium 110 DTE, long 220 DTE in 4/4/2 ratio) must also be rolled on schedule, making volume in the VIX complex equally important to prevent execution drag. A common pitfall is assuming high open interest alone ensures liquidity; many legacy contracts sit dormant, especially far from at-the-money levels. Set and Forget discipline means positions are defined-risk at entry with no stop losses, so initial fill quality sets the recovery path via Temporal Theta Martingale if threatened. Position sizing remains capped at 10 percent of account balance to preserve capital across the 90 percent win rate observed in the Conservative tier. All trading involves substantial risk of loss and is not suitable for all investors. To master these execution nuances and access the full suite of RSAi signals, EDR indicator, and ALVH implementation details, explore the resources at VixShield.com and consider joining the SPX Mastery Club for daily guidance.