The 5 Best SPX 0DTE Indicators for Intraday Trading

Trading 0DTE (Zero Days to Expiration) options on the S&P 500 requires specialized data. Because 0DTE options now represent over 60% of daily SPX volume, traditional technical indicators like RSI or MACD often fail to capture the market maker hedging that actually moves price. To gain an edge, you must track the options flow directly.

Here are the best SPX 0DTE indicators used by professional intraday traders.

1. HIRO (Highly Intelligent Real-Time Options) Indicator

The HIRO indicator is the gold standard for tracking 0DTE options flow. It measures the directional pressure exerted by options dealers in real-time. When 0DTE traders buy calls or sell puts, dealers must hedge by buying futures. HIRO visualizes this cumulative hedging, showing you whether market makers are being forced to push the market higher or pull it lower.

2. TRACE Gamma Heatmaps

Unlike a static chart, the TRACE heatmap shows how 0DTE gamma exposure changes across different price levels throughout the day. It is the only gamma GEX SPX heatmap that updates market maker positions every single minute of the trading day. For 0DTE traders, this reveals “Gamma Vacuums”—zones of negative GEX where price can slide or squeeze rapidly—and “Gamma Pins,” where the market is likely to stall and chop. Knowing where these zones are allows you to set more accurate profit targets and stop-losses.

3. The Stability Gauge

The Stability Gauge is a forward-looking metric that measures the likelihood of a large price move over the next 10 minutes. For a 0DTE trader, this is an essential risk management tool. A low stability reading suggests that a “gamma flip” or volatility expansion is imminent, signaling that it may be time to tighten stops or exit range-bound trades.

4. 0DTE Strike Plot (Volume vs. Open Interest)

The Strike Plot allows you to isolate exactly which SPX strikes are seeing the most 0DTE activity. By filtering for 0DTE-only GEX, you can identify where the “Big Money” is positioned for the afternoon pin. High concentrations of 0DTE open interest at a specific strike (like a round number or key level) often act as a magnet for price as the 4:00 PM EST close approaches.

5. Net Open Interest (Net OI)

Net OI reveals the asymmetry in dealer positioning. It shows whether market makers are net long or net short at specific strikes. In a 0DTE environment, a strike with massive “Trader Short Puts” (Dealer Long Puts) creates a powerful floor, as dealers will buy every dip to hedge their position. Conversely, “Trader Long Calls” can create a ceiling that market makers will sell into.

Conclusion: Why 0DTE Indicators Matter

Standard technical analysis tells you what price did. 0DTE options indicators tell you what market makers must do to remain delta-neutral. By using tools like HIRO and TRACE, you are no longer trading against the trend—you are trading with the flow of billions of dollars in institutional hedging.

Ready to track 0DTE flow in real-time? Explore SpotGamma Alpha and access the TRACE dashboard today.