See how much of today was 0DTE

What this recipe computes

• Same-day-expiry share of contracts and of premium for SPX, SPXW, SPY and QQQ.
• The 0DTE contract and premium totals behind those shares.
• The same split per root.

What it does not claim

• The contract share is not "0DTE is most of the market" — same-day options are cheap and trade in size.
• Scoped to the index complex, where daily expiry exists; it is not a whole-market figure.
• It measures activity, not positioning or dealer exposure.

How to read it

1. Step 1

   Compare the two shares

   Contracts runs far above premium. The gap is the whole point.

2. Step 2

   Check the roots

   SPXW carries SPX’s same-day expiries and is shown separately rather than folded in.

3. Step 3

   Look at the trend

   The 0DTE Share Tracker follows the same measure across a session window.

Frequently asked questions

Is 0DTE really most of options volume?

By contract count in the index complex it is a large share. By premium it is far smaller, because each same-day contract carries little value. Quoting only the contract share overstates it.

Why only SPX, SPXW, SPY and QQQ?

Those are the roots with daily expiries. Averaging across thousands of single names that list no same-day expiry would dilute the number into meaninglessness.

Related glossary

• 0DTE (zero days to expiration)0DTE options expire the same trading day. Gamma and theta move fastest near the money on that clock.
• Option flowOption flow is the time-and-sales stream of options prints: contract, size, premium, and inferred aggressor side.
• Open interest (OI)Open interest is how many options contracts remain open. Unlike volume, it does not reset each morning and usually updates after the session.

Related personas

• GEX and Option Flow for Index TradersIndex traders care about session character: where call/put walls sit, whether gamma is dampening or amplifying, and whether premium is chasing or fading the move.
• Real-Time Option Flow for ScalpersScalping with options flow is attention management. KPI cards and tight filters shrink the tape to tradable bursts; structure is a quick invalidation check, not a multi-hour thesis.
• Options Flow for Day TradersDay traders need speed with a filter: see what is printing now, rank what is unusual, then validate structure before risking capital. TradingFlow is built for that same-session loop.

Related recipes

• 0DTE shareSee whether same-day expiry is dominating the index tape without mixing it into yesterday’s GEX walls.
• Most activeAnswer "what were the most active options today" in one look.
• Put/call ratioAnswer "what is the put/call ratio today" without taking a contract-count number at face value.