0DTE (Zero Days to Expiration)

0DTE stands for zero days to expiration, an options contract that expires on the same trading day it's being traded. These contracts exist because many major indices and a growing list of individual names now list options that expire every single trading day rather than only on the traditional weekly or monthly cycle, so on any given session there's always a same-day expiry contract available to trade.

0DTE contracts are the fastest-decaying, most leverage-sensitive corner of the options market. Time value evaporates within hours rather than days or weeks, so small moves in the underlying stock can produce outsized percentage swings in the option's price in either direction. That makes 0DTE volume a rough proxy for same-day speculative and hedging activity. Traders using them tend to be expressing a view on where price lands by the closing bell, not building a multi-week position.

0DTE activity doesn't say anything about a stock's medium or long-term direction. By definition, every position in a 0DTE contract is closed or expired by the end of the same session, so it says nothing about positioning beyond that day. It's also a poor proxy for conviction. The same contract that decays to zero if the bet is wrong can produce a large percentage gain on a very small move if it's right, so raw dollar volume in 0DTE contracts can look dramatic without representing much actual risk taken by any one trader. Heavy 0DTE volume in an index doesn't necessarily translate to anything meaningful for an individual stock, either. And because these contracts settle in hours, not days, there's no way to hold through a rough patch and wait for the thesis to play out. Either the move happens in the session or the premium is gone.

Suppose SPY 0DTE call volume at a strike five points above the current price runs three times its recent average by midday. That elevated volume says day traders and short-term funds are actively positioning for or against SPY reaching that level before the close, useful context for gauging same-day sentiment. It says nothing about what SPY does the following week, since every one of those contracts will have expired, worthless or not, before the next session even opens. A heavy 0DTE session followed by a quiet one doesn't imply anything carried over.