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Uncomfortable truth: a lot of 0DTE traders are earning between a third and a quarter of what their backtests promised.
So are we. And I'd rather say that out loud than pretend otherwise.
Two things happened.
The market matured. 0DTE volume has grown ~20–25% a year. More participants, less easy premium. Blind selling used to capture 7–10%. Now it's closer to 4–5%. That's not a bug — that's what a maturing market looks like.
The backtests were flattering. Tick-level data and minute-to-second fills are now available. Capping stop losses on a backtest overstates results — by up to ~40%. If your stop is $6 and the spread jumps to $8 in the next second, you eat slippage from $8, not $6. That gap is enormous when your edge is 10–15 cents.
So the honest expectation now: ~4–5% expected value, roughly 10 bps a day selling ~2% of the account — barring odd execution.
Anyone still quoting you a 40% CAGR off a clean backtest either hasn't updated their tools or is selling you something.
#quantfinance #optionstrading #investing
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