What it actually does
It lets the market draw the line, then trades the break of it.
Aperture measures the first fifteen minutes of the US session — the range the market makes while it decides what the day is about — and then trades the break of that range. It does not predict the direction. It waits for the market to pick one and goes with it.
The appeal of an opening range is that it is drawn by the market, not by us. There is no fitted level, no indicator threshold to curve-fit. The high and the low of those fifteen minutes are facts, and everything the engine does hangs off them.
Be punctual with it: if it is not running before 09:30 ET it has no range to measure and it will sit out the day. It also needs Tick Replay switched on in the data series before you add it — the reference guide walks through both.
The honest two-sided ledger
Where it wins. Where it hurts.
Thrives in
- Days that leave the open behind. A session that breaks out of its first fifteen minutes and keeps going is the entire thesis.
- Gap and continuation mornings. An open that immediately establishes direction gives the cleanest ranges to work from.
- Volatility at the bell. The engine needs the opening range to mean something — a lively open produces a range worth breaking.
Faces duress in
- Days that reverse back inside the range. The break happens, then price returns through the range and out the other side. This is the classic opening-range failure and its #1 weakness.
- Narrow, listless opens. A tiny opening range produces a break that has nowhere to go.
- Choppy midmornings. Repeated pokes either side of the range are the worst shape for it.
The weakness is the point. Aperture is an early-session engine — it has usually finished its work while other engines in the book are only starting theirs, which spreads the portfolio across the day as well as across markets.
The regime truth
Low strike rate, big winners. Know that before you watch it.
This is not an engine that wins most of its trades, and we would rather you knew that from us than discovered it in week two. A meaningful share of days break out and fail, and those cost a little each. The account is carried by the smaller number of days that break out and keep going.
Judged over a week that can look poor. Judged over a run of sessions it is the shape the engine has always had. The published trade file shows every one of those failed breaks, not just the days that worked.
The flip side of that honesty: a stretch of quiet, rangebound opens is a losing stretch for this engine, and it is not rare. Size it for that, not for its best month.
Risk & bail-out
Drawdown-first, with hard lines that don't move.
A resting protective stop is placed the moment a position opens, sized from the risk settings you choose rather than a fixed tick count — so the same configuration behaves sensibly whether the open is calm or violent.
A daily loss line flattens the strategy and stands it down for the rest of the session. Everything is closed out by the session close; Aperture holds nothing overnight.
The two settings you control are the cash at risk and the maximum contracts. Everything else that determines behaviour is locked to the configuration the published results came from, so what you run is what was tested.
How we catch decay before it’s too late
We monitor this like a model, not a hunch.
Every edge decays eventually — ours included. The difference is whether you find out from a dashboard or from your account balance. Aperture runs inside a monitoring loop that compares every live trade against its learned baseline and raises a flag the moment behavior drifts.
The promise. We would rather pull Aperture back a month early than a day too late. When the data says the edge is thinning, we trim or bench it — publicly — instead of hoping it comes back.