What the rule is
The no-scalp rule is a platform execution-layer rule that excludes ultra-short-horizon scalping trades — sub-minute or sub-bar entries that depend on order-book microstructure effects rather than on a documented, screened spot signal. The rule is a deliberate constraint on the strategy stack: even when very-high-frequency signals would post attractive backtest returns, they are not run.
What scalping looks like, in conventional usage
Scalping in the conventional trading sense means:
- Holding periods measured in seconds or a small number of minutes.
- Entries triggered by order-book microstructure (level-1 size imbalance, microprice moves, queue position).
- Tiny per-trade edges, monetised through high frequency.
- Sensitivity to fees, latency, and venue-specific rebate structures.
It is a specialist game that can be profitable with the right infrastructure and is more often where retail attempts to trade actively go wrong. The platform treats it as out of scope not because scalping is haram on its face — short-horizon spot trading is still spot trading — but because the failure modes of scalping are misaligned with the published methodology and the capital-preservation tilt of every tier.
Why the rule exists
Three reasons, each independent:
- Attribution. A spot trade that exits seconds after entry is hard to attribute to a screened-asset signal. The screening criteria sit at the asset and venue layer; if a strategy makes its money primarily from a venue-specific microstructure effect, the execution layer is doing something the published criteria do not describe. Holding the line on attribution is what keeps the methodology legible.
- Drawdown shape. Strategies that depend on microstructure edge tend to fail abruptly when the venue's microstructure changes (new fee schedule, new matching engine, new market-maker dynamics). The drawdown profile is short-tail until it is not. The platform trades upside for predictable drawdown shape, and scalping is the wrong instrument for that.
- Operational discipline. Scalping at scale needs co-located infrastructure, careful queue-position management, and continuous attention. Running a screened spot strategy that can be operated cleanly across many subscriber accounts is a different operations problem. The two postures do not coexist comfortably.
What the rule does not exclude
The rule is specifically about scalping, not about all short-horizon activity:
- Intraday rebalancing in response to a confirmed signal — fine. The signal is documented; the trade is not microstructure-driven.
- Stop-loss exits that fire faster than a typical hold — fine. The exit is a risk rule, not a scalp.
- Multi-bar momentum or mean-reversion entries — fine. Hold horizons of several minutes to several hours are within the published envelope.
- Same-day entries and exits when the underlying signal warrants it — fine. The point is the signal, not the duration.
The line is "is the trade attributable to a documented signal at the asset layer?". Scalping fails that test by depending on micro-price effects that are venue-specific and short-lived. Other short-horizon activity passes it.
Interaction with the universe screen
The no-scalp rule is independent from the universe screen. An asset can pass the published methodology and the no-scalp rule still applies to how it is traded. An asset can fail the methodology and the no-scalp rule does not save it. Both gates apply; neither is sufficient on its own. The cornerstone trading-strategy page at /halal-trading-strategy covers how the rule sits inside the wider strategy framing.
Why this is communicated as a "rule"
A capital-preservation strategy depends on pre-committed constraints holding up under live-market temptation. Saying "we don't scalp, by rule" is a stronger commitment than "we generally do not scalp" — the framing makes deviations visible and rare, not invisible and routine. The other published execution-layer rules (no leverage, no derivatives, spot-only on a regulated venue) are framed the same way for the same reason.
Quick reference
- Platform execution-layer rule excluding ultra-short-horizon scalping trades.
- Reasons: attribution, drawdown shape, operational discipline.
- Does not exclude all short-horizon activity — only microstructure-driven, signal-thin entries.
- Independent of the universe screen; both gates apply.
- Framed as a hard rule, alongside the no-leverage and no-derivatives constraints.