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Five pillars, four filters

A name makes the board when it clears four filters: gap, price, float and premarket volume. News is flagged on every row but not required, and relative volume ranks the board; it is not a filter on this scan (the Day Trading watch list applies a 0.25x soft floor). These are the default thresholds — the ones the free preview runs on.

Gapping up

The stock is up hard versus the session's reference close — premarket vs yesterday's close, after-hours vs today's close. That extended-hours move is the fuel a momentum play needs.

Filterpass if gap≥ 10%

Low float

Few shares available to trade, so incoming demand moves the price faster. Low float is what turns a catalyst into a violent move.

Filterpass if float≤ 100M shares

Real premarket volume

At least 50k shares traded before the bell. Relative volume versus the stock's own average day ranks the board; it is not a filter on this scan.

Filterpass if premkt vol≥ 50k

Tradeable price

In the range where momentum runs happen and a normal account can take a real position — wide enough to include the optionable names, not just the sub-$20 tape.

Filterpass if price$1 – $100

Has a catalyst

Each row shows whether there is a news headline from the last 24 hours — earnings, an offering, an FDA or contract event. It is shown, not required: a name without news can still make the board.

Flagshown if news≤ 24h

How ours differs

A 5-pillar low-float momentum gap scan of the kind popularized by day-trading educators such as Ross Cameron. This is our own independent implementation, not affiliated with or endorsed by Warrior Trading or Ross Cameron.

• Price runs $1 to $100 here; his published range is $1 to $20.
• Float is capped at 100M shares here; his material prefers a much smaller float than our 100M cap.
• Our relative volume is premarket volume divided by the 10-day average full-day volume. It is a ranking proxy, not his 5x-over-a-30-day-average measure. It ranks the board; it is not a filter on this scan (the Day Trading watch list applies a 0.25x soft floor).
• Each row shows whether there is a news catalyst, but news is not required for a name to appear on the board.

Read the original at warriortrading.com.

No black box — here's the math

Every column on the scanner is a plain, public calculation. We show them all. If we're this open about the free screener, you know the paid tools are built the same honest way.

Gap %

(session price − reference close) ÷ reference close × 100

The true gap versus the session's reference close — yesterday's close for premarket, today's close for after-hours — not the open-to-open gap, so an extending runner reads correctly.

Relative volume (RVOL)

premarket volume ÷ 10-day average FULL-day volume

Premarket volume as a fraction of the stock's 10-day average full-day volume. A ranking proxy, not time-of-day adjusted, and not Warrior Trading's 5x measure. We compute this ourselves rather than using an off-the-shelf relative-volume field, because those are regular-session numbers and read as noise before the bell.

Float

shares available to trade publicly

Free-float shares outstanding. Smaller float means each buy order moves the price more — the amplifier on any catalyst.

ATR (14)

14-period average true range

How much the stock typically moves in a bar — a plain read on how volatile it is, straight off the daily chart.

RSI (14)

14-period relative strength index

The classic momentum oscillator (0–100). Context on whether the move is already stretched or just getting going.

Has news

any headline in the last 24h (Benzinga)

A real, sourced catalyst check on the exact ticker — so a mystery mover without a reason is easy to tell apart from a real story.

Run the top 10 free — no login, no key

The scanner is live as a free, keyless MCP endpoint. Point Claude Desktop, Cursor, or any MCP client at it and just ask “what's gapping?” — it auto-picks the live session and returns the top 10 on the default filters. Premarket 4:00–9:30am ET, after-hours 4:00–8:00pm ET.

{ "mcpServers": { "tradermatrix-free": { "type": "http", "url": "https://api.tradermatrix.pro/api/mcp/free" } } }

On the Claude iOS / Android / web app? The mobile Connectors UI can't take a config file — add this URL instead (Settings → Connectors → Add custom connector), tap Connect free, and you're in. No key, no login:

https://api.tradermatrix.pro/api/mcp/free/connect

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A key unlocks the whole board

The free preview is the same engine, capped. A TraderMatrix API key opens it all up — and hands you the rest of the toolkit.

Tune every filter

Set your own float, price, gap %, and volume floors — dial the screen to your exact playbook instead of the defaults.

Up to 50 results

See the full ranked board, not just the top 10 preview.

More tools

Live options flow, GEX magnet levels, unusual activity, and wheel screeners — the same clean data behind one API key.

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Gamma flips, the levels that matter, the week's catalysts, where money is moving. One email, free, every Sunday at 6:00 PM ET.

SPY is about 1.9% below its gamma flip ($774.42). That is the zone where moves tend to stretch.

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Premarket Gapper Scanner: 5-Pillar Gap Scan | TraderMatrix