Definition
What is a stock scanner?
A stock scanner repeatedly evaluates changing market data against defined conditions. Unlike a point-in-time stock screener, it can publish a new timestamped event when a supported price, volume, VWAP, breakout, news, or halt condition qualifies.
Who it is for
Built for active traders who verify the evidence.
TraderBase is built for active traders who need to reduce a large market universe to a focused list of measurable events, then inspect each symbol with charts, liquidity, news, filings, offerings, and halt context before making an independent decision.
How it works
From changing data to a focused review.
- 1Choose an implemented preset or configure supported scanner criteria.
- 2The authoritative market engine evaluates normalized, timestamped provider data.
- 3Qualifying current-state rows and distinct events appear with their measured trigger and recency state.
- 4Open a symbol in linked chart and market context, then monitor it with a watchlist or alert.
Capabilities
The information connected to this workflow.
Momentum and breakout events
Monitor implemented high-of-day, running-up, opening, VWAP, and other price-event conditions.
Volume and float context
Use supported absolute volume, relative volume, dollar volume, float, market-cap, and liquidity fields without inventing missing values.
Premarket and regular sessions
Keep session boundaries explicit when reviewing gappers, movers, breakouts, and current prices.
Scanner-to-chart validation
Carry the selected ticker into charts, VWAP, news, filings, offerings, halt status, Time & Sales, and available quote context.
TraderBase approach
What makes TraderBase different?
TraderBase keeps detection and explanation separate. Deterministic services calculate market values and scanner matches. TradeBase Agent can organize the resulting evidence and identify missing or delayed context, but it does not alter the scanner result or recommend a trade.
Common questions
Stock scanner FAQ
What is the difference between a stock scanner and a stock screener?
A screener usually returns a point-in-time filtered list. A scanner evaluates supported data repeatedly and can preserve separate timestamped events as conditions change.
Is TraderBase market data always real time?
Free market data is delayed by 15 minutes. Gold includes real-time market data.
Does a scanner match mean a stock should be traded?
No. A match reports that available data satisfied configured conditions. It is not a recommendation, prediction, or instruction to buy or sell.