How TheDesperateTrader Works
TheDesperateTrader gives retail day traders the kind of real-time scanning that used to be locked behind expensive institutional terminals, for free. This page explains exactly where our data comes from, how each scanner is calculated, and how we think about accuracy, so you can trust what you see.
Our data sources
We build on a few authoritative, primary sources rather than second-hand aggregators:
- Real-time U.S. market data - live prices, volume and trades across 11,000+ symbols, powering the scanners with no 15-minute delay.
- Exchange halt & resume feeds - the official trading-halt events, with their codes and resume times.
- SEC EDGAR - company filings straight from the source (8-Ks, 10-Qs, Form 4 insider trades, 13F/13D-G institutional holdings) for the catalyst engine, dilution watch and Smart Money tools.
How the RVOL scanner works
Relative volume is computed per minute against a rolling baseline: the average volume for that exact minute of the day across recent sessions. Comparing a stock to its own normal volume for that specific minute is far more accurate than a flat daily average, because early-morning volume is naturally lighter than midday. We then filter out illiquid names and rank by how far above normal each stock is.
How halt detection works
We read exchange halt and resume events as they happen, parse the official code out of each one (LULD volatility, T12 news-pending, and others), and match every halt to its resume so you see how long it lasted, the exact resume time, and the move heading into the halt, more than the exchange status page shows.
How the news-catalyst engine works
When a stock is moving, our catalyst engine reads the structured item codes of its latest SEC 8-K to name the real reason (an acquisition, an offering, a reverse split) instead of guessing from a headline, and it extracts the key facts: the split ratio and effective date, a dividend amount, a deal size. That is the difference between "the stock is up" and knowing why.
Accuracy, freshness & honest limitations
Prices, splits and filings are handled with care: movers are split-adjusted so a reverse split never shows as a fake gain, and end-of-session pages carry an "as of" stamp so you always know how fresh a number is.
We are transparent about what this is and is not. TheDesperateTrader is a data and scanning tool, not investment advice. Nothing here is a recommendation to buy or sell any security, market data can contain errors, and past unusual volume never guarantees a future move. Always do your own research.
Who builds it
TheDesperateTrader is built and run by an active day trader, not a faceless data vendor. It exists because the tools that actually help, real-time unusual-volume scanning, halt tracking, and a straight answer on why a stock is moving, were priced out of reach for most retail traders. Every feature comes from real trading needs, and feedback from users shapes what gets built next.
Frequently asked questions
How TheDesperateTrader's data and scanners work, and how we think about accuracy.
- How is relative volume (RVOL) calculated?
- We compute RVOL per minute against a rolling historical baseline: the average volume for that specific minute of the trading day across recent sessions. Comparing a stock to its own typical volume for that exact minute (rather than to a flat daily average) is far more accurate, because pre-market and early-morning volume is naturally lower than midday volume. An RVOL of 3.0x means the stock is trading at three times its normal volume for that minute.
- How are trading halts detected?
- We read exchange halt and resume events in real time, parse the official halt code out of each event (LULD volatility, T12 news-pending, and others), and match each halt to its resume to show how long it lasted and the exact resume time. We surface more detail than the exchange status pages, including the move into the halt.
- Where does the news and catalyst data come from?
- News is pulled in real time per ticker, and SEC filings come straight from the SEC EDGAR system. Our catalyst engine reads the structured 8-K item codes of a filing to name the real reason a stock is moving (an acquisition, an offering, a reverse split) rather than guessing from a headline, and it pulls out the key facts (ratios, dates, dollar amounts).
- Is the data delayed?
- No. Our real-time scanners run live across the market with no 15-minute delay. Some evergreen list pages (like the daily movers or 52-week pages) settle from official end-of-session data after each close, which we label clearly with an "as of" stamp.
- Is this investment advice?
- No. TheDesperateTrader is a market-data and scanning tool. Nothing on the site is investment, financial, or trading advice, and no output is a recommendation to buy or sell any security. Always do your own research and consider your own risk tolerance.
Institutional-grade scanning, built for retail traders. Free, real-time, no card.
No card · 5 premium daysExplore the market
Free, live market tools. No account required to look.