Options Flow and Market Scanners Explained

Options-flow tools and market scanners look across the whole market for unusual activity: big options trades, sudden volume, large off-exchange stock trades and insider filings. They're popular with traders who want to know where "big money" is moving. This guide explains what the data shows, where it comes from, what it can't tell you, and what the tools cost.

OOSClub lists trading software, never signal groups or managed accounts, and we never publish a tool's results. Nothing here is financial advice.

Options flow and unusual options activity#

Options flow is a live feed of options trades. Flow tools take trade data from the US options exchanges, which OPRA consolidates, and filter it to highlight trades that look unusual: large in size or dollar value, far from the current price, or heavy for that contract.

Terms you'll see:

• Volume vs open interest. Volume counts contracts traded today; open interest counts contracts still open. When today's volume on a contract is far above its open interest, flow tools often flag it as unusual.
• Sweeps. A large order split up and filled across several exchanges at once, often read as urgency.
• Blocks. A single large trade, often negotiated.
• Bought at the ask vs sold at the bid. Tools guess whether a trade was a buy or a sell from where it filled relative to the quote.
• Premium. The total dollars paid for the trade, a rough measure of size.

What flow can't tell you#

This is the part flow marketing skips. Public options trade data doesn't show why a trade was made:

• Opening or closing? A big trade can be a new position or someone closing an old one. Cboe sells a separate open-close volume report precisely because the regular trade feed doesn't say.
• A bet or a hedge? A large put purchase might be protection for a stock position the trader owns, not a bet that the stock falls.
• Part of a bigger trade? Multi-leg strategies print as separate legs, so one side of a spread can look like a standalone bet.
• Who's behind it? Flow is anonymous. "Smart money" labels are the tool's guess.

So treat unusual activity as a clue worth checking, not as a prediction or a reason to copy a trade. Our guide to options basics explains how options work and the risks.

Dark pools and off-exchange trades#

Dark pools are alternative trading systems (ATSs): electronic venues that match buyers and sellers without showing orders publicly. Investor.gov notes that all current ATSs are dark pools. Their trades are reported after they happen, and flow tools show large ones as "dark pool prints."

Two limits to keep in mind:

• A print is a trade that already happened, not an order waiting to fill, and it doesn't show whether it was a buy or a sell.
• Detailed venue data is delayed. FINRA publishes ATS and off-exchange volume by venue on a delay of two to four weeks.

Insider-trade dashboards#

Some tools show "insider trades." These come from public SEC filings: company officers, directors and holders of more than 10% generally must report their trades on Form 4 within two business days, and anyone can read them on the SEC's EDGAR site. A dashboard makes them easier to scan, but it's public information, not a tip. Anyone selling real non-public information would likely be breaking the law.

Stock scanners#

Scanners search the market for stocks matching conditions you set: price moves, volume spikes, gaps, new highs, technical patterns or news. Some run inside charting platforms; others are standalone apps or Discord bots that post alerts. Scanners save time, but every alert still needs your own judgment, and a fast-moving list of "hot" stocks can push you toward rushed trades.

Data delays#

Free and cheap tools often show delayed data. Real-time options data carries per-user exchange fees, so free plans often lag by 15 minutes or more. Unusual Whales' free plan, for example, delays options flow by two days and alerts by 30 minutes. Check how current the data is before you rely on it.

What these tools cost#

A few examples from each tool's own pricing page, as of October 2026, alphabetically:

Sources for each are below the guide.

What to check before you pay#

1. Real-time or delayed? And for which data: stocks, options, dark pools.
2. Where the data comes from, and whether the tool explains how it labels trades as bullish or bearish.
3. The platform: web, app or Discord, and whether alerts can be filtered to what you trade.
4. Trial and refund terms.
5. The claims. "Follow the smart money" and win-rate marketing are claims, not evidence. Our guide to spotting trading scams covers the red flags.

Charting indicators are a different kind of tool; our guide to trading indicators and algos explains them.

To try a scanner or alert tool without risking money, see our guide to backtesting and paper trading.

Trading tools on OOSClub#

The stocks and options niche lists scanners and options-flow tools alongside indicators, with what each says it does, its data and platforms, its plans and refund terms. We never publish a tool's results; any results claim is labeled as the seller's claim.