What is a market scanner and how can it help investors find opportunities?
A market scanner automatically filters assets by specific conditions — up 10%, breakout above 52-week high, MA50 crossover. It helps investors surface opportunities from thousands of assets without manual chart-checking.
The problem: too much data, too little time
Financial markets contain an enormous amount of data:
- Crypto market — tens of thousands of tokens actively trading
- US stocks — over 4000 companies listed on NYSE and Nasdaq
- Vietnamese stocks — over 1500 names across HOSE, HNX, and UpCom
- ETFs — over 8000 globally
How do you find opportunities in a data "forest" like this? A retail investor can't open 13,000+ charts a day.
The answer is the market scanner.
What is a market scanner?
A scanner is a tool that automatically filters assets based on specific conditions you define in advance. Instead of reviewing every chart manually, you tell the scanner "I care about this" — and it returns the list of assets that match.
Common conditions:
- Up more than 10% in 24 hours — detect momentum
- Unusual trading volume (over 200% of average) — possible news or large accumulation
- New 52-week high — long-term breakout
- Crossing above MA50 — short-term golden cross
- RSI < 30 or > 70 — oversold/overbought
- Trading volume > $X million — only sufficiently liquid names
You can combine conditions. For example: "Crypto market cap > $1B, up >5% in 24h, volume >150% of weekly average". Results typically narrow to 5-20 names — manageable for deeper review.
Why scanners matter
1. Save time
No need to check each name manually. A single scan runs in seconds and returns results from thousands of names — something you couldn't do by hand in an entire day.
Compound effect: hours saved per week, returned to your main work, family, or deep research on the names that did surface.
2. Discover opportunities earlier
Many assets ripping happen before mainstream financial media catches up. Outlets usually write about a stock after it has already moved 50-100% — too late for a clean entry.
Scanners detect momentum early — when a stock is gradually adding volume and breaking technical resistance, before the headlines.
3. Monitor multiple markets
Modern investors often participate in:
- Cryptocurrency markets
- US stock markets
- Vietnamese stock markets
- ETFs and international indexes
Scanners help track all of them more efficiently — each market with rules tailored to its characteristics.
Read more: Multi-asset investing — the new standard for modern investors.
4. Reduce personal bias
A scanner has no "favorite assets". If BTC doesn't match your criteria, it won't appear in results — even if you hold a lot of BTC. This is a major benefit for anyone prone to confirmation bias.
Common types of scanners
Momentum scanner
Find names rising sharply with high volume. Suits trend traders.
Example criteria:
- Price up >5% in 24h
- Today's volume > 2× 7-day average
- RSI < 75 (not yet overbought)
Breakout scanner
Find names that just broke a key technical resistance. Suits swing traders.
Example criteria:
- Today's close > 52-week high
- Today's volume > average
- Not a penny stock (price > $5)
Reversal scanner
Find names that dropped sharply but show signs of reversal. Suits contrarians.
Example criteria:
- Price down >20% from 3-month high
- RSI < 30 (oversold)
- Rising volume (sign of accumulation)
Fundamental scanner
Find stocks with target financial metrics. Suits value investors.
Example criteria:
- P/E < 15
- Dividend yield > 3%
- ROE > 15%
- Positive revenue growth for 3 consecutive years
Custom multi-criteria
Combine multiple types above with your own rules. This is where scanners become truly powerful — you build a "filter algorithm" matched to your own investing style.
A scanner is not a trading strategy
This is the most important point when using scanners: a scanner only identifies potential opportunities, it doesn't make decisions for you.
A name appearing in scan results doesn't mean "buy now". Final investment decisions still require:
Fundamental analysis
- Business model (stocks) or token utility (crypto)
- Financials: revenue, profit, debt
- Management: leadership quality
- Industry: growth outlook
Technical analysis
- Support/resistance zones
- Long-term vs short-term trend
- Volume profile
- Sensible risk/reward setup
Risk management
- Position size aligned with total portfolio
- Clear stop-loss
- Profit-taking plan
A scanner hands you a list of 10-20 names worth researching. After that, you have to actually do the research — read reports, study charts, assess risk. Skip this step, and the scanner becomes a "slot machine" — picking trending names and hoping.
Read more: 7 crypto investing mistakes beginners should avoid.
Scanners — not part of fastbot
fastbot doesn't include a market scanner — the bot focuses on portfolio tracking, price alerts, and automated DCA. For scanning, look at dedicated platforms:
- TradingView — scanners for crypto + US stocks + Vietnamese stocks, free tier sufficient for individuals
- Finviz — US stocks, strong free scanner
- CoinMarketCap / CoinGecko — filter crypto by basic criteria
- Investing.com — multi-market scanner
- Local market sites for Vietnamese stocks
A common workflow used by many investors:
- Scanner (TradingView, Finviz) surfaces names worth researching
- Watchlist (Notion, Excel, exchange app) stores the names that pass research
- Price alerts (fastbot) on the watchlist — notify when price hits an entry zone
- Order placement (exchange app or fastbot) when the alert fires
Each tool does one thing well — combined, they form a complete workflow.
Read: Why every investor should build a personal watchlist.
Caveats when using scanners
1. Don't trust the numbers blindly
A name "+200% in 24h" could be a pump-and-dump. Unusual volume could be wash trading. A scanner gives data — you must understand context.
2. Avoid "scan fatigue"
Don't run 20 scans/day with 100 different criteria. 1-3 core scans, reviewed weekly — enough.
3. Adjust for market regime
Scanners for bull markets differ from bear markets. In a bear, "breakouts" often fail. In a bull, "oversold" can keep falling. Adjust criteria for the current regime.
4. Backtest before trusting
A scan that "sounds reasonable" isn't necessarily effective. Test it on historical data — see how names that appeared in past results actually performed over the following 1-3 months.
Conclusion
A market scanner is a powerful tool — but not a "magic bullet". It solves the information overload problem by narrowing thousands of assets to a list of 10-20 worth a closer look. This is the first step in the investing process — not the last.
Modern investors don't necessarily need more information — they need the right information delivered at the right time. A scanner for the discovery step, a watchlist for the monitoring step, price alerts for the action step — combined, they form a complete and time-efficient investing workflow.
Next step
Already have a scanner and a watchlist? Need multi-market price alerts to activate that watchlist through Telegram?
👉 Open fastbot — try free for 7 days, no credit card required.