What Is Support?
Support is a price level where buying interest is strong enough to prevent further price decline. Think of it as a floor — price falls to the level, buyers step in, and price bounces. Support forms at previous swing lows, round numbers, moving averages, and areas of historical price congestion.
How Support Works
When price approaches a support level, buyers who missed previous entries place orders, short sellers take profits, and bargain hunters emerge. This concentration of buy orders creates a barrier against further decline. Like resistance, the more times support is tested, the more significant it becomes — but repeated testing also absorbs buy orders, weakening the level.
Why It Matters for Traders
Support levels are key decision points for entries. Traders buy at support with stops placed just below. When support breaks, it often becomes resistance (a "flip"). In crypto, support levels where significant open interest is concentrated often coincide with liquidation clusters — when they break, the cascade of forced selling amplifies the move.
How Perps Traders Use This
For CEX perpetual futures, treat support as context around entries, exits, and risk, not as a standalone signal. Pair it with funding, open interest, and liquidation heat so one indicator does not drive the whole book.
Formula and Worked Example
Example numbers only (not a live quote).
If your account equity is $10,000 and you risk 0.5% per idea, the cash risk budget is $50. With a stop 1% away from entry on a linear USDT-margined perp, notional size is about $5,000 before leverage optics. Size from stop distance first, then pick leverage that fits the margin mode.
Common Mistakes
- Treating a single print of support as a trade signal without checking funding, open interest, and your liquidation price.
- Mixing venue conventions (coin-margined vs USDT-margined, cross vs isolated) and reading the wrong mark.
- Copying example numbers from a glossary into live size without checking the current book depth and fee schedule.
- Ignoring related terms that change the meaning of the print on a given day.
