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October 22, 2026FrançaisEspañol

RSI crossing 30 and 70: what it is, and how to test it

The RSI is a 0 to 100 gauge of how one-sided recent closes have been. Readings under 30 are called oversold and over 70 overbought. QuantLogic counts the bar where the RSI crosses into those zones, and the bars it spends beyond 80 or under 20. Here are the exact rules.

RSI(14) now under 30RSI < 30
The level the idea readsThe bar where the idea firesA drawn example, not market data.

What it is

RSI(14) compares the average gains and losses of the last 14 closes. Falling closes push it down, rising closes push it up.

Oversold and overbought are names, not predictions: the RSI can stay low while price keeps falling.

The exact rule QuantLogic uses

RSI(14) crossed below 30, on one-minute or five-minute bars. Crossed above 70 is the mirror image.

  1. The RSI(14) of the bar's timeframe is under 30 at this bar.
  2. It was not under 30 at the bar before.
  3. Above 80 and below 20 are different ideas: every bar while the RSI stays beyond that level.

When is it known? Known when the bar closes. The five-minute RSI uses the last five-minute bar already closed.

Versions you can build

  • RSI(14) 1-min crossed below 30. The first one-minute bar under 30.
  • RSI(14) 1-min crossed above 70. The first one-minute bar over 70.
  • RSI(14) 5-min crossed below 30 / above 70. The same on five-minute bars.
  • RSI(14) above 80 / below 20. Every bar while it stays beyond, on 1 or 5 minutes.

What to look at around it

In QuantLogic, every time the idea happened is laid out with the data points around it, so you can see where it held and where it didn't:

Time of day and sessionEconomic calendar and newsVWAP distanceGamma regime, flip and wallsYesterday's value area and pivotsVolatilityNQ vs ES since the openUp or down on the day

Traps when you test it

  • Treating oversold as a buy. In a strong fall the RSI can stay under 30 for a long time.
  • Mixing timeframes. A one-minute cross and a five-minute cross are different events.
  • Testing only one side. Check the crosses above 70 too.

Build it and test it yourself

Open RSI(14) 1-min crossed below 30 in Build with QuantLogic. See every time it happened on NQ, ES, Gold or Crude since September 2025, check the long and the short side, add your own filters and run the luck test.

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Nothing is proven until it holds live. We give no trading signals and no advice, we never hold your money or your accounts, and we never trade for you.

Questions

Which RSI does QuantLogic use?
RSI with a 14-bar period, on one-minute or five-minute closes.
Is the cross the bar under 30, or the bar after?
The first bar whose RSI is under 30, at its close.

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Educational content, not investment advice. Futures trading involves substantial risk of loss. See the risk disclosure.