Deriv Over/Under: How Digit Barrier Contracts Work
Over and Under contracts compare the last digit with a barrier you choose. The barrier sets both your odds and your payout.
Last updated October 28, 2026
The rule
You choose a barrier digit. Over wins if the last digit of the final tick is greater than the barrier; Under wins if it is less than the barrier. A last digit equal to the barrier loses for both.
How the barrier sets the odds
| Contract | Winning digits | Chance per contract |
|---|---|---|
| Over 0 | 1–9 | 90% |
| Over 2 | 3–9 | 70% |
| Over 4 | 5–9 | 50% |
| Over 6 | 7–9 | 30% |
| Under 5 | 0–4 | 50% |
| Under 7 | 0–6 | 70% |
| Under 9 | 0–8 | 90% |
A higher chance comes with a smaller payout, and the reverse. Across all barriers the payout is set so that the long-run average is slightly below break-even. Choosing an "easy" barrier does not create an advantage; it only changes how often you win and how much each loss costs.
Over 4 and Under 5
Over 4 (digits 5–9) and Under 5 (digits 0–4) are the two 50/50 barriers. They are the contracts traded by OverDrive 4 and UnderFive. Both bots read the digit distribution over the last 200 ticks on the 1-second Volatility indices, signal when their side is outnumbering the other under their qualifying rule, confirm the entry, and pause and re-check before continuing.
Practical tips
- Compare barriers by chance × payout, not by chance alone.
- High-chance barriers produce long winning runs and rare, large losses. Size stakes for the losses.
- Test on a demo account first. See Trading Bot Risk Management.