How Over/Under contracts work
An Over/Under contract is a bet on the last digit of the final tick price. You choose a digit from 0 to 9 and predict whether the last digit will be over it or under it when the contract ends.
For example, if Volatility 10 (1s) ends at 6,245.34, the last digit is 4. A Digit Under 7 contract wins, because 4 is under 7. If it ends on 7, 8 or 9, the contract loses.
What the Digit Nexus AI bot does
| Setting | Value in the bot |
|---|---|
| Market | Volatility 10 (1s) index |
| Contract | Digit Under, prediction 7 |
| Duration | 2 ticks |
| Money management | Martingale step after a loss, with a maximum-stake cap |
| Stops | Profit threshold and loss threshold that end the session |
After each trade the bot checks the session total. If it reaches your profit threshold or loss threshold, it stops and tells you why. After a loss it increases the next stake by the martingale size, but if that would go past your max stake, it resets the stake instead of chasing the loss further.
Settings to check before you run it
- Initial stake: the first stake of every cycle. Deriv's minimum is 0.35 USD.
- Martingale size: how much the stake grows after a loss. Lower means slower growth and less risk.
- Max stake: the ceiling. This is your most important safety setting.
- Profit and loss thresholds: when the bot stops for the session. Set the loss threshold to an amount you can afford to lose.
The odds, honestly
If last digits were spread evenly, Under 7 would win on seven of ten digits (0 to 6), about 70% of the time. Deriv prices the payout to match that probability, so each win pays well under your stake. That means a single loss can wipe out the profit from several wins, which is why the martingale step and the max-stake cap matter so much.
"AI" in the bot's name refers to its automated decision rules. It does not predict digits. Synthetic index prices are generated to be random.
Also free: Vertex Digits
Vertex Digits is the Quick Bot in the library. It trades Over/Under on Volatility 100 with 1-tick contracts. Before each trade it measures how often each digit (0 to 9) has appeared in the recent ticks it analyses, and uses those percentages to choose an over or under entry. Set its initial stake and stop loss before you run it.
Tips for Over/Under bots
- Lower predictions such as Over 2 or Under 7 win more often but pay less. Extreme ones such as Over 8 pay a lot but rarely win.
- Faster (1s) markets mean more trades per minute, so losses can also build faster. Watch the run panel.
- Stop after hitting your daily target. More trades do not improve your odds.
Frequently asked questions
Which market does the Over/Under bot trade?
It trades Volatility 10 (1s), a Deriv synthetic index that ticks every second.
Can I change Under 7 to another digit?
Yes. Open the bot in the bot builder and change the prediction in the trade options block. Remember that the payout changes with the digit.
What is a good stake for this bot?
Start with the minimum stake on a demo account. Choose a real stake so that your max stake and loss threshold together are an amount you can afford to lose.
Is the Over/Under bot free?
Yes. Load it free from the Free Bots tab after logging in with your Deriv account.