Deriv digit bots explained: Over, Under, Matches, Differs and Even Odd

Digit contracts are the most popular basis for Deriv bots, and the least understood. They are also the easiest to reason about clearly, because the outcome space is small enough to hold in your head.

The last digit

Every tick on a synthetic index has a price, and every price has a last digit. A tick priced at 730.98 has a last digit of 8.

Digit contracts settle on that number. There are exactly ten possible outcomes, 0 through 9, and on a synthetic index each one is equally likely and independent of the tick before it. That is the whole mechanism.

The contract types

Over and Under ask whether the digit lands above or below a barrier you pick. Under 8 wins on digits 0 through 7, which is eight outcomes in ten. Over 1 wins on digits 2 through 9, also eight in ten. Push the barrier toward the middle and the win rate falls while the payout rises.

Matches and Differs ask whether the digit is exactly one you name. Matches wins one time in ten. Differs wins the other nine.

Even and Odd ask which side the digit falls on. Five outcomes each way, so close to a coin flip, with 0 counted as even.

What the ready-made bots do

BinaryTick ships several digit strategies, each stating its rule on the card:

• Under 8 buys Under 8 on every trade. Eight winning outcomes in ten, and the card notes that one loss wipes out several wins.
• Over 1 is the mirror, running on a one second market where ticks arrive far faster, so both wins and losses accumulate more quickly.
• Over 3 / Under 7 reads the digit from the last trade and alternates. If it was 0 to 3 the next trade is Over 3, otherwise it is Under 7. The card gives its blended hit rate as around 66%.
• Digit Differs reads the digit from the last trade and bets the next one differs from it. About nine wins in ten.
• Lucky Digit bets the next digit is exactly the barrier you picked. Roughly one win in ten, paying about nine times the stake.
• Even / Odd Switcher buys Even until a trade loses, then switches to Odd, and keeps alternating.

The pattern that is not there

Every one of these strategies reads the previous digit and makes a decision based on it. It is worth being precise about what that does, because it is the most common misunderstanding in digit trading.

Digits on a synthetic index are independent. The digit that just appeared tells you nothing about the next one. A digit that has not appeared for fifty ticks is not "due", and one that has appeared three times running is not "hot".

So the Even / Odd Switcher's rule of flipping sides after a loss does not improve its odds. The card says as much: switching sides changes nothing about the odds, only how the run feels.

The same applies to Over 3 / Under 7. Alternating based on the last digit produces a particular mix of contract types, and therefore a particular blend of hit rate and payout. It does not predict anything.

Choosing between them

Since none of them have an edge, the useful question is what kind of variance you want to sit through.

A high hit rate strategy such as Under 8 or Digit Differs gives you frequent small wins broken by occasional larger losses. It feels steady, and it is the easiest to over-trust.

A low hit rate strategy such as Lucky Digit gives you long stretches of nothing followed by a large win. It feels worse and reveals its risk honestly, which is arguably safer.

The card for Lucky Digit carries a specific warning worth repeating: long losing runs are normal, so leave the martingale multiplier at 1 unless you understand the cost.

The practical advice

Digit contracts are a clean way to learn how variance behaves, because the probabilities are transparent and the trades resolve in seconds. Run one on a demo balance and watch a few hundred trades. You will see the losing runs, and you will see that the hit rate on the card is honest and still not enough.

That lesson transfers to every other contract type, where the maths is less visible but works the same way.