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 fewer digits win, while the payout rises.

Matches and Differs ask whether the digit is exactly one you name. Matches wins on one digit in ten. Differs wins on 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 has more than 30 digit bots across Over / Under, Even / Odd and Matches / Differs. These six are the place to start, each with its rule on its card:

• Under 8 buys Under 8 on every trade. Eight winning outcomes in ten, with small wins and a larger loss when the digit lands on 8 or 9.
• 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. Over 3 wins on six digits and Under 7 on seven.
• Digit Differs reads the digit from the last trade and bets the next one differs from it. It wins on nine digits out of ten.
• Lucky Digit bets the next digit is exactly the barrier you picked. It wins on one digit in ten, paying about nine times the stake.
• Even / Odd Switcher buys Even until a trade loses, then switches to Odd, and keeps alternating.

One thing worth knowing about digits

Several of these strategies read the previous digit and decide from it. It is worth being precise about what that gets you, because it is the most common point of confusion in digit trading.

Digits on a synthetic index are independent. The digit that just appeared does not influence 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".

What a rule like the Even / Odd Switcher gives you, then, is not a forecast. It is a consistent, readable pattern of contract selection, which is exactly what makes a strategy testable: you can run it, see how it behaves, and change one setting at a time.

The same applies to Over 3 / Under 7. Alternating on the last digit produces a particular mix of contract types, and therefore a particular blend of winning digits and payout. That blend is the thing you are choosing.

Choosing between them

The useful question is what kind of ride you want to sit through.

A contract that wins on most digits, such as Under 8 or Digit Differs, gives you frequent small wins broken by occasional larger losses. It feels steady.

A contract that wins on few digits, such as Lucky Digit, gives you long stretches of nothing followed by a large win. It is a bumpier ride, and it shows you its risk up front rather than hiding it in a rare loss.

Lucky Digit's losing runs are long by design, so it ships with a gentle 1.2x martingale, sized to win back a losing run of up to six trades inside its stop loss.

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 winning stretches and the losing ones, and you will get a feel for how far a hit rate can swing over a short run.

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