Fixed expiry is a type of trades in Binary Options.

Regular binary options trade is made for the next 60 seconds.

We call it ‘after 60-sec’ trade. In that regular trade, the bet is closed in 60 seconds (or 59 with some brokers) after you have opened it.
In the same way, some brokers allow you to make ‘after 2-min’ or ‘after 5, 10, 15-min’ trades.
For example, you have opened a 60-sec trade at 12:05:53. It will close at 12:06:53.
The same for the ‘after 10-min’ trade.
For example, you have opened a 10-min trade at 12:05:53. It will close at 12:15:53.

Why is that bad for signals service and for you?

As you can see in every example we have seconds. But the problem is that the broker and third-party services do not show you the exact price for seconds. The minimum they show you the range in the 1-minute candle with min and max prices. You cannot re-check what price was at 12:15:53 or 12:06:53. You can check the range.
Some brokers show you the prices for seconds but third-party service no. Thus you cannot recheck the broker or binary options signals service and they can cheat you.

Trades with fixed expiry

In the trades with fixed expiry, you close the trade at the exact time. It can be the end of 2 min candle, 5min candle, 10 min, 15, 1 hour and etc.

For example, you have opened a trade at 12:05:53 with the fixed expiry on the end of the current 10 min candle. The trade will be closed at 12:09:59 or 12:10:00. And the price for that time you can re-check with any third-party system!
The same for trade with fixed expiry on the end of the 15-minute candle.
For example, you have opened a trade at 12:05:53 with the fixed expiry on the end of the current 10 min candle. The trade will be closed at 12:14:59 or 12:15:00. And the price for that time you can re-check with any third-party system!

95% of brokers allow you to make trades with fixed expiry!

Some of them simply hide that possibility to make you trade just 60 sec. That’s makes you to run more trades. Think less and lose more money!

By the way CySEC tried to close brokers who offer 60 sec trades few times. Think of that!