This is an important setting. Each broker has a different max lot size you can open. You will need to specify its limit here. Otherwise, bot will not be able to open the desired lot size and can cause financial loss.

For example, broker max lot size is 200.

At this time, you have 9 martingale open, and the 10th one will open at lot size 230. If you don’t specify the BrokerMaxLotSize, bot will attempt to open lot size 230 which will fail.

If you specify BrokerMaxLotSize to 200, what bot will do, it will open 2 positions instead:

• 1 x 200
• 1 x 30

This will allow bot to continue trade and overcome the broker max lot size limit.

In the case of each pair has a different max lot size, you can also specify it here in the format below:

EURUSD-200;XAUUSD-100;GBPUSD-200

What it means is, you tell the bot that for EURUSD, max lot size is 200. For XAUUSD, it is 100. For GBPUSD it is 200.

Some brokers enforce different max lot size on various pairs.