Most spread guards in an Expert Advisor work the same way: check the current spread against a fixed number and block the trade if it is too wide. This catches some bad fills, but it treats every instrument as if the same spread value means the same thing everywhere. A spread of 3 pips on an instrument that normally trades at 1 pip is a genuine anomaly. That same 3-pip spread on an instrument that normally sits at 3 pips is completely ordinary. A static threshold cannot tell the difference. ...
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