ordersend

Ответ от Ewe 2e¶ CoЛнЫшКоcBeTиТоЧеНЬяРкО*[гуру]
Используйте функцию AccountFreeMarginCheck:
Returned value: Free margin that remains after the specified order has been opened at the current price on the current account. If the free margin is insufficient, an error 134 (ERR_NOT_ENOUGH_MONEY) will be generated.
Example:
if(AccountFreeMarginCheck(Symbol(),OP_BUY,Lots)<=0 || GetLastError()==134) return;
docs .mql4 .com/account/accountfreemargincheck и Гугл