How to know the Minimum Distance?

Is there a function that will give me the "at least 3 pips" number as shown below?

Here's the information you're looking for.

Specifically:
"At placing of a pending order, the open price cannot be too close to the market. The minimal distance of the pending price from the current market one in points can be obtained using the MarketInfo() function with the MODE_STOPLEVEL parameter."