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MetaTrader error codes / MT4 runtime errors

MT4 error 4107: Invalid price parameter for trade function (ERR_INVALID_PRICE_PARAM)

The terminal refused the price you passed to a trade function, often because it isn't normalized. Nothing was sent.

4107ERR_INVALID_PRICE_PARAM
After a fixSafe to retry?
NoCould it have executed?

What it means

You see this code in GetLastError() in MQL4, raised inside the terminal.

4107 comes from the terminal, before the request leaves. The price argument isn't valid as written.

It is close to server error 129, but caught earlier.

Common causes

  • A price with more decimals than the symbol's Digits.
  • A price of 0 or a negative price.
  • A price for another symbol, read from Ask or Bid of the chart symbol.

How to fix it

  • Normalize every price with NormalizeDouble(price, Digits).
  • For another symbol, read its price and digits with MarketInfo().

Example in MQL4:

string sym = "USDJPY";
int    dg  = (int)MarketInfo(sym, MODE_DIGITS);
double bid = NormalizeDouble(MarketInfo(sym, MODE_BID), dg);
double sl  = NormalizeDouble(bid + 0.30, dg);
int ticket = OrderSend(sym, OP_SELL, 0.10, bid, 3, sl, 0, "", 4711);

Is it safe to retry?

After a fix. With a valid, normalized price.

Could the order have executed?

No. The terminal rejected the price argument before sending anything.

How Tickwire handles it

Tickwire treats it like MT5 10015, and the MT4 code stays in the message. See trade results.

All MetaTrader error codes

One API for MT4 and MT5

Clear trade outcomes, idempotent orders and an audit log. Read the error reference or the quickstart.

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