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MQL5 trade server return code

MQL5 Error 10015: Invalid price in the request

MQL5 error 10015 is TRADE_RETCODE_INVALID_PRICE, the official trade server return code for invalid price in the request. Refresh the quote, use the correct Bid or Ask side for the order type, and align explicit order prices to SYMBOL_TRADE_TICK_SIZE. For market operations, follow the request rules for the symbol execution mode instead of sending a stale price. Read MqlTradeResult.retcode after OrderSend because a successful function return does not by itself mean that the order was executed.

Open MQL5 Coding AgentReview the diagnostic example

Open the Coding Agent and choose MQL5 from the language menu.

Check retcode 10015.mq5
MqlTick tick={};
if(!SymbolInfoTick(_Symbol,tick))
  {
   PrintFormat("No quote for %s, error=%d",_Symbol,GetLastError());
   return;
  }

double tick_size=SymbolInfoDouble(_Symbol,SYMBOL_TRADE_TICK_SIZE);
double buy_price=MathRound(tick.ask/tick_size)*tick_size;
PrintFormat("ask=%.*f aligned=%.*f",_Digits,tick.ask,_Digits,buy_price);
  • Official code: TRADE_RETCODE_INVALID_PRICE
  • Meaning: Invalid price in the request
  • Layer: trade server response
  • Verify: MqlTradeResult.retcode

What error 10015 actually reports

The code belongs to MqlTradeResult.retcode, not to the compiler error list and not necessarily to GetLastError. The trade server uses 10015 to report invalid price in the request.

Keep the request, the boolean returned by OrderSend, result.retcode, result.comment, and the symbol properties in the same log record. That separates a client-side request failure from a server-side rejection.

Inspect the request before changing the strategy

Use the smallest failing order and compare every broker-sensitive value with the current symbol and account. Do not hide the error by retrying unchanged input.

  • Confirm SymbolInfoTick succeeds and the quote values are positive.
  • Use Ask for buy-side calculations and Bid for sell-side calculations where the operation requires a price.
  • Align pending-order prices to SYMBOL_TRADE_TICK_SIZE.
  • Rebuild the request after a quote change instead of retrying the stale structure.

Repair and verify

Refresh the quote, use the correct Bid or Ask side for the order type, and align explicit order prices to SYMBOL_TRADE_TICK_SIZE. For market operations, follow the request rules for the symbol execution mode instead of sending a stale price.

Run OrderCheck with the completed request, log its retcode and comment, then send only if the check is acceptable. OrderCheck improves diagnostics but does not guarantee execution.

Use a focused diagnostic

The example obtains one coherent tick and aligns an explicit price to the tradable tick size. The final request still needs the correct action, order type, and execution-mode rules.

A valid request can still be rejected or filled differently by the trade server. Check the returned retcode, test with the broker symbol and account, and review risk before any live order.

Check retcode 10015.mq5
MqlTick tick={};
if(!SymbolInfoTick(_Symbol,tick))
  {
   PrintFormat("No quote for %s, error=%d",_Symbol,GetLastError());
   return;
  }

double tick_size=SymbolInfoDouble(_Symbol,SYMBOL_TRADE_TICK_SIZE);
double buy_price=MathRound(tick.ask/tick_size)*tick_size;
PrintFormat("ask=%.*f aligned=%.*f",_Digits,tick.ask,_Digits,buy_price);
Where Pineify fits

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Pineify can generate or revise MQL5 source and use MQL5 compilation diagnostics during the coding workflow. Keep the exact error, source location, program type, and intended behavior in the request so the change remains reviewable.

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A practical verification workflow

  1. 1

    Capture the complete result

    Log the OrderSend return value, result.retcode, result.comment, symbol, order type, volume, price, stops, and filling mode. Confirm that the retcode is 10015.

  2. 2

    Read current constraints

    Query the symbol and account immediately before building the request. Broker constraints can differ between symbols and sessions.

  3. 3

    Change the invalid field

    Refresh the quote, use the correct Bid or Ask side for the order type, and align explicit order prices to SYMBOL_TRADE_TICK_SIZE. For market operations, follow the request rules for the symbol execution mode instead of sending a stale price.

  4. 4

    Check, send, and retest

    Call OrderCheck, submit the corrected request, then reproduce it in Strategy Tester and a demo account before considering live use.

Frequently asked questions

What does MQL5 error 10015 mean?

It is TRADE_RETCODE_INVALID_PRICE, the official MQL5 trade server return code for invalid price in the request.

Is 10015 a GetLastError code?

Treat it as a trade server return code when it appears in MqlTradeResult.retcode. GetLastError reports the terminal runtime error layer, which is a separate diagnostic channel.

Does OrderSend returning true mean the trade executed?

No. The official OrderSend reference says true means the request passed basic checks and was accepted for processing. Inspect result.retcode and subsequent trade events to determine the outcome.

Last verified against the linked official references on . Compile and test the final source in the MetaTrader 5 build, broker, symbol, and account environment you plan to use.

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Provide the exact diagnostic and intended behavior, inspect the generated change, compile it, and verify it in your MT5 test environment.

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