# MQL4 RefreshRates()

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This is the markdown version of https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-refreshrates, written from the same records as that page.

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Refreshes the predefined price variables and series arrays that a running program holds its own copy of.

- Function: `RefreshRates()`
- Interface: MQL4
- Group: Prices and bars
- Status: verified. Source: [docs.mql4.com](https://docs.mql4.com/series/refreshrates), checked 2026-10-12.

This is an MQL4 function, not an HTTP endpoint. It has no method, no path and no address to send a request to: it runs inside the MetaTrader 4 terminal, in a program written in MQL4. It is in no OpenAPI file on this site and the request builder does not list it.

Note: The page says an Expert Advisor or script works on its own copy of the data, so one that has been calculating for a long time needs this call before it relies on Bid or Ask again.

## Signature

The form of the call on the vendor's page, with the vendor's comments taken out.

```mql4
bool RefreshRates()
```

## Arguments

The function takes no arguments.

## Return value

- Type: `bool`
- What comes back: True when the data was refreshed, false when it was already current.

## Sample

Written by this site from the signature and arguments recorded on this page. It has not been run against a terminal, a server or an account, and the values in it are placeholders. It holds no credential and needs none: the program runs inside a terminal that is already logged in to an account. Nothing is entered on this site.

```mql4
void OnStart()
  {
   // ... a long calculation ...
   RefreshRates();
   Print("Ask is now ",Ask);
  }
```

## Related MQL4 functions: Prices and bars

- [CopyRates()](https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-copyrates): Copies historical bars of a symbol and timeframe into an array of MqlRates structures, by start position and count, by start time and count, or between two times.
- [iClose()](https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-iclose): Returns the close price of one bar of a symbol and timeframe, counted back from the current bar.
- [MarketInfo()](https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-marketinfo): Returns one item of data about a symbol in the Market Watch window, chosen by a request identifier: a price, or a dealing property such as the stop level.
- [SymbolInfoDouble()](https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-symbolinfodouble): Returns one floating point property of a symbol, chosen by an identifier.
- [SymbolInfoTick()](https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-symbolinfotick): Writes the current prices of a symbol, with the time they were last updated, into an MqlTick structure.

## More on MetaTrader 4

- [All MetaTrader 4 functions](https://openbrokerapi.com/platforms/metatrader-4/functions): 28 documented here, grouped by what they do.
- [All MetaTrader 4 error codes](https://openbrokerapi.com/errors/mt4)
- [MetaTrader 4 API page](https://openbrokerapi.com/platforms/metatrader-4): The full record: access, authentication, limits and the source for each.

## Licence and how to cite

The records behind this page are all rights reserved. This file is the page itself, at its own address, in another format. It is not part of the CC BY 4.0 downloads listed at https://openbrokerapi.com/data. Quote from it with a link to the page.

Cite as: MQL4 RefreshRates(). Broker API Hub, https://openbrokerapi.com/platforms/metatrader-4/functions/mql4-refreshrates, newest check 2026-10-12.

Where you rely on a single figure, cite the source and the checked date printed beside it as well. Where this page and a broker's own documentation differ, the documentation wins.