---
title: Exchange
description: "The exchange is a **FUNDAMENTAL** attribute of the instrument. *Defining it incorrectly or defining properties such as session or time-zone incorrectly results in the incorrect display of charts, DOM and anything else concerning the instrument.* In Overcharts, an exchange groups…"
url: "https://www.overcharts.com/en/helpcenter/docs/exchange/"
updated: "2021-05-21"
category: Instruments
---

# Exchange

The exchange is a **FUNDAMENTAL** attribute of the instrument. *Defining it incorrectly or defining properties such as session or time-zone incorrectly results in the incorrect display of charts, DOM and anything else concerning the instrument.*

In Overcharts, an exchange groups together a set of properties common to all instruments belonging to the exchange.
All instruments of a given exchange inherit the properties defined in the exchange configuration, unless otherwise specified in the instrument configuration.

#### **Access exchange list**

You can access exchange list in one of the following ways:

**1.** From *Overcharts main window* >***Instrument*****s**Tab > ***Exchanges***button

**2.** From *Overcharts main window* > ***Instruments*** menu > *Exchanges*

#### **Create or Modify an exchange**

To create/modify an exchange:

**1.** Access exchange list

**2.** Select the exchange to edit and press **Edit** button, or press **New** button to create a new exchange

**3.** Set or change the following properties:

**Name**: exchange unique name

****Symbol (abbreviation)****: unique code of a few characters to identify the exchange in Overcharts

**Currency**: exchange currency. This property is only enabled creating the exchange and cannot be changed later

**Time-Zone**: exchange time-zone

Exchange time zone **MUST** be the time-zone where the exchange is based. For example, **CME** time zone is U.S. Central Time (***Chicago*** time-zone). **Nasdaq** or **NYSE** time-zone is Eastern Standard Time (***New York*** time-zone) etc.

**Session**: weekly trading session (trading hours) defines the days and hours when the exchange is open

The **Session** is a **FUNDAMENTAL** attribute of an exchange/instrument. It affects data loading and charts displaying. If defined incorrectly, DOM, Charts etc. will NOT be displayed correctly

**Holidays list**: contains all exchange's holidays. It affects data loading and charts displaying of each instrument belonging to the exchange.

**Tick-Size**: minimum price movement. Each instrument has its own tick-size. A default used by the instrument creation procedure is specified here, in case a specific tick-size is not defined for the instrument being created

**Point Value**: cash value of 1 point. Each instrument has its own Point Value. It is used for futures (for shares or other type of instrument the value is always 1). A default used by the instrument creation procedure is specified here, in case a specific point-value is not defined for the instrument being created

**Overcharts already contains some preconfigured exchanges. Preconfigured-exchanges properties can be modified by the user, but if you modify them, any future property updates will NOT be applied.*
You can restore the default configuration of a preconfigured exchange at any time by selecting the exchange from exchange list and pressing the **Restore Standard** button.*