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Broker-API.md

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💹 All content on this page is related to Trading Terminal only.

Broker API is a key component that enables live trading. Its main purpose is to connect our charts with your trading logic. In terms of JS, it is an object which is expected to expose the specific interface. Here is a list of API's methods that Terminal is expected to have.

Required Methods

constructor(host)

The constructor of the Broker API usually takes Trading Host.

positions : Promise<Position[]>

This method is called by the Trading Terminal to request positions.

orders : Promise<Order[]>

This method is called by the Trading Terminal to request orders.

executions(symbol) : Promise<Execution[]>

This method is called by the Trading Terminal to request executions.

trades : Promise<Trade[]>

This method is called by the Trading Terminal to request trades (individual positions).

chartContextMenuActions(e)

  • e is a context object passed by a browser

Chart can have a sub-menu Trading in the context menu. This method should return an array of ActionMetainfo elements, each of them representing one context menu item.

connectionStatus()

You don't need to return values other than 1 typically since the broker is already connected when you create the widget. You can use it if you want to display a spinner in the bottom panel while the data is being loaded. Possible return values are:

ConnectionStatus.Connected = 1
ConnectionStatus.Connecting = 2
ConnectionStatus.Disconnected = 3
ConnectionStatus.Error = 4

isTradable(symbol): Promise<boolean | IsTradableResult>

This function is required for the Floating Trading Panel. The ability to trade via the panel depends on the result of this function: true or false. You don't need to implement this method if all symbols can be traded.

If you want to show a custom message with the reason why the symbol cannot be traded then you can return an object IsTradableResult. It has only two keys: tradable (true or false) and reason (string).

accountManagerInfo()

This function should return the information that will be used to build an account manager. See Account Manager for more information.

placeOrder(order, confirmId)

Method is called when a user wants to place an order. Order is pre-filled with partial or complete information.

confirmId is passed if supportOrderPreview configuration flag is on.

previewOrder(order)

Returns estimated commission, fees, margin and other information for the order without it actually being placed. The method is called if supportOrderPreview configuration flag is on. The result will be an object with the following fields:

  • confirmId - a unique identifier that should be passed to placeOrder method
  • info - information about the order, which is a table that has the following structure: OrderPreviewInfoItem[].

modifyOrder(order)

  1. order is an order object to modify

Method is called when a user wants to modify an existing order.

cancelOrder(orderId)

This method is called to cancel a single order with a given id.

cancelOrders(symbol, side, ordersIds)

  1. symbol - symbol string
  2. side: Side constant or undefined
  3. ordersIds - ids already collected by symbol and side

This method is called to cancel multiple orders for a symbol and side.

editPositionBrackets(positionId, brackets, customFields)

  1. positionId is an ID of an existing position to be modified
  2. brackets - new brackets.
  3. customFields - CustomInputFieldsValues or undefined

This method is called if supportPositionBrackets configuration flag is on. It shows a dialog that enables take profit and stop loss editing.

closePosition(positionId)

This method is called if supportClosePosition configuration flag is on. It allows to close the position by id.

reversePosition(positionId)

This method is called if supportNativeReversePosition configuration flag is on. It allows to reverse the position by id.

editTradeBrackets(tradeId, brackets)

  1. tradeId is ID of existing trade to be modified
  2. brackets - new brackets.

This method is called if supportTradeBrackets configuration flag is on. It displays a dialog that enables take profit and stop loss editing.

closeTrade(tradeId)

This method is called if supportCloseTrade configuration flag is on. It allows to close the trade by id.

symbolInfo(symbol) : Deferred (or Promise)

  1. symbol - symbol string

This method is called by the internal Order Dialog, DOM panel and floating trading panel to get symbol information.

The result is an object with the following data:

  • qty - object with fields min, max and step that specifies Quantity, field step and boundaries.
  • pipSize - size of 1 pip (e.g., 0.0001 for EURUSD).
  • pipValue - value of 1 pip for the instrument in the account currency.
  • minTick - minimal price change (e.g., 0.00001 for EURUSD). Used for price fields.
  • description - a description to be displayed in the dialog.
  • type - instrument type, only forex matters - it enables negative pips. You can check that in the order dialog.
  • domVolumePrecision - number of decimal places of DOM asks/bids volume (optional, 0 by default).
  • marginRate - the margin requirement for the instrument. A 3% margin rate should be represented as 0.03.
  • stopPriceStep - minimal price change for stop price field of the Stop and Stop Limit order. If set it will override the minTick value.
  • limitPriceStep - minimal price change for limit price field of the Limit and Stop Limit order. If set it will override the minTick value.
  • allowedDurations - array of srtings with valid duration values. You can check that in the order dialog.

accountInfo() : Deferred (or Promise)

This method is called by the internal Order Dialog to get the account information. It should return only one field for now:

  1. currencySign: string - which is a sign of account currency

Once this method is called the broker should stop providing profit/loss.

subscribeEquity()

The method should be implemented if you use the standard order dialog and support stop loss. Equity is used to calculate Risk in Percent.

Once this method is called the broker should provide equity (Balance + P/L) updates via equityUpdate method.

unsubscribeEquity()

The method should be implemented if you use the standard order dialog and support stop loss.

Once this method is called the broker should stop providing equity updates.

subscribeMarginAvailable()

The method should be implemented if you use the standard order dialog and want to show the margin meter.

Once this method is called the broker should provide margin available updates via marginAvailableUpdate method.

unsubscribeMarginAvailable()

The method should be implemented if you use the standard order dialog want to show the margin meter.

Once this method is called the broker should stop providing margin available updates.

subscribePipValue()

The method should be implemented if you use a standard order dialog. pipValues is displayed in the Order info and it is used to calculate the Trade Value and risks. If this method is not implemented then pipValue from the symbolInfo is used in the order panel/dialog.

Once this method is called the broker should provide pipValue updates via pipValueUpdate method.

unsubscribePipValue()

The method should be implemented if you use a standard order dialog and implement subscribePipValue.

Once this method is called the broker should stop providing pipValue updates.

See Also