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Notifies consumer about changes in history deals.

For more information see AsyncApi documentation


This event is emitted by MetaApi upon initial terminal state synchronization

The message below can be received from the synchronization event.

Name Type Required Description
type string Yes The value of this field will be deals
synchronizationId string Yes Id of the synchronization request
deals array Yes History deals. Payload schema: Array<MetatraderDeal>
accountId string Yes account id specified in the request
sequenceNumber number Yes an ordinal number of the packet. Increases by 1 with each new packet. Starts with 0 in every new session. Can be used to check for packet loss during synchronization.
sequenceTimestamp number Yes an ordinal number of packets, but this field is increased by a random number in each new packet. Always increases regardless of the session.

Code example:

import ioClient from '';

const socket = ioClient('', {
    path: '/ws',
    reconnection: false,
    query: {
        'auth-token': 'token'

const request = {
  accountId: '865d3a4d-3803-486d-bdf3-a85679d9fad2',
  type: 'synchronize',
  requestId: '57bfbc9f-108d-4131-a300-5f7d9e69c11b',
  startingDealTime: '2019-01-13T10:29:26.000Z',
  startingHistoryOrderTime: '2019-01-13T10:29:26.000Z'

socket.on('connect', () => {
  socket.emit('request', request);

socket.on('synchronization', data => {
  if (data.type === 'authenticated') {
    request.requestId = uuid.v4();
    socket.emit('request', request);

socket.on('processingError', err => {

An example of a synchronization payload:

  "type": "deals",
  "synchronizationId": "57bfbc9f-108d-4131-a300-5f7d9e69c11b",
  "deals": [
      "id": "27836211",
      "type": "DEAL_TYPE_BUY",
      "symbol": "AUDUSD",
      "magic": 1000,
      "time": "2020-02-27T09:53:12.042Z",
      "brokerTime": "2020-02-27 12:53:12.042",
      "entryType": "DEAL_ENTRY_IN",
      "volume": 0.04,
      "price": 0.65712,
      "commission": -0.14,
      "swap": 0,
      "profit": 0,
      "positionId": "38894739",
      "orderId": "38894739",
      "platform": "mt5",
      "clientId": "SH_52150619_iODm2q5aiH"
  "accountId": "865d3a4d-3803-486d-bdf3-a85679d9fad2"