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ritmex-bot/docs/binance/binance-spot/websocket-api_event-format.md
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---
title: "Event format | Binance Open Platform"
source: "https://developers.binance.com/docs/binance-spot-api-docs/websocket-api/event-format"
fetched_at: "2026-02-26T10:38:12.736Z"
---
[User Data Stream](https://developers.binance.com/docs/binance-spot-api-docs/user-data-stream) events for non-SBE sessions are sent as JSON in **text frames**, one event per frame.
Events in [SBE sessions](https://developers.binance.com/docs/binance-spot-api-docs/faqs/sbe_faq) will be sent as **binary frames**.
Please refer to [`userDataStream.subscribe`](https://developers.binance.com/docs/binance-spot-api-docs/websocket-api/user-data-stream-requests) for details on how to subscribe to User Data Stream in WebSocket API.
Example of an event:
```
{ "subscriptionId": 0, "event": { "e": "outboundAccountPosition", "E": 1728972148778, "u": 1728972148778, "B": [ { "a": "BTC", "f": "11818.00000000", "l": "182.00000000" }, { "a": "USDT", "f": "10580.00000000", "l": "70.00000000" } ] }}
```
Event fields:
Name
Type
Mandatory
Description
`event`
OBJECT
YES
Event payload. See [User Data Streams](https://developers.binance.com/docs/binance-spot-api-docs/user-data-stream)
`subscriptionId`
INT
NO
Identifies which subscription the event is coming from. See [User Data Stream subscriptions](https://developers.binance.com/docs/binance-spot-api-docs/websocket-api/event-format)