# Update Preview

## ANTHROPICUSDT Renamed to ANTUSDT

**Effective date:** TBD, subject to further announcement

Starting from the effective date, the following USDT-M Futures trading pair under both the V2 Classic Account and the V3 Unified Account will be renamed:

| **Before** | **After** |
|:-|:-|
| `ANTHROPICUSDT` | `ANTUSDT` |

**What stays the same:**

The following remain unchanged after the rename. There is no need to cancel orders, close positions or place orders again:
- Existing positions remain valid
- Existing open orders, TP/SL orders and strategy orders remain valid
- Trades, fills, positions and history records are not affected

**What changes:**

1. After the rename, API request parameters will accept both `ANTHROPICUSDT` and `ANTUSDT`, so you can keep using the old name or switch to the new one. However, the `symbol` field in all REST responses and WebSocket pushes will be returned as `ANTUSDT`.

| **Scenario** | **Request `symbol`** | **Response `symbol`** |
|:-|:-|:-|
| Before the rename | `ANTHROPICUSDT` | `ANTHROPICUSDT` |
| After the rename, using the old name | `ANTHROPICUSDT` | `ANTUSDT` |
| After the rename, using the new name | `ANTUSDT` | `ANTUSDT` |

2. Public WebSocket connections subscribed with `ANTHROPICUSDT` will receive a push message notifying you of the rename. Please re-subscribe to this trading pair after receiving the message.

:::warning{title="Note"}
We strongly recommend switching the relevant parameters to `ANTUSDT` as soon as possible after the rename takes effect.
:::

## Candlestick and Public Trades Channels: Snapshot Push Removed

**Effective date:** demo trading on November 4, 2026; live trading expected on November 17, 2026

Interface:
- WebSocket candlestick channel (`kline`)
- WebSocket public trades channel (`publicTrade`)

Changes:
- After a successful subscription, these channels will no longer push snapshot data (`action`=`snapshot`); only real-time incremental data (`action`=`update`) will be pushed.
- To obtain historical candlestick or trade data, please use the corresponding REST API.

## books50 Depth Channel: Incremental Push

**Live date:** December 1, 2026

Interface:
- WebSocket `books50` depth channel (JSON)
- WebSocket SBE Depth50 channel (`books50`, templateId=1001)

Changes:
- The `books50` channel will change from full snapshot on every push to incremental push: the first push after subscription is a full `snapshot`, and all subsequent pushes are incremental `update`s. This applies to both the JSON text-frame channel and the SBE binary channel.
- The `pseq` push parameter will also have a value for the `books50` channel (previously only for the `books` channel), and can be used to determine whether there has been packet loss.
- On the SBE side, the schema version will be raised to `5`, and the `Depth50` message (templateId=1001) will carry two additional fields: `depthAction` (`0` = `snapshot`, `1` = `update`) to distinguish the two frame types explicitly, and `pseq` for packet-loss detection.
- Currently effective in **demo trading**.