Change Log

This page records updates to the OpenAPI documentation.

2026-10-27

Get Kline — missing candles fix and query parameter correction

Fixed a history query issue on Get Kline (GET /api/v1/futures/market/kline) where candles could be skipped in the result, and corrected the documented request parameters.

• History klines are now filled from the first missing candle in the query window, so mid-range candles are no longer dropped
• startTime is not supported and has been removed from the request parameters
• Query is endTime + limit counting backward; the candle whose open time equals endTime is not included
• Best practice: set endTime to an interval-aligned candle open time

2026-10-15

Get Kline — MARK_PRICE type fix

Fixed an issue in Get Kline (GET /api/v1/futures/market/kline) where the type=MARK_PRICE request parameter did not take effect.

• The type parameter now correctly returns mark price kline data when set to MARK_PRICE
• Supported values remain LAST_PRICE and MARK_PRICE; default is LAST_PRICE

2026-10-08

Get Kline

Documented the time field on Get Kline (GET /api/v1/futures/market/kline).

• time is the candle open time in Unix milliseconds, not the close time
• The response contains only closed candles and does not include the candle that is still forming

2026-06-15

WebSocket Connection Limits

Added WebSocket connection rate limit documentation under WebSocket Preparing for Access.

• The WebSocket server accepts a maximum of 5 messages per second
• Messages include PING frames, PONG frames, and JSON-formatted messages (such as subscribe and unsubscribe requests)
• If the message rate exceeds this limit, the connection will be disconnected
• IPs that are repeatedly disconnected may be blocked by the server