VIPs · OKX Order Book Channels Checksum Field Deprecation

OKX plans to remove the checksum field from its WebSocket order book channels to improve feed efficiency and stability.

The change takes effect on the demo environment on 2 June 2026 and on the production environment on 23 June 2026.

It affects the books, books-l2-tbt and books50-l2-tbt channels; books5 and bbo-tbt have no checksum and are not affected, and SBE market data feeds are not impacted.

Before the deadline, developers should switch to seqId/prevSeqId to check data continuity and accuracy, and should stop using checksum for data validation since it will always return 0.