OKX Order Book Channels Checksum Field Deprecation

Published on 21 May 20262 min read

To enhance feed efficiency and stability, OKX is scheduled to deprecate the checksum field across WebSocket order book channels. The deprecation will take effect on the demo environment on 2 June 2026 and on the production environment on 23 June 2026.

The change applies to the books, books-l2-tbt, and books50-l2-tbt channels . After the deprecation date, the checksum field will remain present in push messages but will always return 0 and must no longer be used for data integrity validation. The books5 and bbo-tbt channels do not carry a checksum field and are not affected. This change affects JSON WebSocket channels only; SBE market data feeds are not impacted.

Before the deprecation takes effect, please migrate from checksum to seqId/prevSeqId to verify data continuity and accuracy. OKX WebSocket connections enforce TLS encryption (wss://), which together with rigorous seqId/prevSeqId validation provides equivalent protection against data integrity issues.