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SBE Basic Information

MMWS / Gateway only

All SBE-based feeds and Fast Order channels described in this section are available only via the Market Maker WebSocket (MMWS) / Market Maker Gateway (GW) infrastructure.

For access and architecture details, see the official announcement: Market Maker Gateway

This page gives a unified introduction to Bybit's SBE-based market data and Fast Order channels and how they fit into the MMWS/GW environment. Detailed, feature-specific behavior and code examples are provided in the sub-pages for:

  • BBO SBE (Level 1, with RPI fields)
  • Level-50 SBE (50-level order book snapshots + deltas)
  • Fast Order SBE (ultra-low-latency order acknowledgements)

What is SBE?​

Bybit uses Simple Binary Encoding (SBE) in accordance with the FIX/SBE 1.0 specification:

  • Binary, little-endian encoding
  • Fixed-width fields where possible
  • Explicit message header + message body layout
  • High-efficiency decoding suitable for HFT and MM strategies

Compared with JSON WebSocket feeds, SBE provides:

  • Smaller payloads (up to ~30–50% reduction vs equivalent JSON data)
  • Deterministic binary layouts
  • Microsecond timestamp precision
  • Lower CPU usage for both encoding and decoding