BULK Mainnet Upgrade - Sunday, 18 October We’re preparing the next BULK mainnet upgrade. Bringing improvements to matching, conditional orders, risk calculations and recovery, alongside the infrastructure for BIP-1 markets. Maintenance schedule - UTC - 12:00–13:00: Planned maintenance. Trading will pause, and API/WebSocket connections will be interrupted. - 13:00–13:30: Controlled reopening. Markets will initially accept post-only orders and orders that reduce existing positions. - 13:30: Target time for unrestricted trading to resume, following final validation. We’ll share progress during maintenance and confirm when normal trading is available. Order handling: The planned startup cleanup will cancel ALO/post-only orders. What’s changing: - Matching and collateral budgeting: Improved handling of position reductions and available collateral during execution. - Conditional-order processing: More consistent routing of generated actions through the normal execution and delay queues, with improved persistence across recovery. - Risk, liquidation and ADL: Updates to portfolio-risk calculations, recovery accounting and isolated-account handling. - BIP-1 foundations: Support for provider-backed market configuration, provider-fee accounting and related queries. Happy trading!