OpenGamma incident
CME CORE Margin API issues impacting cross margin optimisation services
Resolved after 3 hours 10 minutes, affecting CME, on August 12, 2026.
Status: We have confirmed that the underlying issue is now resolved. This incident is now closed. Cause: This was a CME outage which appeared driven by recent maintenance work on their side.
Affected components
Update timeline
- investigating Aug 12, 2026, 07:49 AM UTC
Status: We have identified an issue with the CME CORE Margin API and we are urgently working on identifying the root cause. We will keep this page updated. Problem/Impact: We query the CME CORE Margin API directly for our cross margin optimisation, used across What If Trades, Rebalance, and CME optimisation reporting. We are receiving back bad requests, resulting in no cross margin optimisation at this time.
- investigating Aug 12, 2026, 08:53 AM UTC
Status: We have identified an issue with the CME CORE Margin API and we are urgently working on identifying the root cause. We will keep this page updated. Problem/Impact: We query the CME CORE Margin API directly for our cross margin optimisation, used across What If Trades, Rebalance, and CME optimisation reporting. We are receiving back bad requests, resulting in no cross margin optimisation at this time. Update: CME have published a circular confirming they are aware of an outage impacting their CME CORE API service and they are investigating.
- resolved Aug 12, 2026, 11:00 AM UTC
Status: We have confirmed that the underlying issue is now resolved. This incident is now closed. Cause: This was a CME outage which appeared driven by recent maintenance work on their side.
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