CME Group · Rate Limits
Cme Group Rate Limits
CME Group enforces message-rate governance at the protocol level: per-session MPS caps for iLink order entry, market-data multicast group allocations for MDP 3.0, and platform-wide throttling for the CME DataMine REST surface. Specific numeric ceilings are documented inside the iLink and MDP technical specs distributed to authorized customers.
3 Limits
Throttle: 429
Capital MarketsDerivativesMarket DataRate Limiting
Limits
iLink session — Messages Per Second session
see iLink technical specification
CME Globex enforces a per-session MPS cap on order entry; the cap is allocated per session at onboarding and is documented in the iLink 3 / iLink 2 technical spec.
MDP 3.0 market-data feed subscriber
not throttled — multicast feed
MDP 3.0 is a UDP multicast feed; consumers are expected to keep up with the wire rate. There is no per-consumer throttling.
CME DataMine REST API account
see DataMine API documentation
REST surface for downloading historical / reference data. Throttling is enforced at the platform level.
Policies
iLink MPS allocation
Each iLink session is allocated a Messages-Per-Second cap at onboarding. Exceeding the MPS cap results in messages being rejected with a session-level reject code; sustained over-subscription requires escalation through the customer's clearing firm.
Market-data feed pacing
MDP 3.0 is a real-time multicast feed; consumers must size hardware to keep up with peak message rates. CME publishes capacity guidance for each product group.
Authorized-customer documentation
Detailed message-rate ceilings, retry semantics, and session-level reject codes are documented in the iLink and MDP technical specifications distributed to authorized customers and vendors.