The FIX 4.2 Order Entry API rate limits are:
50
requests per rolling second1 per session100
messages per second in burstsRolling second
The clock starts when the first command is sent. We use a lazy-fill token bucket implementation.
The FIX 5 Order Entry API rate limits are:
2
logons per second per API key100
requests per secondYour FIX 5 session is disconnected if your messages exceed 200
messages per second
75
. See FIX Best Practices.175
1
100
15
The FIX Market Data API is limited to 1
connection per API key. It does not use FIX order entry rate limits (connections, rps, burst rps).