IEX has a fair use transactions limit for its subscriptions and the number of customers, products and orders that can be transmitted on a monthly basis. This is due to operational reasons and to ensure stability.
The Fair use limit for IEX Shared that is Basic, Standard, Premium and Enterprise is 5.000 transactions per day maximum 60.000 per month. IEX Dedicated Fair use limit is 10.000 transactions per day maximum 120.000 per month.
IEX may at any time make a subscription upgrade by exceeding the Fair Use limit. IEX will typically contact you. In case of significant overuse of transactions, IEX may suspend at any time until a solution has been found for overuse, or terminate a subscription.