17TRACK does not impose a daily limit on the number of shipments that can be registered. However, the API has a rate limit: up to 3 requests per second, with each request carrying a maximum of 40 tracking numbers. Properly managing the API registration rate allows for over 400,000 shipments to be registered per hour.
*Users can set a daily usage limit in the API backend. If the daily registration exceeds this limit, the API will return an error.