# API Rates

Curious to know how we provision API call rates for Creators API ? First, some definitions
* **TPS** – Transactions per second, refers to the maximum number of API calls you can make in one second. Each API call counts as one transaction. For example, if you send 10 ASINs in the request parameter of a GetItems() call, it counts as a single transaction.
* **TPD** – Transactions per day, refers to the maximum number of API calls you can make in one day. If Associate has 1 TPS and 8640 TPD, then maximum of 1 request can be sent per second and 8640 per day. Even if 1 TPS is there, once TPD is exhausted requests will be throttled.
* **Primary Account** – This refers to the Amazon username (email address) and password that you used to create your Associates account and used to generate Creators API  credentials.
* **Shipped revenue** – This refers to the total sales volume of all items Amazon has shipped from orders resulting from clicks through links you created using Creators API .

As soon as you create your Creators API  credentials, you are allowed an initial usage limit up to a maximum of one request per second (one TPS) and a cumulative daily maximum of 8640 requests per day (8640 TPD) for the first 30-day period. This will help you begin your integration with the API, test it out, and start building links and referring products to your readers. 

Your Creators API usage limit will be adjusted based on your shipped item revenue. Your account will earn a usage limit of 
one TPD for every five cents or one TPS (up to a maximum of ten TPS) for every $4320 of shipped item revenue 
generated via the use of Creators API  for shipments in the previous 30-day period (this automatic 
allocation amount is updated daily). For correct attribution of shipped item revenue please ensure that you always call Creators API  with the primary account credentials and retain all the URL parameters that the API returns in its response.

Note that your account will lose access to Creators API  if it has not generated qualified referring sales for a consecutive 30-day period. If you lose access to Creators API , you can continue to use other product linking tools, such as Site Stripe and generate revenue. You will regain access to Creators API  within two days after your referred sales are shipped.

You can check to see sales that have been attributed to Creators API  by navigating to the Link Type Performance report on Associates Central.

It is important you adopt the following best practices to ensure that your referred sales are correctly being attributed to the account used in your Creators API  integration.

* You are using the links provided by Creators API  when linking back to Amazon. Do not edit any of the URL parameters.
* Your Associate account and Creators API account were created using the same Amazon account (i.e. email address).
* You are using your primary account to make requests to Creators API .
* You are passing your Partner tag in all your requests to Creators API . We cannot retroactively apply any sales credit to your account if you forget to do this correctly.

Are you doing all of the above and still observing API throttling? If you are trying to submit requests that exceed your account's usage limit, or if your access has been revoked you will receive a [429 TooManyRequests](en-us/troubleshooting/error-codes-and-messages) error message from Creators API . Please refer our [API integration best practices](en-us/concepts/best-programming-practices) to learn more on how to avoid these situations and optimally access the API.
