The premium APIs currently consist of two products: 30-day search, and full-archive search.
They have two formats - Sandbox (free), and Premium (paid, and tiered). You can see the differences between the Sandbox and Premium formats on this page for 30-day and this page for full-archive - essentially, in the Sandbox you have a smaller number of requests per month, less complex operators, and you do not have access to the counts endpoint; in the paid tiers, you can pay per month to upgrade the number of requests you are able to make. Click the “Select” pill button in the right-hand column for Premium to see the pricing for each of the products.
For enterprise, we have a wider range of APIs available beyond those two search APIs, including (for example) streaming PowerTrack, historical PowerTrack, and the Engagement API. Pricing can be discussed with our team based on your needs.
In all cases, we need to evaluate your use cases carefully, so when you fill out the forms to apply for premium or request a discussion on enterprise, it is very important that you clearly describe what you intentions are for the use of the APIs, and to be specific about which products you’re requesting access to.
We apologise that we are not able to respond to every access request via these forums - that’s what the application process is for. The premium APIs are still in beta and we are continuing to onboard developers on a gradual basis. Thank you for your patience.