> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mixpanel.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication Methods

Most of our APIs require authentication for which we recommend using [Service Accounts](/reference/service-accounts) to authenticate. However, most of our [Ingestion API](/reference/ingestion-api) calls such as [Import Events](/reference/import-events), [Track Events](/reference/track-event), [User Profiles](/reference/profile-set), and [Group Profiles](/reference/group-set-property) only require a [Project Token](/reference/project-token). Because these APIs are often called from our client-side SDKs, we do not want to expose credentials, but we do need to know which project to send data to so we use the Project Token for that purpose.

<Warning>
  **HTTPS Only**

  Our APIs will reject calls made over HTTP to protect request and response information.
</Warning>