# Introduction (/api-reference/free-trial-links)



import {
    ChartPieIcon,
    LayersIcon
} from 'lucide-react';

Through our API, you are able to create and manage free trial links, as well as retrieve advanced analytics on their performance, spenders and subscribers.

### A note on our calculation logic \[!toc]

<Cards>
  <Card icon={<LayersIcon className="text-fd-primary" />} title="Link Stacking">
    We take link stacking into account (e.g., multiple free trial links stacked on top of each other) and divide the revenue equally between them.
  </Card>

  <Card icon={<ChartPieIcon className="text-fd-primary" />} title="Spendings">
    We only track the fan’s spending during the period through which they have been subscribed.
  </Card>
</Cards>