API calls are operations performed when another service communicates with ours. For example, if you use Zapier, each time the two apps in a zap are synced, a certain number of API calls is needed. The syncing interval is either 5 or 15 minutes.
On the free 123FormBuilder plan (Basic), you can use up to 100 API calls per day. On the paid plans, however, the number of API calls that you can use is unlimited. If you want to use more than 100 API calls per day, upgrade your account or contact us for custom requests.
The number of API Calls/day can be checked in the My account – API Keys section.