Sandbox API key


Availability: Enterprise plan

We don't charge for making API calls with the Sandbox key. Developers can use the Sandbox key to evaluate our API.


  • API calls with the Sandbox key are limited to 10 requests per minute, per endpoint.
  • Generated PDFs have watermarks, and created documents have the "[DEV]" prefix by default.
  • During the free trial period, you can only send documents if the sender and recipient email addresses are from the same organisation (email domain).