While you can't create actions in Momence via Zapier, you can create leads via the Momence API.
Note: as Zapier states in the following linked article, to create an API Request action, you’ll need familiarity with sending HTTP requests, APIs, and reading API documentation.
The steps are as follows:
In Zapier, create the logic you'd like to use to collect Lead information
Push the Lead information to the Momence API as shown here: https://help.zapier.com/hc/en-us/articles/12899607716493-Set-up-an-API-Request-action#h_01H95JPYYVQTR2RBF57BV2RSNY
Send the API request to your Leads endpoint that can be seen in your leads collection page, using the token and whatever custom fields you'd like to add. You'll find more information from Marketing > Leads > Collect Leads using API (pictured below).
