Hello JaredB71,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
It is definitely possible to schedule multiple email campaigns to multiple contact lists or segments via API. Below I’m including documentation for our V3 API’s POST (Create) an Email Campaign Activity Schedule request.
Schedule an Email Campaign Activity:
https://developer.constantcontact.com/api_guide/email_campaign_create_schedule.html
POST (Create) an Email Campaign Activity Schedule:
https://developer.constantcontact.com/api_reference/index.html#!/Email_Scheduling/scheduleEmailCampaignActivityUsingPOST
Please have a look and let us know if you have any other questions!
Regards,
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