BambooHR is a full suite HCM technology vendor that boasts over 16,000 customers, which translates into roughly 1.5 million employees active on their system.
BambooHR offers a free trial of their HRMS platform, which includes onboarding. BambooHR's solution spans across the employee lifecycle as they also have recruiting and performance management in addition to the core HRMS functionality.
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All you have to do is get started with BambooHR is sign up for the free trial and then get in touch with their team to see which plan is for you.
Most of BambooHRs Customer Success resources are on the self-service side. They have a help center and a CS webinars library, but they do have customer support during business hours.
Bamboo HR has a REST API.
Although it has a free trial, BambooHR doesn't disclose its pricing plans on their website.