Web APIs are the modern integration glue for seamless data connections with Act!, and provide the foundation for automating workflows to hundreds of applications through integration platforms. Act! Web APIs are JSON-based REST APIs, which are simple, and easy to use.  Our Web APIs also support open standards like OData for powerful querying. Our Web APIs are almost identical across products, making it easy to build integrations across the portfolio.
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Act! Premium Web API

Sign up for a free trial of Act! Premium, then read the Act! Premium Web API reference documentation

Act! Premium also has a .NET native SDK, for UI integrations and native customisations. 

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Act! 365 Web API

Sign up for a free trial of Act! 365, then read the Act! 365 Web API reference documentation.

The Act! 365 Web API also supports a SAML-based Single-Sign On (SSO), for external provisioning, authentication, and billing of customers at scale. If you are interested in being an Act! 365 distributor, please contact us