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The Calcs.com API reference has a home of its own. Every endpoint, schema, parameter, and example is documented on the Calcs.com developer portal.

Go to developer.calcs.com

Projects, sheets, calculators, and site design data, with request and response schemas.

The essentials

Base URL:
Authentication, on every request:

What is documented there

Getting access

The API is the interface behind CalcsConnect, and access is granted case by case. Start with getting API access to CalcsConnect, or book an integration call.
The Solutions API documented under /api-reference/endpoint/ is a different interface, at a different address, with its own authentication. New integrations should build against developer.calcs.com.