Heuritech Trend Data API
The commercial Heuritech data API, sold as part of the Business and Enterprise plans. Heuritech's own product page describes it as "weekly data points on each of our product attributes (prints, colors, fabrics, shapes) with up to 6 year historical data and 2 years forecast" and "full access to Heuritech unique insights" across 1,000+ trends, so a customer can "inject directly Heuritech market data in your own forecasting model". No public developer portal, API reference, base URL, authentication description, OpenAPI/AsyncAPI/GraphQL definition or SDK was found for it on any Heuritech host. Access starts with a sales demo, so the contract is recorded here as sales-gated rather than guessed at.