# KYT OPEN-API Developer Document

### About V3

**V3 is the fully upgraded 2026 version of the Trustformer KYT OpenAPI.**

Compared with V2, V3 introduces systematic improvements in architecture design, interface standards, and system performance, further enhancing stability, scalability, and enterprise-level integration experience.

#### Key Enhancements in V3

* Simplified authentication (API Key only; no secret key required)
* Optimized Risk Engine architecture and performance
* Standardized response structures and field naming conventions
* Improved API consistency and extensibility
* Clearer version governance and long-term maintenance strategy

V3 retains the core risk control capabilities available in V2 while upgrading the underlying implementation and interface specifications, delivering a more structured, stable, and efficient integration experience.

**We strongly recommend that all new integrations adopt V3.**\
For existing V2 users, migration planning is highly encouraged to ensure continued access to feature updates and long-term technical support.

> **Important Notice:**\
> V2 will be officially deprecated and will no longer be maintained after **December 30, 2026**.