ISAPI is Hikvision's proprietary HTTP-based API for their cameras and recorders — their vendor SDK path beyond ONVIF, broadly analogous to what VAPIX is for Axis. It exposes the device's full configuration and capability surface over RESTful HTTP: streaming and imaging parameters, event and alarm handling, PTZ, on-board analytics configuration, storage and device management, and features that the ONVIF profiles do not cover. Several other manufacturers have adopted ISAPI-style interfaces, so it is widely encountered.
Like any vendor API, ISAPI is what an integration reaches for when the open standard runs out. A VMS uses ONVIF for cross-brand discovery, streaming, and standard events, then drops to ISAPI to configure a Hikvision camera's specific analytics, pull proprietary event details, or manage the device at a depth ONVIF does not standardise. It is the practical "full features" layer above the ONVIF baseline for that ecosystem.
The pitfalls are two. First, the usual lock-in: ISAPI integration ties that part of the system to Hikvision-style devices and adds a proprietary surface to maintain. Second, and specific to this vendor, procurement and security policy: Hikvision (and Dahua) equipment is restricted under the US NDAA Section 889 and similar rules in several jurisdictions, so an ISAPI-dependent design can collide with compliance requirements before any technical issue. Weigh both the coupling and the regulatory exposure, not just the feature gain.
The handbook · 7 volumes
Fora Soft Video Engineering Handbook
ISAPI exposes Hikvision features that ONVIF does not, and every direct ISAPI call ties your VMS to one vendor. We wrote seven volumes covering the full video stack, and for ISAPI integrations start with Volume 6: deployment topologies, detection and tracking that use the device events ISAPI returns. Volume 1 covers the codecs those cameras stream. Written by Nikolay Sapunov, CEO at Fora Soft.
Integrating Hikvision devices through ISAPI without locking your VMS to one vendor?
Tell us which Hikvision features you need, and we will scope an ISAPI integration behind an abstraction layer so other brands can plug in later. 250+ video products shipped since 2005.
