Documentation

Measurement & API Docs

Technical references for the 4D Sight measurement platform — methodology, API endpoints, and real-time event delivery.

Global network diagram with glowing arcs between continents over a data-center backdrop, depicting low-latency webhook delivery.

Jun 1, 2026

Real-Time Webhooks: Delivery, Signing, and Replay Semantics

How to receive sub-second impression events at your endpoint — delivery topology, HMAC signing, idempotency, retry policy, and the replay API for backfills.

Developer workstation with multiple monitors displaying API code and JSON response bodies in a dark editor theme.

API Reference

Jun 1, 2026

Impressions API Reference: Authentication, Endpoints, and Schema

Complete reference for the 4D Sight Impressions API: authentication, the POST /v1/impressions contract, query endpoints, pagination, rate limits, and error semantics.

Broadcast monitor displaying live sports footage with pixel-accurate bounding boxes and viewability percentages around virtual sponsor placements.

Methodology

Jun 1, 2026

Pixel-Level Viewability: The 4D Sight Measurement Methodology

How every virtual placement is measured frame-by-frame — the computer vision pipeline, the viewability formula, and how 4D Sight aligns with IAB and MRC standards.