Validating ad exposure: Media Rating Council (MRC) 50% / 1-second viewability thresholds, browser IntersectionObserver integration, and viewport telemetry.
Advertisers only pay for impressions that have an opportunity to be seen. Modern viewability measurement relies on lightweight, standardized browser APIs.
1. MRC Viewability Standards
Standard Viewability Thresholds
Display Ads: At least 50% of the ad pixels in view for a minimum of 1 continuous second.
Large Display (> 242,500 px): 30% of pixels in view for 1 continuous second.
Video Ads: At least 50% of pixels in view with continuous video playback for ≥ 2 seconds.
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Our team of OpenRTB architects, Prebid.js engineers, and ad fraud analysts audits real-time bidding protocols, MRC viewability metrics, and high-throughput ClickHouse telemetry pipelines.
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