Real-time Prebid.js auction data captured across 100+ premium publisher sites. See exactly which bidders are winning, which floor prices are clearing, and where ad revenue is being left on the table.
Publisher sites currently monitored
Core Platform
Prebid Monitor uses headless Chromium with residential proxies to capture real auction data at the publisher level, not aggregated or sampled panel estimates.
Live bid data collected every scan cycle using US-based residential proxies. Captures actual Prebid.js auction behavior including bid CPMs, timeouts, win events, and floor interactions as seen by real users on real publisher pages.
Compare CPM, win rate, and bid latency across every demand partner on every publisher you monitor. Non-anonymized data with full site attribution lets you see exactly what each SSP pays on one publisher versus another.
Track which floor price optimization vendors are active across publisher sites, what price models and rules are in use, and how floor configurations affect bid clearance rates and overall programmatic yield.
Daily sellers.json validation and ads.txt cross-referencing to identify unauthorized resellers, missing publisher entries, and path-to-publisher integrity issues that create brand safety risk or lost revenue.
Automatic flagging when auction metrics deviate from established baselines. Anomalies are correlated with Prebid.js configuration changes so you can isolate root cause quickly rather than chasing patterns in raw data.
Roll up performance across entire publisher groups or drill down to a single site, specific device type, or individual bidder. Filter by group, device, and time window to analyze the exact slice of data you need.
The Platform
Real bid data, real publisher sites, updated continuously. Every metric you see is tied to a specific site, bidder, and device type.
Publisher-Level Data
Most header bidding analytics reports give you aggregated benchmarks. Prebid Monitor tells you exactly what Criteo is paying on healthline.com versus menshealth.com, in real time, with full publisher attribution.
Process
We capture actual Prebid.js auction events from real publisher pages, not from aggregated bid streams or panel data. The result is accurate, publisher-specific header bidding intelligence you can act on.
Real browser instances running on US-based residential IP addresses load publisher pages and intercept Prebid.js auction events in real time, capturing data as it looks to an actual user visit -- not a datacenter bot.
Every bid, timeout, and win event is captured with full attribution: bidder name, CPM, bid latency, floor price applied, and whether the bid cleared. Raw Prebid.js auction objects are parsed and normalized at collection time.
Normalized auction data is analyzed for trends, anomalies, and optimization opportunities. The dashboard surfaces publisher-specific recommendations covering demand gaps, dead weight bidders, floor pricing, identity modules, and supply chain issues.
Intelligence Categories
Every publisher in the monitored network receives tailored analysis based on how their Prebid.js configuration and bidder mix compare to the full publisher set.
High-CPM bidders active across comparable publisher sites that are absent from a publisher's Prebid.js configuration.
Prebid.js adapters with no bid activity that add page load latency without contributing any auction revenue.
Floor provider adoption, price model analysis, and clearance rate impact across the monitored publisher network.
Missing Prebid.js identity modules that reduce addressable audience size for premium programmatic buyers.
CPM uplift analysis from adding outstream or in-content video units based on network-wide performance differentials.
CMP and GPP consent signal gaps that reduce bid eligibility in GDPR, CCPA, and other regulated markets.
Demand partners with timeout rates significantly above the network average, causing lost auction opportunities and page speed degradation.
Unauthorized resellers and sellers.json mismatches that expose publishers to brand safety risk and unverified inventory concerns.
Pricing
No per-seat fees, no data usage caps. Full platform access is included at every tier.
Full platform access, billed monthly. Cancel any time.
$2,400 billed annually. Save $600 compared to monthly billing.
Questions? Contact our team.
Who Uses Prebid Monitor
"Finally a tool that shows me what bidders are actually paying on specific publisher sites, not what they claim in their sales pitch. The competitive Prebid.js data alone is worth the subscription."
"We used Prebid Monitor to identify three underperforming bidders that were adding 400ms of latency without ever winning. Removing them immediately improved our page speed scores."
"The supply chain integrity reports caught an unauthorized reseller on two of our tier-one publishers within the first week. That alone paid for a full year of the subscription."
Common Questions
Everything you need to know about how Prebid Monitor collects header bidding data and what you get with a subscription.
Get Started
Full access to every Prebid Monitor feature from day one.