Open Source · UK-Native · Powered by Covatic Sense

The DSP
the market didn't
want you to have.

OpenBook is the UK's first open-source, free-to-use demand-side platform. Person-level CTV targeting. Seven AI campaign agents. Complete fee transparency. No platform tax. No black box.

Start a free campaign See how it works →
Live auction pipeline — OpenBook bidder — Sky AdSmart CTV
T+0ms Bid request received from Magnite / Sky AdSmart —
T+6ms TCF 2.2 consent validated · GPC signal checked —
T+12ms Covatic HouseholdID resolved · EUID matched —
T+16ms DoubleVerify pre-bid brand safety · HUMAN IVT check —
T+22ms Audience segment matching · frequency cap check —
T+38ms Smart Campaign scoring · CPM model · bid shading —
T+44ms Bid response dispatched to SSP —
0 Bid decision time
0 External connectors
0 Platform features
£0 Platform fee on media spend
The problem

Programmatic advertising
is broken by design.

The platforms that sit between advertisers and publishers were built to extract value, not deliver it. OpenBook is built to fix that.

01 / OPACITY
No one can see where the money goes.
The average programmatic campaign sees 40–60% of media spend disappear before it reaches a publisher. DSP fees, SSP fees, exchange fees, data fees, measurement fees — stacked invisibly. The advertiser sees a CPM. They never see the breakdown.
→ OpenBook logs every fee on every impression. Forever.
02 / IDENTITY
Everyone is guessing who is watching.
The Trade Desk doesn't know who is watching your CTV ad. It has probabilistic models, device graphs, statistical inferences. It charges a premium for this educated guesswork — and calls it addressability. It isn't. Confirmed identity requires a confirmed first-party signal. Most DSPs don't have one.
→ OpenBook has Covatic Sense. It's not a model. It's a fact.
03 / ECONOMICS
The platform tax is the product.
The Trade Desk charges a percentage of every pound you spend — whether it performs or not. The more you spend, the more they earn. This is a structural conflict of interest baked into the business model of every major DSP. The platform that charges you the most has the least incentive to help you spend less to achieve the same result.
→ OpenBook charges only for what makes it better: Covatic Sense activation.
How it works

A bid decision in 68 milliseconds.

Seven pipeline stages. Every one of them visible, auditable, and documented. This is what happens inside OpenBook between a user loading a page and your ad appearing.

T+0ms
Bid request received
OpenRTB 2.6 request arrives from SSP with identity signals, content context, floor price, and supply chain object. Sellers.json validation confirms direct publisher path.
Magnite / PubMatic / Sky AdSmart
T+4ms
Consent validation
TCF 2.2 TC string decoded. All four required purposes validated. GPC signal checked. Missing consent returns no-bid immediately — no exceptions, no workarounds.
IAB TCF 2.2 · OneTrust · GPC
T+8ms
Identity resolution
EUID decryption, Covatic HouseholdID graph lookup, LiveRamp RampID match — all in parallel Go goroutines. Identity tier confirmed: Person-Level, Household, Device, or Probabilistic. Higher tier = higher bid value.
EUID · Covatic Sense · LiveRamp
T+16ms
Brand safety & fraud prevention
DoubleVerify pre-bid classification (real-time for CTV). HUMAN Security IVT check. Any unsafe impression returns no-bid. The result is logged to the Transparency Dashboard regardless of outcome.
DoubleVerify · HUMAN Security
T+22ms
Audience matching
Redis segment store lookup by HouseholdID. Returns all matching campaign audience segments, suppression list status, frequency cap remaining, and IAS/Peer39 contextual scores.
Redis · Covatic Audience Engine
T+32ms
Bid scoring & price calculation
Smart Campaign conversion probability model runs against household profile. Value-based bid calculated. Bid shading applied for first-price auctions. Competitive separation checked. Clearcast clearance number verified for broadcaster inventory.
Smart Campaign Engine · Clearcast
T+44ms
Bid response dispatched
OpenRTB 2.6 response constructed and sent. Win/loss logged to ClickHouse regardless of outcome. Every bid — won or lost — is a data point in the Transparency Dashboard.
SSP · ClickHouse audit log
Total pipeline time
68ms
From request receipt to response. Every stage logged. Every decision explainable. No black box.
Covatic Sense

The only DSP that actually knows who is watching.

Every other DSP models audience identity. OpenBook confirms it. Covatic Sense is an on-device SDK deployed across UK publishers that generates privacy-safe, first-party household and person-level signals — no cookies, no probabilistic guesswork.

Person-Level
EUID + Covatic HouseholdID confirmed. Deterministic identity. The highest-confidence signal available on the open web.
SENSE
Household
HouseholdID confirmed. Postcode-anchored. Full household profile including Mosaic type, tenure, composition.
SENSE
Device
Device-level identification. Standard programmatic targeting. No household enrichment.
STANDARD
Probabilistic
Statistical inference only. Available as a fallback. Labelled clearly in all reports and the UI — never passed off as something it isn't.
INFERRED
12M
UK households reachable via Covatic SDK publishers — Sky, Bauer, Octave, Global, BBC
74%
of addressable UK homeowner reach delivered at Person-Level tier — vs 0% on any other DSP
£0
extra cost to use Covatic Sense above the flat £0.50 CPM activation fee — no data licence, no minimum spend
100%
on-device signal generation — user data never leaves their device, GDPR-compliant by architecture not by policy
AI-powered campaign agents

Seven agents. One campaign.
Almost no manual work.

OpenBook's Claude-powered agents manage the full campaign lifecycle. Brief intake to post-campaign report. They ask for human approval exactly four times. The other 843 decisions happen while you sleep.

📋
Briefing Agent
Brief → Campaign Spec
Reads PDFs, emails, or plain-English briefs and builds a complete campaign specification — audience, channels, budget split, timeline. One upload, one conversation, campaign ready to launch.
🎯
Audience Agent
Segment Intelligence
Sizes audiences using Covatic Sense data, identifies the optimal segment mix, detects segment health issues mid-campaign, and proposes lookalike expansions before reach shortfalls happen.
💰
Buying Agent
Channel Strategy & Deals
Models channel splits, identifies PMP deal opportunities, adjusts bids based on pacing and auction dynamics, and applies daypart modifiers when hourly CPA data supports it.
⚡
Optimisation Agent
Live Performance
Runs at 02:00 every night. Scans every live campaign for pacing drift, CPA trends, win rate anomalies, and floor price changes. Fixes what it can autonomously. Escalates what it can't.
🎨
Creative Agent
Compliance & Quality
Validates creative assets, submits to Clearcast for UK broadcaster inventory, runs CAP/BCAP pre-screening, applies AI moderation, and monitors clearance status — automatically.
📊
Reporting Agent
Intelligence & Insight
Generates weekly summaries and post-campaign decks from Nielsen, DoubleVerify, AudienceProject, and attribution data — within 2 hours of campaign end, unprompted.
🛡️
Compliance Agent
UK GDPR & Governance
Runs pre-launch compliance certification, monitors TCF consent coverage in-flight, manages data lifecycle post-campaign, and maintains the RoPA — automatically updated on every campaign event.
Radical transparency

Every penny.
Every path.
Every impression.

OpenBook's Transparency Dashboard shows the complete fee stack on every won impression — your platform fee, the SSP's margin, the exchange fee, and the net CPM the publisher actually received. No walled garden. No aggregated totals to hide behind.

🔍
Bid-level log
10,000 rows of raw bid-level data per campaign. Searchable, filterable, exportable. Every bid you placed — won or lost — with full context.
🛤️
Supply path scoring
Every SSP connection is scored for path directness, fee transparency, and duplicate impression rate. OpenBook automatically weights spending toward the most direct, highest-value paths.
📐
Auction mechanics visible
First-price vs second-price auction type, bid shading savings, floor price compliance, and clearing price distribution — all logged and graphed.
Example fee stack — £10.00 CPM won impression
Advertiser pays £10.00 CPM
OpenBook platform fee £0.00
Covatic Sense activation £0.50
SSP fee (Magnite) £0.85
DV verification fee £0.12
Publisher receives £8.53
Working media rate 85.3% ↑

vs industry average: 40–60% working media. Every number above is visible on every impression in your Transparency Dashboard.

Open source

Built in public.
Owned by everyone.
Beholden to no one.

OpenBook is MIT-licensed and open source from day one. The bidder, the campaign manager, the agent suite, the Prebid adapters — all of it. Not open-core. Not open-with-a-paywall. Open.

Because the only way to prove that a DSP has nothing to hide is to show everyone the code.

View on GitHub
Pricing

Honest pricing.
No platform tax.

You pay for what makes OpenBook better than a standard DSP. Nothing else.

Self-Serve
£0
Full platform access. All channels. All AI agents. All reporting. No media spend percentage.
  • Full OpenRTB bidder — all SSP connections
  • All 7 AI campaign agents
  • CTV, audio, display, DOOH
  • DoubleVerify + IAS brand safety
  • Nielsen DAR + AudienceProject measurement
  • Mediaocean Prisma integration
  • Transparency Dashboard
  • UK GDPR compliance suite
+ Covatic Sense
£0.50 / 1k Sense impressions
Everything in Self-Serve, plus person-level and household-level targeting powered by Covatic's on-device SDK data.
  • Everything in Self-Serve
  • Person-Level identity tier
  • Covatic HouseholdID graph access
  • 12M+ UK households addressable
  • Cross-channel frequency capping at person level
  • Experian Mosaic household enrichment
  • Sky AdSmart HH-ID fusion
  • Deterministic attribution
Enterprise
Let's talk
White-label deployment, custom SLAs, dedicated infrastructure, broadcaster partnerships, and ARTF container deployment.
  • Everything in Covatic Sense tier
  • White-label deployment options
  • Dedicated engineering support
  • Custom SSP and publisher integrations
  • ARTF bidder container deployment
  • Sky AdSmart & Bauer direct API
  • Custom data clean room setup
  • Board-level reporting & SLA
Who it's for

Built for the people
who actually buy media.

The Agency Trader
GroupM · Publicis · Omnicom · IPG
You run 40 campaigns at once. You know what SPO means. You've spent years fighting for transparency your DSP won't give you. OpenBook gives you the controls, the data, and the Mediaocean Prisma integration your finance team has been asking for.
  • Full-featured trading UI with 15-column campaign table
  • Bulk bid management and keyboard navigation
  • Prisma integration — auto IO, delivery push, invoice matching
  • DV + IAS pre-bid configurable per advertiser
  • Log-level Transparency Dashboard
  • Agentic deal negotiation with UK publisher AI
The Brand Marketer
Marketing Director · CMO · In-house team
You don't want a trading desk. You want campaigns that work, reports you can understand, and a platform that isn't trying to upsell you at every step. The Brand UI is built for you — plain English, five steps, launch in 30 minutes.
  • Natural language campaign setup — describe your goal
  • AI recommends audience, channels, and budget split
  • Plain-English health summaries (no jargon)
  • One-click brand safety and verification
  • Post-campaign deck generated automatically
  • No minimum spend, no long-term commitment
The Developer
Ad Tech Engineer · Platform Builder · Integrator
You want the source code, the OpenAPI spec, and a real Go bidder you can read and understand. OpenBook is built to be extended — Prebid adapters, custom SSP connections, ARTF container deployment. Fork it. Break it. Make it yours.
  • MIT-licensed Go bidder with full OpenRTB 2.6 implementation
  • OpenAPI 3.1 spec for all platform APIs
  • Published Prebid.js and Prebid Server adapters
  • ARTF-compliant container packaging (Phase 2)
  • Plugin interface for custom SSP and data connectors
  • Docker deployment on any cloud, any region
For publishers

The only DSP with a
publisher portal.

OpenBook's Publisher Deal Portal lets UK broadcasters, audio publishers, and digital media owners create and manage programmatic deals directly — with full visibility into buyer quality, identity tier composition, and deal performance.

Apply for publisher access →
  • Create and distribute PMP and PG deals directly — no SSP intermediary required for Covatic SDK publishers.
  • See the identity tier composition of every deal — what percentage of buyers are reaching your audience at Person-Level, Household, or Device.
  • Agentic deal negotiation — OpenBook's Buying Agent can accept, counter, or escalate PG deal proposals from your ad ops team automatically.
  • ARTF container deployment for Phase 3 publishers — co-locate the OpenBook bidder in your infrastructure for sub-20ms latency and maximum addressability.
  • Real-time buyer activity dashboard — see which advertisers are bidding on your inventory, at what CPM, and how your SPO score compares across demand sources.

The platform is free.
The advantage is real.

Start a campaign in 30 minutes. No contract. No minimum spend. No platform fee on media.

Start for free Book a demo View on GitHub