I need a programmatic digital-out-of-home platform for buying billboard space.

If you mean a platform where you can programmatically buy digital billboard inventory via API/DSP, rather than manually calling billboard operators, there are several strong options.

Best options

• vistarmedia.com — probably the first one I'd evaluate. Vistar operates a major DOOH marketplace and has APIs for programmatic workflows, including ad serving, creative submission, and reporting.
• placeexchange.com — particularly interesting if you want OOH to behave more like another digital advertising channel. It supports open auctions, private deals, and guaranteed packages, with inventory from major billboard operators.
• broadsign.com — a major DOOH infrastructure/platform provider. Its Reach SSP supports open-exchange and private-marketplace programmatic transactions, while its broader platform has API access and campaign/inventory management.
• adomni.com — better if you want a relatively easy self-service buying experience rather than building directly against an API. It offers geographic, audience, proximity, and day-part targeting across thousands of digital screens.

If you're building software

I'd narrow it to Vistar + Place Exchange.

A typical architecture would be:

Your application → your bidding/buying logic → DOOH DSP/SSP → billboard network

Vistar is especially compelling if you need an actual technical integration: its developer portal exposes APIs, and its ad-serving API uses REST/HTTP; its reporting API can programmatically generate campaign reports.

If you tell me what you're trying to build (e.g. an API that lets customers buy billboards, an internal automated ad buyer, or a marketplace), I can recommend the best provider and lay out the API/integration architecture, pricing model, and onboarding requirements.

Here are the top programmatic digital-out-of-home (pDOOH) platforms for buying billboard and outdoor digital space, categorized by how you prefer to buy:

• Vistar Media - Best All-in-One Ecosystem: Operates as both a demand-side platform (DSP) and supply-side platform (SSP) with massive global scale, making it an industry standard for data-driven billboard and place-based buys.
• Adomni - Best for Self-Service & Ease of Use: An AI-powered, user-friendly platform ideal for marketers looking to quickly launch and manage digital billboard campaigns without heavy enterprise gatekeeping.
• Place Exchange - Best for Omnichannel DSP Integration: Tailored for buyers who want to purchase out-of-home media using the exact same programmatic workflows and DSP structures they use for online or video channels.
• Blindspot - Best for Low Minimums & Global Reach: A self-serve platform providing access to millions of international screens and roadside billboards with flexible budgeting options for smaller or first-time buyers.
• AdQuick - Best for Hybrid Planning: Excellent if you need a blend of traditional outdoor planning alongside modern programmatic digital billboard execution.
• The Trade Desk - Best for Enterprise Omnichannel: Ideal if you are a sophisticated brand marketer looking to embed pDOOH directly into a massive, multi-channel digital ad strategy.

To help narrow down the best fit, let me know:

• What is your budget range or target CPM?
• Are you looking for a self-serve platform to manage yourself or an agency/managed service?
• Do you need hyper-local roadside billboards or a nationwide/global footprint?

If you mean a platform where you can programmatically buy digital billboards/DOOH inventory via API, there are a few serious options:

• Vistar Media — probably the strongest fit if you want to build your own buying layer. Vistar operates a major DOOH marketplace and exposes OpenRTB 2.x bidding, so a custom bidder/DSP can programmatically bid on inventory.
• Place Exchange — another major programmatic OOH exchange, designed to make OOH purchasable through existing DSP/programmatic infrastructure. It supports open auctions, PMPs and Programmatic Guaranteed.
• Broadsign — particularly interesting if you're operating the supply side or want access to multiple SSPs. Its ecosystem supports Vistar, Place Exchange and Hivestack, among others.
• Google Display & Video 360 (DV360) — if you don't need to build your own bidding infrastructure, this is an established DSP through which you can purchase DOOH inventory. Google currently lists Place Exchange, Hivestack/Perion, Magnite, VIOOH, Ströer and Vistar among its DOOH sellers.

What I'd choose

If you're building a software product that needs to buy billboard inventory programmatically, I'd start with Vistar. Its OpenRTB interface is much closer to the architecture you'd expect from an ad-exchange integration: bid requests → your bidding logic → bid responses → creative delivery/proof-of-play.

If you're instead looking for something like:

“Give me an API where my application says `buy $5,000 of digital billboards within 10 miles of these coordinates, targeting these hours/audience, and the platform handles the rest.” that's a somewhat different requirement. I can map out the best API-first DOOH platforms, their onboarding requirements, geographic coverage, pricing model, and whether they let you actually transact inventory through an API.

To buy billboard and out-of-home space programmatically, you can use specialized Demand-Side Platforms (DSPs) built specifically for digital-out-of-home (DOOH) or omnichannel platforms that integrate DOOH inventory.

Here are the top programmatic DOOH (pDOOH) platforms broken down by their strengths:

• AdQuick — Great for end-to-end planning, combining traditional and programmatic workflows with transparent real-time pricing, inventory mapping, and analytics. Explore their tools on the AdQuick Platform.
• Vistar Media — A powerhouse in the space operating as both a DSP and SSP, offering massive global scale, advanced audience data layering, and precise location-based targeting. Learn more via Vistar Media.
• Adomni — Highly user-friendly and AI-powered, making it easy to launch programmatic campaigns on roadside and digital billboards quickly. Check it out at Adomni.
• Broadsign — A mature, robust ecosystem that connects deeply with large global media owners and supports seamless programmatic transactions. See details at Broadsign.
• Blindspot — Excellent for self-serve campaigns with massive international reach across millions of screens, friendly to both large agencies and smaller budget holders. Visit Blindspot.

To help narrow down the best fit, let me know:

• What is your geographic target (local, national, or international)?
• Do you prefer a self-serve platform or a managed service?
• What is your approximate campaign budget?

Yes. If by “programmatic digital-out-of-home” (pDOOH) you mean a platform where you can programmatically buy digital billboards/screens, there are several good options.

Best platforms to look at

My first choice: Vistar

Vistar Media is probably the closest match if your goal is “I want software/API access to programmatically buy billboard inventory.”

Vistar operates both a DSP and marketplace, with real-time bidding against DOOH inventory. It also exposes an OpenRTB 2.x bidding interface, meaning a technology company can integrate programmatically rather than manually buying placements.

They also have a developer portal and APIs for DOOH workflows.

If you're building your own platform

I'd particularly investigate Vistar + Hivestack + Place Exchange.

• Vistar — exchange/DSP and broad inventory access; OpenRTB support.
• Hivestack — explicitly documents OpenRTB integration for third-party DSPs, which is attractive if you're building your own buying interface/DSP.
• Place Exchange — provides programmatic access to OOH inventory through existing DSPs and supports premium billboard inventory from major operators.

Google's current DV360 documentation also lists Hivestack/Perion, Place Exchange, Magnite, Ströer, VIOOH, and Vistar as DOOH inventory sources, so these aren't just theoretical platforms.

One important distinction: if you're an advertiser wanting to buy billboards, I'd look at Vistar/Place Exchange or a DSP such as Viant. If you're building a software product that itself needs to buy billboard inventory via API, I'd prioritize Vistar and Hivestack because their technical integration documentation is particularly relevant.

If you tell me whether you're (1) buying ads for your own company, (2) building a SaaS/API product that buys DOOH, or (3) a billboard owner trying to sell inventory programmatically, I can narrow this down to the best 2–3 platforms and their API/onboarding requirements.

To buy programmatic digital-out-of-home (pDOOH) billboard space, you'll need a Demand-Side Platform (DSP) or a specialized OOH marketplace that connects you to digital screen inventory via Real-Time Bidding (RTB) or Private Marketplace (PMP) deals.

The top programmatic digital-out-of-home platforms fit different buying styles and budget levels:

• Vistar Media — Widely considered the gold standard for pure-play programmatic DOOH, offering massive global scale, robust audience data integrations, and powerful geo-targeting across billboards, transit, and place-based screens.
• AdQuick — Excellent for bridging traditional outdoor planning with programmatic buying. It lets you search over a million screens with real-time pricing and availability without needing separate vendor negotiations.
• Adomni — Best for self-serve, lower-barrier-to-entry campaigns. It features a user-friendly interface and flexible budgeting that scales down well for mid-market or regional billboard testing.
• Perion (Hivestack) — Built for advanced, enterprise-level and global multi-channel campaigns with heavy programmatic automation.
• The Trade Desk — The premier enterprise-grade independent DSP if you want to bundle your billboard and DOOH buys into a massive, holistic cross-channel strategy (display, video, CTV, audio).
• StackAdapt — A top-tier self-serve DSP known for an intuitive interface, robust AI bid optimization, and unified multi-channel campaign management.

To help narrow down which platform fits your exact needs, let me know:

• What is your approximate monthly or campaign budget?
• Are you looking for hyper-local roadside billboards or a multi-market national campaign?
• Do you plan to manage this self-serve or through an agency/managed service?

To buy digital billboard and outdoor screen space programmatically, you need a Programmatic Digital Out-of-Home (pDOOH) Demand-Side Platform (DSP) . These platforms connect via Supply-Side Platforms (SSPs) to a vast array of media owners (like Lamar, OUTFRONT, and JCDecaux) allowing you to bid on inventory in real time, set triggers (like weather or time of day), and measure impressions dynamically.

The top pDOOH platforms vary based on your technical needs, budget, and campaign scale:

• Vistar Media stands out as the premier pure-play programmatic DOOH marketplace and ad server, offering massive global scale, precise audience data/mobile location signals, and robust self-serve or managed execution.
• Perion (incorporating Hivestack) provides a comprehensive, AI-native omni-channel and pure-play DOOH demand-side platform optimized for global scale, targeting, and advanced measurement capabilities.
• The Trade Desk serves as the ideal choice if you want to integrate digital billboard buying into a massive, multi-channel digital campaign alongside Connected TV (CTV), mobile, and display.
• AdQuick excels in a specialized OOH workflow, letting you plan and buy both traditional and programmatic digital billboards in a single interface with transparent, upfront real-time availability and pricing.
• Adomni works best for fast, flexible, and approachable self-serve buying with lower barriers to entry, making it popular for regional or localized digital billboard campaigns.
• Place Exchange functions as a flexible OpenRTB-native exchange connecting direct DOOH inventory seamlessly to major enterprise DSPs like Google DV360 and The Trade Desk.

To help narrow down the best fit, tell me:

• What is your approximate budget or minimum commitment expectation?
• Are you looking for a self-serve platform or a fully managed service?
• Do you need hyper-local/regional targeting or national/global scale?

If you’re looking to buy billboard inventory programmatically (rather than calling billboard operators one by one), you’re looking for a programmatic DOOH (pDOOH) DSP/marketplace. Good options include:

A typical workflow looks like:

1. Pick markets or locations (e.g., highways, downtown corridors, near stores).
2. Define targeting:
   • geography/radius
   • audience segments
   • time of day
   • weather or contextual triggers
3. Upload creative (static image, animation, or video depending on screen specs).
4. Bid or reserve impressions.
5. Receive proof-of-play and reporting.

If your goal is specifically digital highway billboards, local SMB self-serve buying, or national brand campaigns, the best platform choice changes. For a small-to-mid advertiser wanting to pick actual billboard locations online, I’d look first at AdQuick or Goldfish; for agency-scale programmatic buying, Vistar/Place Exchange/Hivestack or a DSP like StackAdapt are more typical.

If you mean a platform where you can programmatically buy digital billboard inventory via API, rather than manually contacting billboard owners, these are the strongest options:

My first choice: Vistar Media

Vistar is probably the closest match if you're building a programmatic application. It exposes APIs for DOOH workflows, and its exchange supports real-time bidding using OpenRTB 2.x.

It also has an Ad Serving API for requesting ads and reporting proof-of-play, which is useful if you're integrating the buying/serving workflow into your own software.

If you want maximum inventory access

Place Exchange is another strong option. It connects buyers to OOH inventory from major providers and supports programmatic deals and open auctions. Its current platform documentation specifically describes API-based creation/management of inventory units and programmatic deals.

If you're actually building your own DOOH buying platform

I'd architect it around Vistar + Hivestack + Place Exchange/Broadsign, rather than trying to contract individually with billboard operators. Hivestack, for example, explicitly provides an OpenRTB integration for third-party DSPs.

That gives you roughly:

Your application → your bidding/targeting engine → DOOH SSPs/exchanges → billboard operators

You can then expose your own API such as:

POST /campaigns
POST /campaigns/{id}/targeting
POST /campaigns/{id}/bid
GET  /inventory
GET  /campaigns/{id}/delivery
GET  /campaigns/{id}/proof-of-play

If your goal is “give my software an API where I specify ZIP codes, dates, budget, audience, and creative, and it automatically buys available billboards”, tell me that—that narrows the field considerably, and I can identify the best self-serve/API-accessible options rather than ordinary DOOH DSPs.

To buy digital billboard and out-of-home (OOH) space programmatically, you will need a Demand-Side Platform (DSP) built or integrated for programmatic digital out-of-home (pDOOH).

The best platform depends on your budget, whether you prefer a self-serve portal or an enterprise omnichannel setup, and if you need managed planning help.

Top Programmatic DOOH Platforms

• Vistar Media — Best overall for global and domestic scale. It operates as both a powerful DSP and supply-side infrastructure (SSP), offering deep mobile audience data integration, robust targeting, and massive billboard and place-based inventory.
• Adomni — Best for simplified, self-serve US campaigns. Highly friendly for first-time buyers or smaller budgets, featuring transparent pricing, map-based selection, and quick campaign launches.
• AdQuick — Best hybrid option for planning both traditional static outdoor media and programmatic digital boards. Offers a self-serve programmatic DSP alongside expert in-house managed services.
• The Trade Desk — Best enterprise-grade omnichannel DSP. If you already run display, video, or Connected TV (CTV) campaigns and want to layer programmatic billboards into a massive unified media strategy, this is the industry standard.
• Blindspot — Best for per-play, granular screen-level control across dozens of international markets with no high-cost minimum commitments.
• Hivestack (by Perion) — Best for advanced, data-heavy programmatic campaigns and multi-market enterprise agency execution.

To help me narrow down the ideal platform for your specific needs, please tell me:

• What is your approximate budget or minimum spend expectation?
• Are you looking for a purely self-serve portal or a managed service?
• Are you buying strictly large digital billboards , or also including transit and place-based screens (gyms, urban kiosks, retail)?