How to Build a Retail Media Network: Build vs Buy 2026

To build a retail media network, establish advertiser demand and a measurable shopping experience before choosing the platform. Decide which placements you can sell, how purchases will be attributed and who will operate the service. Compare software, bundled demand and owned infrastructure against those requirements.

The Economics of Retail Media Technology

Before diving into build vs buy, understand the stakes:

Build: own code and operations

Advantages of Building

• Complete customization: Build exactly what you want (brand, features, integrations)
• Full IP ownership: You own the codebase and can monetize it (white-label to others)

Disadvantages of Building

• Technical risk: Scaling, performance, and security are hard, most teams underestimate complexity
• Ongoing maintenance burden: Continuous updates, bug fixes, infrastructure management

Buy: licensed platform and operations

Disadvantages of Buying

• Limited deep customization: Highly configurable, but not fully custom

Hybrid Model: Best of Both Worlds

Many sophisticated retailers choose a hybrid approach:

• Build custom layer on top (unique brand experience, proprietary ML models, specialized integrations)

Example: Hybrid Implementation

Best for: Retailers who want differentiation without reinventing the wheel. Middle ground between speed and control.

Decision Framework with 3-Year ROI Calculator

Input Variables

• Annual shopper traffic (website visits/year)
• Active advertiser brands (number of CPG partners)

Risk Assessment Matrix

Conclusion: Most Retailers Should Buy Infrastructure, Invest in Differentiation

The data is clear: for the vast majority of retailers, buying (or hybrid) delivers better ROI, lower risk, and faster time-to-market than building from scratch.

Key insight: RTB infrastructure is commoditized, it's "solved technology." The real competitive advantage comes from:

• Quality of first-party shopper data (yours is unique)
• Sales relationships with advertisers (your brand partnerships)
• Creative and measurement capabilities (your insights)

Download Build vs Buy Comparison Sheet

• retail media network platforms compared
• retail media economics calculator
• commerce media networks directory
• retail media

Read the retail media guide for the broader decision framework.

What is a retail media network platform? It is the software that lets a retailer sell and serve ads on its own site, app, emails and stores, target them with its shopper data, and report sales back to brands. Platforms come as demand bundles (Criteo, Epsilon), as software (Kevel, Topsort, Moloco, Mirakl Ads, Pentaleap, Osmos), or as another retailer's service (Amazon Retail Ad Service, Instacart Carrot Ads). The retail media hub collects the related guides.

Which retail media platform does Walmart use? Its own. Walmart Connect runs on in-house technology, uses The Trade Desk as a DSP partner for offsite, and has added owned screens and buying tools through acquisitions: Vizio for about $2.3 billion on 3 December 2024 and Vibe.co, completed 4 August 2026 (Walmart, 3 December 2024; Vibe.co, 4 August 2026; Tinuiti, 18 May 2026). Kroger similarly runs on its 84.51° unit (Tinuiti, 18 May 2026).

How much does a retail media platform cost? Vendors do not publish price lists. The models that are public or reported are: a percentage of media spend plus platform fees (Criteo), SaaS without revenue share (Kevel), a per-spend or platform fee (Osmos), pay-for-outcomes (Rokt) and, in one Moloco customer's case, cost per order (Osmos, 4 June 2026; Rokt; Moloco). Ask for the effective take rate at your expected spend, including any demand fee, and compare it with the glossary definition of take rate.

Criteo vs Kevel: what is the difference? Criteo sells a network: its Commerce Max DSP brings brand and agency demand, including Google Search Ads 360 buyers in beta since 10 September 2025, to "over 200" retailers, and it charges a share of spend (Criteo, 10 September 2025; Osmos, 4 June 2026). Kevel sells the engine: ad-serving APIs, a self-serve console, audience tools and an exchange, on SaaS pricing without revenue share, used by Home Depot, Chewy and Dollar General among others (Kevel, accessed 17 October 2026; Osmos, 4 June 2026). The first is faster to revenue; the second keeps the advertiser relationship with the retailer.

Can a retailer build its own retail media platform? Yes, and the largest do: Walmart, Kroger through 84.51°, and Amazon, which now sells its stack to others (Tinuiti, 18 May 2026; Amazon Ads). Below that scale the honest answer is "build the parts that differentiate, license the rest": an owned clean room and data layer, an owned or white-label DSP for offsite, and a licensed or open-source ad server underneath. Vendor frameworks put the full custom build at $10 billion-plus GMV (Osmos, 4 June 2026); the sequencing is in Retail media infrastructure: build vs buy.

1. Criteo, "Criteo and Google announce onsite retail media integration" (10 September 2025). https://www.criteo.com/news/press-releases/2025/09/criteo-and-google-announce-onsite-retail-media-integration/
2. Criteo, "Criteo announces intention to redomicile to Luxembourg and list ordinary shares on Nasdaq" (31 October 2025). https://www.criteo.com/news/press-releases/2025/10/criteo-announces-intention-to-redomicile-to-luxembourg-and-list-ordinary-shares-on-nasdaq/
3. Criteo, "Criteo and Zepto partner to drive the next wave of quick commerce in India" (21 August 2025). https://www.criteo.com/news/press-releases/2025/08/criteo-and-zepto-partner-to-drive-the-next-wave-of-quick-commerce-in-india/
4. Criteo, "Criteo partners with Hyundai Department Store to strengthen retail media business" (8 April 2026). https://www.criteo.com/news/press-releases/2026/04/criteo-partners-with-hyundai-department-store-to-strengthen-retail-media-business/
5. Criteo, "Criteo and DoorDash expand partnership to Canada" (16 April 2026). https://www.criteo.com/news/press-releases/2026/04/criteo-and-doordash-expand-partnership-to-canada-as-on-demand-delivery-of-grocery-and-retail-items-accelerates/
6. Criteo, "Criteo partners with Lidl to expand onsite retail media" (19 May 2026). https://www.criteo.com/news/press-releases/2026/05/criteo-partners-with-lidl-to-expand-onsite-retail-media/
7. Criteo, "Massmart accelerates retail media offering in South Africa with Criteo" (22 July 2026). https://www.criteo.com/news/press-releases/2026/07/massmart-accelerates-retail-media-offering-in-south-africa-with-criteo/
8. Criteo, "Criteo and Loblaw Advance partner to expand advertiser access to premium retail media network" (5 August 2026). https://www.criteo.com/news/press-releases/2026/08/criteo-and-loblaw-advance-partner-to-expand-advertiser-access-to-premium-retail-media-network/
9. Criteo, "Criteo reports second quarter 2026 results" (5 August 2026). https://criteo.investorroom.com/2026-08-05-CRITEO-REPORTS-SECOND-QUARTER-2026-RESULTS
10. Criteo, press releases index (accessed 17 October 2026). https://www.criteo.com/news/press-releases/
11. Kevel, home page (accessed 17 October 2026). https://www.kevel.com/
12. Kevel, "About" (accessed 17 October 2026). https://www.kevel.com/about
13. Topsort, home page (accessed 17 October 2026). https://www.topsort.com/
14. Topsort, "About" (accessed 17 October 2026). https://www.topsort.com/about
15. Mirakl, "Mirakl Ads" (accessed 17 October 2026). https://www.mirakl.com/products/mirakl-ads
16. Mirakl, home page (accessed 17 October 2026). https://www.mirakl.com/
17. CitrusAd / Epsilon Retail Media, home page (accessed 17 October 2026). https://www.citrusad.com/
18. Epsilon, "Retail media network" (accessed 17 October 2026). https://www.epsilon.com/us/products-and-services/retail-media-network
19. Moloco, "Moloco Commerce Media" (accessed 17 October 2026). https://www.moloco.com/products/moloco-commerce-media
20. Moloco, "About" (accessed 17 October 2026). https://www.moloco.com/about
21. IAB Europe, "Moloco becomes first technology provider to achieve IAB Europe Retail Media Certification" (7 October 2026). https://iabeurope.eu/moloco-becomes-first-ad-tech-company-to-achieve-iab-europe-retail-media-certification-marking-major-expansion-of-the-program/
22. Vantage, home page (accessed 17 October 2026; Triangle Retail Media release 19 March 2026). https://www.gotvantage.com/
23. Koddi, home page and "About" (accessed 17 October 2026). https://www.koddi.com/ and https://www.koddi.com/about
24. IAB Europe, "IAB Europe In-Store and Travel Media Measurement open for public comment" (17 September 2026). https://iabeurope.eu/iab-europe-in-store-and-travel-media-measurement-open-for-public-comment/
25. Zitcha, home page and "Contact" (accessed 17 October 2026). https://www.zitcha.com/ and https://www.zitcha.com/contact
26. Pentaleap, home page (accessed 17 October 2026). https://www.pentaleap.com/
27. Osmos, home page (accessed 17 October 2026). https://www.osmos.ai/
28. Osmos, "Build vs buy retail media ad tech stack: decision framework and vendor comparison (2026)" (4 June 2026, updated 23 September 2026). https://osmos.ai/blog/build-vs-buy-retail-media-ad-tech-stack-2026
29. Instacart, press releases index, "Instacart and Gopuff announce new, first-of-its-kind partnership in the U.S." (22 September 2026). https://company.instacart.com/pressreleases
30. Amazon Ads, "Amazon Retail Ad Service" (beta; accessed 17 October 2026). https://advertising.amazon.com/retail-ad-service
31. Symbiosys, home page (accessed 17 October 2026). https://www.symbiosys.ai/
32. Rokt, home page (accessed 17 October 2026). https://www.rokt.com/
33. Walmart, "Walmart completes acquisition of Vizio" (3 December 2024). https://corporate.walmart.com/news/2024/12/03/walmart-completes-acquisition-of-vizio
34. Vibe.co, "Walmart completes acquisition of Vibe.co" (4 August 2026; announcement 23 June 2026). https://www.vibe.co/blog/whats-new/walmart-completes-acquisition-of-vibeco
35. Tinuiti, "Retail media networks: the complete guide" (18 May 2026). https://tinuiti.com/blog/ecommerce/retail-media-networks/
36. IAB, "Building a More Competitive Commerce Media Ecosystem" (14 April 2026). https://www.iab.com/guidelines/building-a-competitive-commerce-media-ecosystem/
37. IAB/MRC, "Retail Media Measurement Guidelines" (January 2024). https://www.iab.com/wp-content/uploads/2024/01/IAB_Retail_Media_Measurement_Guidelines_January2024.pdf

• October 18, 2026: aligned the approved search title and heading; retained the original publication date.

• October 17, 2026: updated search phrasing, source-linked reference context, author and dates. Withheld numerical claims without inline sources.