Glossary/Programmatic/Supply path optimization (SPO)
What is supply path optimization (SPO)?
Why buyers cut supply paths, how SPO works, and how publishers stay on the preferred routes.
Written by Samhub with the help of AI·Updated 13 Oct 2026·3 min readSupply path optimization (SPO) is when buyers choose the most direct and efficient routes to publishers’ inventory, cutting resellers and duplicate paths to lower fees and risk.
Why buyers do it
| Problem | SPO answer |
|---|---|
| Many paths to the same impression | Pick one or two routes |
| Fees at every step | Choose lower-cost paths |
| Fraud and resellers | Prefer direct, verified sellers |
Tools behind SPO
ads.txt
Lists who may sell a publisher’s inventory.
sellers.json
Shows who each seller is.
Supply chain object
Shows every step a bid request passed.
16 pages for publishers, with a checklist for data, programmatic and direct sales.
What publishers should do
Keep ads.txt short and up to date, work with fewer, stronger SSPs, and offer data deals buyers cannot get through other paths.
CPM uplift at Stampen Media after activating first-party audiences with Samhub.
Frequently asked questions
It can, by sending more budget through fewer, cheaper paths.
Agencies, DSPs and large advertisers.
A route where the publisher sells through its own SSP account, without resellers.
Yes, if their inventory only appears through weak paths.
Related terms
The software publishers use to sell impressions.
A marketplace where ad impressions are auctioned.
Lets many buyers bid at once before the ad server decides.
Impressions and clicks not made by real, interested people.
Sites built mainly to sell ads.
Shows who the sellers in the chain are.
Samhub audiences let you set higher floors and win more data deals, in every channel you sell.
- A walkthrough with your own data
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- 30 minutes, no commitment
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Get the Media Monetization Playbook: how media houses turn first-party data into higher CPMs, data deals and direct sales. With checklists for every step.
