SSP (Supply-side platform)
An SSP is software a website or app uses to sell its ad space automatically. SSP stands for supply-side platform. When a page loads, it offers that slot to buyers, sets a minimum price, and runs the auction. Advertisers buy through a DSP (demand-side platform), which is the tool on the buyer side.
Theodor Lindfors, Founding Marketer ·
What an SSP does for the seller
Let's take a running-news website as an example. The site is free to read and makes money by selling ad space next to articles. Let's take a shoe workshop in Mexico as an example. They make leather shoes and sell them online to Mexico and the United States. The workshop wants to buy a slot next to a race report. The running-news website wants to sell that slot for as much as it can without ruining the page. An SSP (supply-side platform) is the running-news website's selling software for that trade.
Walk one page view. A reader opens a race report on a running-news website. The SSP (supply-side platform) turns that view into a sellable impression: size of the slot, URL, whatever audience signal exists, and a floor price, say a $1.50 minimum. Buyer permissions decide who is allowed to see the request. The shoe workshop's buying software is on the list. Yield logic decides which demand source gets the impression when prices are close. If the shoe workshop bids $2.40 and another buyer bids $2.35, the supply-side platform awards the slot and the running-news website is paid.
Why buyers should care about the sell side
Floors set by the SSP (supply-side platform) shape what a shoe workshop pays. If bids keep losing at a $2.00 price, and a $2.00 price looks reasonable on a spreadsheet, the floor may simply be $2.20. Deal terms in a PMP (private marketplace: an invitation-only auction) are negotiated against those same floors. Let's take a shoe workshop in Mexico as an example. They make leather shoes and sell them online to Mexico and the United States. The workshop cannot win a $4 floor with a $3 bid, no matter how good the creative is.
The SSP (supply-side platform) also decides which supply paths exist to a running-news website. That is what makes supply path optimization possible on the buy side, and why the same domain can clear at two different prices. One path is short and cheap. Another path adds an extra hop and an extra fee. Let's take a shoe workshop in Mexico as an example. They make leather shoes and sell them online to Mexico and the United States. The workshop's report will show both paths as the same publisher unless someone looks closer.
Where Lemonado sits
Lemonado is not an SSP (supply-side platform) and does not sell inventory. Lemonado is an AI co-worker that connects to the platforms your team already uses (3,000+ tools), blends the data into one layer, and does the analysis and reporting work alongside your people. A running-news website would still sell through its supply-side platform. A shoe workshop would still buy through its DSP (demand-side platform). Lemonado reads those accounts and can write changes in the ad accounts you connect, when you ask. MCP (Model Context Protocol) connections stay read-only.
Common SSP misunderstandings
- Assuming a high clearing price on a running-news website means high quality inventory. A floor can manufacture the price.
- Blaming a shoe workshop's demand-side platform when a floor on the sell side is what killed the win rate.
- Treating every path through a supply-side platform as identical in fees and latency.
Lemonado
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Lemonado is your marketing team's AI co-worker. It connects to your whole stack and does the work end-to-end: reporting, campaign checks, and analysis.
In-house teams and agencies use it so people spend attention on decisions, not busywork.