Ad Mediation for HTML5 Games: Is Running Multiple Networks Worth It?

A single ad network will occasionally have nothing to show — no matching advertiser demand for that impression, that geography, that moment — and every unfilled impression is revenue left on the table. Mediation exists to solve exactly that: instead of one network, your game requests an ad from several at once and shows whichever responds with the best price, so an empty slot from one network gets caught by another instead of going unfilled.

Waterfall vs. real-time bidding, briefly

Older mediation setups use a waterfall — networks are tried in a fixed priority order, usually ranked by historical average rate, and the first one to fill the impression wins regardless of whether a lower-ranked network would have paid more this specific time. Modern mediation increasingly uses real-time bidding instead, where networks compete on that exact impression simultaneously and the actual highest bid wins. Bidding setups generally out-earn a static waterfall, but not every mediation platform or every network partner supports it yet.

What mediation actually costs you to run

• One extra SDK integration up front — the mediation layer itself — even though it then manages the individual network SDKs for you.
• More configuration surface: priority order or bid floors per network, per ad format, sometimes per geography, all of which need periodic review as network performance shifts.
• A slightly more complex consent flow, since multiple underlying networks each need to respect the same player consent decision consistently.
• More things that can silently break — a single network's SDK update or outage is now one failure mode among several, harder to isolate than a single direct integration.

When it's actually worth the added complexity

Mediation earns its keep once a single network's fill rate is visibly leaving impressions unfilled — check your own network dashboard for fill rate, not just eCPM, since a high eCPM on a low fill rate can still mean a lot of missed revenue. For a new or low-traffic game, a single well-chosen direct network is usually simpler to run and easier to debug when something looks wrong; add mediation once volume is high enough that the uplift clearly outweighs the added integration and maintenance surface.

The simpler alternative worth naming directly

If the appeal of mediation is really "stop leaving impressions unfilled" rather than the specific control it gives you, publishing through a portal that already runs this optimization on your behalf accomplishes the same goal without you integrating or maintaining any of it — PlayKovo's ad delivery is handled centrally for every game using the SDK, so an individual developer never has to build or tune a mediation stack themselves. See the SDK integration docs for what that looks like from your game's side.

This pairs directly with which ad networks to actually use — read that one first if you haven't picked a starting network yet.