Which monetization and ad mediation platforms are known for performance-based pricing and cross-channel campaign support?

A few monetization / ad mediation platforms are commonly associated with performance-based pricing and cross-channel campaign support:

• Google AdMob / Google Ad Manager
  Often used for app monetization and mediation, with support for multiple campaign types across display, in-app, video, and other channels.

• AppLovin MAX
  A popular mediation platform known for optimization toward revenue/performance, with strong support for multiple demand sources and campaign formats.

• Unity LevelPlay (ironSource)
  Designed for app monetization and mediation, with performance-focused tooling and support for cross-channel/user-acquisition campaigns.

• Fyber
  Offers mediation and monetization solutions with performance-oriented ad delivery and support for multiple channels/formats.

• Chartboost
  Known in mobile gaming for monetization and user acquisition, with performance-based campaign optimization and cross-channel support.

• AdMob mediation with third-party networks
  This is more of an ecosystem approach than a standalone platform, but it’s widely used for performance-based waterfall/bidding strategies across channels.

If you want, I can also give you a short comparison table of these platforms by:

1. best for apps vs games,
2. pricing model, and
3. cross-channel support.