ads_kit

A mediation-platform-independent ad abstraction for Flutter apps. Your app code depends only on ads_kit — never on a mediation SDK directly — so swapping ad providers is a remote-config value, not a store release.

Provider implementations live in their own packages (e.g. ads_kit_levelplay for Unity LevelPlay, ads_kit_max for AppLovin MAX) and translate their SDK's types into this package's vocabulary. No ad-SDK type ever crosses into ads_kit's public API.

What you get

• AdProvider — the contract every mediation package implements: init/dispose, preload, readiness, fullscreen shows, banner widget, and a single AdEvent stream.
• AdManager — the one entry point the app talks to. Reads Firebase Remote Config, resolves the active provider, falls back through fallback_provider down to a built-in no-op provider ("no ads" always beats "wrong ads"), preloads enabled formats, and recovers back to the configured provider on a cooldown after an automatic fallback.
• FrequencyGuard — mandatory interstitial pacing (cold-start grace, minimum interval, session cap, per-country disable) to keep policy risk down.
• HealthMonitor — consecutive-failure tracking that triggers the fallback chain. No-fill is treated as inventory, never as provider failure.
• Typed events — AdEventLoaded/Shown/Dismissed/RewardEarned/... and a normalized AdRevenue per impression, comparable across providers.
• Consent plumbing — AdConsent (GDPR/CCPA/COPPA/ATT) applied at init and updatable mid-session via AdManager.updateConsent.

Usage

// main.dart — register whichever provider packages this app ships with.
AdManager.register('levelplay', () => LevelPlayAdProvider());

await AdManager.boot(
  consent: myResolvedConsent,
  providerExtras: {
    'levelplay': {
      'app_key_android': '...',
      'app_key_ios': '...',
      'rewarded_ad_unit_id_android': '...',
      'rewarded_ad_unit_id_ios': '...',
    },
  },
);

// Anywhere else in the app:
final result = await AdManager.I.showRewarded();
// Fullscreen show futures resolve when the ad is *dismissed* — safe to
// continue your flow (navigate, grant rewards) the moment they complete.

_android/_ios key suffixes resolve to the running platform, so one shared config serves both.

Remote config

One Firebase Remote Config string parameter, ads_config, holding JSON. Every field is optional; missing or malformed input degrades to safe defaults, and no config at all means no ads:

{
  "active_provider": "levelplay",
  "fallback_provider": "noop",
  "formats_enabled": ["rewarded"],
  "interstitial_min_interval_sec": 60,
  "interstitial_max_per_session": 3,
  "cold_start_grace_sec": 30,
  "health_failure_threshold": 3,
  "recovery_cooldown_sec": 300,
  "recovery_max_attempts": 3,
  "providers": {
    "levelplay": {"app_key_android": "...", "app_key_ios": "..."}
  }
}

Flipping providers without a release: change active_provider, or call AdManager.switchProvider('max') directly.

Writing a provider package

Implement AdProvider, translate every SDK type at the boundary, and emit AdEventFailed for every load/show failure — the health monitor counts those events as its only signal. See the repository for two complete reference implementations and the full design notes.