Backfill Ad Placement Guide

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Overview

Backfill ads automatically fill inventory when there are no direct ads. Because they aren’t pre-screened by the publisher the way direct ads are, how you surface them has an outsized effect on click-through rate, completion rate, and user experience. This page covers recommended placement strategies per ad format and the best practices that maximize revenue without degrading UX.

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Strategy at a Glance

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Rewarded Ads: Confirm User Intent

Rewarded Backfill is a value-exchange model where the user voluntarily watches an ad to earn a reward. Confirming user intent before showing the ad raises both click-through rate and completion rate.

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Recommended Patterns

1. Action button that names the reward Make the reward explicit in the button label.

• ✅ “Watch video to earn a life”
• ✅ “Watch ad to get 100 coins”
• ❌ “Watch ad” (reward unclear)
• ❌ “Continue” (doesn’t signal it’s an ad)

2. Sync the UI with ad readiness Disable or hide the action button when no ad is ready, so users don’t tap into an empty response. A failed first attempt rarely leads to a second. 3. Design natural entry points Surface the option at moments where the user actually wants the reward.

• When the player is out of lives/turns in a game
• When the user wants to unlock paid content one time
• For daily check-in or mission rewards

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Patterns to Avoid

• Auto-playing the ad without explicit user selection
• Pressure copy like “skip and lose your reward”
• Vague prompts where the user can’t tell what they’ll get for watching

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Interstitial Ads: Natural Transition Points

Interstitials cover the entire screen, so the most important thing is to show them at moments that don’t interrupt the user’s flow.

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Recommended Moments

• Game level / stage transitions: between rounds
• End of a content unit: after an article, video, or chapter
• Screen transitions: home → detail, results → home, etc., where the user clearly perceives a transition
• Session resume: when the user returns after a background period (Splash ads can also fit here)

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Apply Frequency Capping

Showing interstitials too often increases ad fatigue and leads to blocking or uninstalls.

• Maintain at least a 1-3 minute interval between impressions for the same user
• Consider a per-session cap on total impressions

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Patterns to Avoid

• Showing immediately after a user action (tap, input) → accidental clicks
• Showing during active gameplay → breaks the flow
• Showing right at app launch → before the user has perceived any value

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Native Ads: Blend with Content Flow

Native Backfill ads are visually integrated with surrounding content. The balance is to blend in naturally while still clearly labeling the unit as an ad.

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Recommended Patterns

• Insert into feeds/lists at consistent intervals (e.g., one ad per 5-10 content items)
• Match typography, corner radius, and spacing with surrounding content
• Show a clear “Ad” / “Sponsored” label to prevent mistaken clicks
• Reserve container size in advance to avoid layout shift (CLS) when the ad loads

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Patterns to Avoid

• Blending so deeply that ads are indistinguishable from content (policy risk)
• Stacking ads on the first screen
• Unsized containers that cause content to jump when the ad arrives

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Banner Ads: Anchored Slots

Banner Backfill is the lowest-friction format, so a consistent, anchored placement is recommended.

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Recommended Patterns

• Anchored top or bottom in the safe area
• Positioned so it never overlaps content
• Adaptive slot that handles both portrait and landscape

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Patterns to Avoid

• Floating banners that cover content
• Close buttons placed right next to the ad’s click area → accidental clicks
• Multiple stacked banners on a single screen

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Common Principles

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Preload

If the next impression is predictable, preload the ad in advance. Showing a loading delay at impression time breaks the user flow and can cause the impression to be lost entirely.

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Branch UI by Ad State

Control your UI for each state: ready / load failed / showing / dismissed. For Rewarded especially, disabling the action button on load failure reduces user confusion.

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Manage Frequency and Caps

Define minimum interval and maximum count per user/session to manage ad fatigue. Long-term retention beats short-term revenue, even for Backfill economics.

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Prevent Invalid Traffic

• Separate ad zones from action zones clearly
• Validate the layout to prevent auto-clicks or accidental taps
• Leave a time buffer between user action and ad presentation

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Format Support

For full format support details, see Maximize Revenue with Backfill.

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