R

What is Rate limiting?

Definition, examples, and more

Definition

A backend mechanism that limits how often users can trigger certain subscription-related actions (e.g., restore, trial start, promo redemptions) within a set time frame. This helps prevent abuse, fraud, and system overload.

Example

A subscription app limits restore purchase attempts to 5 per hour per user and promo code redemptions to 3 per day. When a fraud ring attempted to exploit a referral promo code, rate limiting capped losses at $500 instead of the potential $50,000 exposure.

Why Rate limiting Matters

Without rate limiting, bad actors can exploit your subscription system. A wellness app had no limits on their referral code system. A fraud group generated thousands of fake accounts and redeemed $30K in free subscriptions before the team noticed. Rate limiting would have caught this in minutes instead of weeks.

Frequently Asked Questions

What subscription actions should be rate limited?

Restore purchases, trial starts, promo code redemptions, subscription status checks, and receipt validation requests. Set limits generous enough for legitimate use but restrictive enough to prevent abuse.

What are reasonable rate limits?

Restore: 5-10/hour. Trial start: 1-2/day per device. Promo redemption: 3-5/day. Receipt validation: 20-50/hour. Adjust based on your normal usage patterns — analyze legitimate user behavior first.

How do I implement rate limiting?

Implement on your backend using token bucket or sliding window algorithms. Track by user ID and device ID. Return clear error messages ('Please try again later') rather than failing silently. Log rate-limit hits for fraud detection.

Category
Subscription App Terminology
Related Area
Mobile App Growth & Monetization
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Reactivation

More terms starting with “R”

Reactivation

When a previously churned or lapsed subscriber returns and resumes their subscription. Reactivations are a part of lifecycle marketing and often driven by email/push campaigns, pricing incentives, or product improvements.

Recurring revenue

Revenue generated on a consistent, repeatable basis through subscription renewals. Recurring revenue is the foundation of subscription businesses and a key metric for forecasting, valuation, and capital efficiency.

Refund rate

The percentage of in-app purchases or subscriptions that are refunded due to user dissatisfaction or platform policy. High refund rates can signal poor value perception, billing issues, or onboarding problems and may impact platform standing or reported revenue.

Renewal

The continuation of a subscription after a billing period ends, either manually or through auto-renew. Renewals are a core component of recurring revenue and serve as key milestones in a user's lifecycle.

Renewal rate

The percentage of subscribers who successfully renew at the end of their billing cycle. High renewal rates are indicative of strong product-market fit, perceived value, and customer satisfaction.

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