Shared from "Merlin Backend" on Inkdown
The rate limiting system prevents abuse and ensures fair resource allocation across users. It uses Redis-based sliding window counters with plan-based limits.
File: src/server/middlewares/rateLimiter/rateLimiter.ts
How It Works:
userPlan === "GUEST")arcane_guest:{ip}File: src/server/middlewares/usageLimits/usageLimits.ts
Plan Limits:
| Plan | Daily Queries | Monthly Queries | Concurrent Requests |
|---|---|---|---|
| GUEST | 100 | 500 | 1 |
| FREE | 500 | 5,000 | 2 |
| PRO | 2,000 | 20,000 | 5 |
| ULTRA | 5,000 | 50,000 | 10 |
File: src/server/middlewares/usageLimits/functions/saveDailyUsage.ts
Usage Schema:
Some operations count tokens instead of queries:
File: src/server/middlewares/aiToolsUsageLimits/aiToolsUsageLimits.ts
Special limits for expensive AI features:
File: src/server/middlewares/usageLimits/usageLimits.ts
Applied in routing:
The rate limiting system:
Key Principle: Protect resources while providing clear upgrade paths. Never silently fail - always tell users their limits.