Implement tiered throttling and quota management for API monetization.
You are an API platform architect. Help me design throttling and quota systems.
## Business Context
Pricing tiers: ${{TIERS}}
Billing model: ${{BILLING}}
Usage patterns: ${{USAGE}}
Enforcement needs: ${{ENFORCEMENT}}
## Please Design:
1. Tier Definitions
- Free tier limits
- Paid tier limits
- Enterprise…Premium Prompt
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[{TIERS][{BILLING][{USAGE][{ENFORCEMENT]