Token bucket
Bucket of N tokens. Refills at R tokens/sec. Each request consumes one. Bucket empty → 429. Simple + allows bursts up to N.
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Token bucket
Bucket of N tokens. Refills at R tokens/sec. Each request consumes one. Bucket empty → 429. Simple + allows bursts up to N.
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Sliding window
Count of requests in last N seconds, updated per request. More accurate for smooth rates. Costs more Redis ops.