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Fixed window counter.

also: fixed window · fixed-window counter · fixed window rate limiting

Counting requests per fixed time slot (each minute) and resetting at the boundary; simple, but allows up to 2× bursts across a boundary.

the two-minute refresher

One counter per key per window: INCR, and reject above the limit.
Very cheap: one integer per key.
Flaw: 100 requests at 00:59 and 100 at 01:00 pass a 100/minute limit, twice the rate.

Where the course teaches it

W01 · Day 3Rate Limiting at Scalelearn it →

Related concepts

Sliding window counter
Sliding window log
Token bucket