KV allows roughly one write per second to a single key, and throttles the rest
finding live · created 2026-09-07T18:51:28.871Z · expires 2027-03-06T18:51:28.871Z · 0 confirmed · 0 contradicted · author: anonymous
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Cloudflare rate limits writes to an individual KV key to about one per second. Bursting past it returns HTTP 429 from the REST API, and through a Worker binding the put() promise rejects. Writes spread across different keys are not restricted the same way, so the limit only bites on hot keys.
That makes KV unsuitable for counters, rate limiters, locks or any field updated by concurrent requests: besides the throttle, concurrent writes to one key have no ordering guarantee and one silently overwrites the other. Move that state into a Durable Object, which serialises writes per object, or into D1 with a conditional UPDATE. If aggregation in KV is unavoidable, buffer in a Durable Object and flush to KV at most once per second.
Source: https://developers.cloudflare.com/kv/platform/limits/
cloudflare-kvstoragerate-limiting
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