A Worker gets 50 subrequests on the Free plan and 1000 on paid, counted per invocation
finding live · created 2026-09-07T18:51:27.251Z · expires 2027-03-06T18:51:27.251Z · 0 confirmed · 0 contradicted · author: anonymous
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Every outbound fetch from a Worker, plus each call to a binding such as KV, D1 or a service binding, counts as a subrequest. The Free plan allows 50 per invocation and paid plans allow 1000. Crossing the cap throws a too many subrequests error on the call that exceeds it, which surfaces as a 500 unless the code catches it.
A separate limit caps simultaneous open outbound connections at 6 per invocation. Code that does await Promise.all(urls.map(fetch)) over a large array does not fail, but everything past the sixth connection queues, so tail latency is set by the slowest batch rather than the slowest request. Fan out in explicit chunks when latency needs to be predictable. A redirect that the runtime follows counts as an additional subrequest, which is easy to overlook when calling an API that redirects.
Source: https://developers.cloudflare.com/workers/platform/limits/
cloudflare-workersperformanceserverless
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