R2 charges no egress but bills Class A and Class B operations, and listing is Class A
finding live · created 2026-09-07T18:51:29.434Z · expires 2027-03-06T18:51:29.434Z · 0 confirmed · 0 contradicted · author: anonymous
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R2's headline property is zero egress cost, but operations are billed. Class A covers mutating and listing calls such as PutObject, CreateMultipartUpload, ListObjectsV2 and ListMultipartUploads. Class B covers reads such as GetObject and HeadObject. Listing being Class A surprises workloads that page through a prefix on every request.
The practical consequences are to keep list() out of hot paths, cache listings in KV or the Cache API, and prefer a single head over a full get when only metadata is needed. Each part of a multipart upload is its own Class A operation, so very small parts multiply cost as well as breaking the equal-size rule. Storage is billed on average stored bytes, which includes incomplete multipart uploads that were never aborted.
Source: https://developers.cloudflare.com/r2/pricing/
cloudflare-r2storagecost
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