Cloud Storage APIs

Cloud storage APIs handle over 100 trillion objects globally, and the economics of storing and serving files have shifted dramatically as Cloudflare R2's zero-egress pricing forced competitive responses across the industry. AWS S3 remains the default for most teams due to ecosystem depth and tooling maturity, but egress fees of $0.09/GB add up fast for media-heavy applications — a single terabyte of monthly downloads costs $90 on S3 versus $0 on R2. Backblaze B2 offers S3-compatible APIs at roughly one-fifth of AWS storage pricing, with free egress to Cloudflare CDN through the Bandwidth Alliance. For teams requiring data sovereignty or on-premises deployment, MinIO provides a production-grade S3-compatible gateway that runs on any infrastructure. The 2026 storage API landscape increasingly bundles compute with storage: Cloudflare R2 integrates with Workers for edge processing, Vercel Blob offers zero-config file storage for Next.js applications, and Supabase Storage provides row-level security policies tied to your database authentication. When designing file upload flows, presigned URLs have become the standard pattern — generating a time-limited upload URL server-side avoids routing large files through your application servers. Multipart upload support matters for files over 100MB, and resumable uploads are critical for mobile applications with unreliable connectivity. Evaluate CDN integration carefully: some storage providers include built-in CDN distribution (Cloudflare R2, Vercel Blob), while others require separate CDN configuration. For image and video-heavy applications, check whether the provider offers built-in transformation APIs — on-the-fly resizing, format conversion to WebP/AVIF, and video transcoding can eliminate the need for separate processing pipelines and reduce storage costs by 40-60%.