Filestack vs The Null Pointer

Filestack is a file-upload and processing API that handles ingestion from local disk, cloud drives, and URLs, plus on-the-fly transformations like image resizing and document conversion. A live POST against the real gateway, www.filestackapi.com/api/store/S3, returned a 400 without a valid key, reconfirming API-key auth and HTTPS, and a follow-up OPTIONS preflight echoed the request Origin in Access-Control-Allow-Origin, resolving cors from unknown to yes. Filestack starts with a free plan for low-volume use and scales into paid Growth, Pro, and Enterprise tiers as upload and processing volume grows.

The Null Pointer (0x0.st) is a minimalist, no-account temporary file host and URL shortener: a plain POST with a file returns a bare URL as the entire response body, with retention scaled by file size. A live OPTIONS preflight with an Origin header against the real host, 0x0.st, returned a 200 with no Access-Control-Allow-Origin header, resolving cors from unknown to no; no auth is required for uploads, and HTTPS was reconfirmed. It's a single free, ad-free service with no paid tier, retaining files from 30 days up to 1 year depending on size (max 512MiB).