cloud-storage-and-file-sharing APIs

Box is an enterprise cloud content management platform with a comprehensive API for uploading, downloading, organizing, and sharing files programmatically.

ddownload is a file hosting and sharing service that exposes an API for uploading files, checking account stats, and managing stored files programmatically.

Dropbox provides a widely-used REST API for accessing, uploading, and managing files and folders stored in Dropbox accounts, including shared folders and Business team spaces.

File.io is an ephemeral file sharing API that returns a one-time download link after upload — once the file is downloaded, it is automatically deleted from the server.

Filestack is a file handling API that lets you upload, transform, and deliver files from any source — local disk, URL, cloud storage, or social network.

GoFile is a free file hosting API that lets you upload files of any size without an account and receive a generated download link in return.

The Google Drive API lets you read, write, and manage files stored in Google Drive programmatically via OAuth 2.0.

Gyazo is a screenshot hosting API that accepts an image upload and returns a permanent shareable URL with associated metadata like capture time and application info.

Imgbb is a free image hosting API that accepts an image via URL, base64 string, or multipart upload and returns a permanent hosted link along with thumbnail variants.

The OneDrive API (part of Microsoft Graph) lets you read, upload, and manage files in a user's OneDrive storage using OAuth 2.0.

Pantry is a free, no-signup JSON storage API designed for small projects and prototypes that need simple key-value persistence without a database.

Pastebin's API lets you create, read, and delete pastes — snippets of text or code stored at a shareable URL — programmatically.

Pinata is an IPFS pinning service API that lets you upload files to the InterPlanetary File System and keep them persistently accessible by "pinning" them on Pinata's infrastructure.

Quip's API provides programmatic access to collaborative documents and spreadsheets in Quip (a Salesforce product), letting you read thread content, create new documents, and post messages to document threads.

Storj is a decentralized cloud storage platform that splits, encrypts, and distributes files across thousands of independent nodes worldwide.

Web3 Storage (now operating as Storacha) lets you upload files to a decentralized storage network built on IPFS and Filecoin, receiving a content-addressed CID for each upload.