# Best file storage and sharing APIs for AI agents (slim)

> Google Drive API + MCP (A), Amazon S3 (BB) and Cloudflare R2 (BB) lead the 14 ranked file storage and sharing APIs. Picks by need, strengths, weaknesses and prices from the Anchor benchmark.

- Full: https://www.anchorterminal.com/best/file-storage/index.md (~6,050 tokens) · this version ~1,580 tokens · JSON https://www.anchorterminal.com/best/file-storage/index.json · canonical https://www.anchorterminal.com/best/file-storage/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

The 10 highest-scoring of 14 file storage and sharing APIs on the Anchor benchmark, with a pick for each need and where each one falls short. Scores come from public evidence, re-checked as vendors change.

- Ranked: 14 · agent-ready (BB or better): 6 · accept x402: 0 · hosted endpoints: 14
- Full ranked table: https://www.anchorterminal.com/categories/file-storage.md
- Head-to-head comparisons: https://www.anchorterminal.com/compare/file-storage/index.md (75)
- Methodology: https://www.anchorterminal.com/benchmark/index.md

## The shortlist

| # | Tool | Grade | Score | Best for | Price | Where |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | [Google Drive API + MCP](https://www.anchorterminal.com/tools/google-drive-api.md) | A | 79.6 | Agents working on files that people already keep in Drive, inside a Workspace organisation with admin controls. | Free | hosted |
| 2 | [Amazon S3](https://www.anchorterminal.com/tools/amazon-s3.md) | BB | 77.9 | Best when the rest of the stack is on AWS or the job needs versioning, Object Lock, replication or event notifications, and when an operator wants per-prefix, per-hour credentials for an agent. | $0.005 / 1k req | hosted |
| 3 | [Cloudflare R2](https://www.anchorterminal.com/tools/cloudflare-r2.md) | BB | 77.1 | Files an agent stores and then serves to the public, where free egress dominates, and for operators who want short-lived, path-scoped credentials. | $0.0045 / 1k req | hosted |
| 4 | [Azure Blob Storage](https://www.anchorterminal.com/tools/azure-blob-storage.md) | BB | 75.7 | Agents and runtimes already on Azure, where a managed identity writes to one container with no stored key, and jobs that need tiers, immutability or geo-redundant copies. | $0.005 / 1k req | hosted |
| 5 | [Supabase API + MCP](https://www.anchorterminal.com/tools/supabase-mcp.md) | BB | 75.6 | Agents building on or administering Supabase projects, and for retrieval that wants vectors, full-text and SQL filters in one database. | $25 / mo | hosted and local |
| 6 | [Backblaze B2](https://www.anchorterminal.com/tools/backblaze-b2.md) | BB | 75.3 | Cheap bulk storage that an agent writes and a CDN serves, and for operators who want an MCP server with real guardrails. | $0.01 / GB | hosted and local |
| 7 | [Box API + MCP](https://www.anchorterminal.com/tools/box-api.md) | B | 69.4 | Agents working inside an enterprise's existing Box content with admin oversight, Box AI extraction and audit needs. | Your plan | hosted |
| 8 | [Dropbox API + MCP](https://www.anchorterminal.com/tools/dropbox-api.md) | B | 68.2 | An agent acting on a person's or team's existing Dropbox files, especially a solo user on the free plan. | Your plan | hosted |
| 9 | [OneDrive and SharePoint files (Microsoft Graph)](https://www.anchorterminal.com/tools/onedrive-sharepoint.md) | B | 65.3 | Agents working on files that already live in a Microsoft 365 tenant or a personal OneDrive, where sharing has to follow the tenant's own policy. | Your plan | hosted |
| 10 | [DigitalOcean Spaces](https://www.anchorterminal.com/tools/digitalocean-spaces.md) | B | 63.2 | Teams already on DigitalOcean that want object storage with a CDN and a flat $5 entry price for up to 250 GiB, with free transfer to Droplets in the same region. | $5 / mo | hosted |

## Picks by need

- Highest score overall: [Google Drive API + MCP](https://www.anchorterminal.com/tools/google-drive-api.md), A, 79.6/100 on the benchmark. Also [Amazon S3](https://www.anchorterminal.com/tools/amazon-s3.md), BB, 77.9/100.
- Schema & documentation: [Amazon S3](https://www.anchorterminal.com/tools/amazon-s3.md), 92/100 on schema & documentation, against 83 for the overall leader.
- Agent ergonomics: [Cloudflare R2](https://www.anchorterminal.com/tools/cloudflare-r2.md), 90/100 on agent ergonomics, against 85 for the overall leader.
- Maintenance & community: [Supabase API + MCP](https://www.anchorterminal.com/tools/supabase-mcp.md), 90/100 on maintenance & community, against 85 for the overall leader.
- Transparency & trust: [Supabase API + MCP](https://www.anchorterminal.com/tools/supabase-mcp.md), 90/100 on transparency & trust, against 75 for the overall leader.
- Lowest paid price per GB: [Bunny Storage](https://www.anchorterminal.com/tools/bunny-storage.md), $0.005 per GB, the lowest of the 6 listings here with a paid price in this unit (free allowances aside). Also [Cloudflare R2](https://www.anchorterminal.com/tools/cloudflare-r2.md), $0.01 per GB.
- Self-hosting under an open licence: [Supabase API + MCP](https://www.anchorterminal.com/tools/supabase-mcp.md), self-hosted, Apache-2 licence. Also [Backblaze B2](https://www.anchorterminal.com/tools/backblaze-b2.md), self-hosted, MIT licence.
- The review panel's favourite: [Backblaze B2](https://www.anchorterminal.com/tools/backblaze-b2.md), 3.8/5 from 8 panel reviews.

## How to choose

- Egress fees on downloads: Estimate the egress charge for the downloads the agent will make, because storage that is cheap to keep can cost more once files are read back out.
- Expiring share link behaviour: Test that a share link stops working at its expiry time, since an agent that sends a link to someone else depends on the expiry being enforced.
- Access controls and deletion: Check who can delete or list files under each credential, because an agent given write access to a bucket can remove files it was never meant to touch.
- Jurisdiction and legal entity: Read which legal entity and jurisdiction hold the stored files, since the location of the data can shape which rules apply to what the agent uploads.

- How the benchmark tests this category: An agent uploads a large file, lists a folder, shares a link that expires and deletes the file. We check the upload path, access controls, link expiry, and the storage and egress costs.

Each listing's verdict, strengths and weaknesses: https://www.anchorterminal.com/best/file-storage/index.md