# File storage and sharing APIs for AI agents

> 9 file storage & sharing listings ranked by the Anchor benchmark. Leader Amazon S3 (A). Object storage and file services an agent can put files in and share them from: S3-compatible buckets, and drives with folders, permissions and share links. Compared on price per gigabyte, egress fees, access controls and S3 compatibility.

- Canonical: https://www.anchorterminal.com/categories/file-storage
- Markdown: https://www.anchorterminal.com/categories/file-storage.md (~2,750 tokens)
- Slim: https://www.anchorterminal.com/categories/file-storage.min.md (~480 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/categories/file-storage.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Object storage and file services an agent can put files in and share them from: S3-compatible buckets, and drives with folders, permissions and share links. Compared on price per gigabyte, egress fees, access controls and S3 compatibility.

- Tools ranked: 9 · agent-ready (BB or better): 5 · accept x402: 0 · hosted endpoints: 9 · desk reviews by the panel: 48
- JSON: https://www.anchorterminal.com/api/v1/tools.json (list) · https://www.anchorterminal.com/api/v1/rankings.json (ranked) · https://www.anchorterminal.com/api/v1/x402.json (payable) · https://www.anchorterminal.com/api/v1/capabilities.json (by capability)
- Grades run AA, A, BB, B, C, D, E, F · methodology: https://www.anchorterminal.com/benchmark/

- Capabilities in this category: storage.object, storage.s3, storage.share, storage.drive, storage.presigned
- https://letme.dev/storage.object picks the top-graded tool in this list and says how to call it direct; calling through letme comes later (https://www.anchorterminal.com/letme/index.md)

## Ranking

| # | Tool | Vendor | Kind | Category | Grade | Score | Confidence | x402 | Auth | Where | Reviews | Page |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 9 | Amazon S3 | Amazon Web Services | HTTP API | Storage | A | 79.3 | medium | no | API key | hosted | 3.4/5 (8) | https://www.anchorterminal.com/tools/amazon-s3.md |
| 12 | Google Drive API + MCP | Google | HTTP API | Storage | A | 78.6 | medium | no | OAuth | hosted | 3.4/5 (8) | https://www.anchorterminal.com/tools/google-drive-api.md |
| 14 | Cloudflare R2 | Cloudflare | HTTP API | Storage | A | 78.4 | medium | no | API key | hosted | 3.5/5 (8) | https://www.anchorterminal.com/tools/cloudflare-r2.md |
| 30 | Supabase API + MCP | Supabase | HTTP API | Databases | BB | 75.8 | medium | no | OAuth or key | hosted + local | 3.3/5 (8) | https://www.anchorterminal.com/tools/supabase-mcp.md |
| 35 | Backblaze B2 | Backblaze | HTTP API | Storage | BB | 75.4 | medium | no | API key | hosted + local | 3.8/5 (8) | https://www.anchorterminal.com/tools/backblaze-b2.md |
| 109 | Box API + MCP | Box | HTTP API | Storage | B | 69.6 | medium | no | OAuth | hosted | 2.5/5 (2) | https://www.anchorterminal.com/tools/box-api.md |
| 129 | Dropbox API + MCP | Dropbox | HTTP API | Storage | B | 68.2 | medium | no | OAuth | hosted | 3/5 (2) | https://www.anchorterminal.com/tools/dropbox-api.md |
| 277 | Bunny Storage | bunny.net | HTTP API | Storage | C | 58.7 | medium | no | API key | hosted | 3/5 (2) | https://www.anchorterminal.com/tools/bunny-storage.md |
| 404 | Tigris | Tigris Data | HTTP API | Storage | E | 44.6 | medium | no | OAuth or key | hosted + local | 3/5 (2) | https://www.anchorterminal.com/tools/tigris.md |

Scores are from public evidence against the published checklist (https://www.anchorterminal.com/benchmark/), with Performance and Task success pending. p95 latency and context cost come from our probes, which haven't run yet.

## Summaries

### 9. Amazon S3, A (79.3)

AWS object storage for files, backups and application data, accessed through an API. STS session credentials with session policies, so an agent can hold one prefix for an hour. Egress to the internet is billed per GB after 100 GB a month.

- Page: https://www.anchorterminal.com/tools/amazon-s3 · Markdown: https://www.anchorterminal.com/tools/amazon-s3.md · JSON: https://www.anchorterminal.com/api/v1/tools/amazon-s3.json
- Capabilities: storage.object, storage.s3, storage.presigned, storage.share · endpoint: `https://s3.us-east-1.amazonaws.com`

### 12. Google Drive API + MCP, A (78.6)

REST API for a user's or a Workspace organisation's Drive, files, folders, permissions and share links, with resumable uploads and change feeds. No charge for API calls within quota, counted in quota units per minute per project and per user. OAuth consent, scope verification and a Cloud project before an agent can list a folder.

- Page: https://www.anchorterminal.com/tools/google-drive-api · Markdown: https://www.anchorterminal.com/tools/google-drive-api.md · JSON: https://www.anchorterminal.com/api/v1/tools/google-drive-api.json
- Capabilities: storage.drive, storage.share, work.docs · endpoint: `https://www.googleapis.com/drive/v3`

### 14. Cloudflare R2, A (78.4)

S3-compatible object storage with no egress fees. Free egress and a free tier of 10 GB-month plus 1 million writes a month. No versioning, tagging, ACLs or bucket policies on the S3 API; retention comes as bucket lock rules.

- Page: https://www.anchorterminal.com/tools/cloudflare-r2 · Markdown: https://www.anchorterminal.com/tools/cloudflare-r2.md · JSON: https://www.anchorterminal.com/api/v1/tools/cloudflare-r2.json
- Capabilities: storage.object, storage.s3, storage.presigned, storage.share · endpoint: `https://<account-id>.r2.cloudflarestorage.com`

### 30. Supabase API + MCP, BB (75.8)

Hosted Postgres with an auto-generated REST API (PostgREST), GraphQL, auth, storage, realtime and Edge Functions, plus a Management API and an official MCP server. OAuth 2.1 with dynamic client registration, plus personal access tokens scoped to chosen projects and permissions. Several multi-hour platform incidents between 27 August and 30 September.

- Page: https://www.anchorterminal.com/tools/supabase-mcp · Markdown: https://www.anchorterminal.com/tools/supabase-mcp.md · JSON: https://www.anchorterminal.com/api/v1/tools/supabase-mcp.json
- Capabilities: db.sql, db.admin, db.vector, db.hybrid, db.fulltext, db.filters · endpoint: `https://api.supabase.com/v1`

### 35. Backblaze B2, BB (75.4)

Object storage at $6.95 a TB-month with the first 10 GB free, egress free up to three times what you store and $0.01 a GB after, and no charge for most API calls. $6.95 a TB-month, first 10 GB free, Class A, B and C API calls free, and no card at signup. No rate limits published with numbers; the docs say only that B2 may throttle per account.

- Page: https://www.anchorterminal.com/tools/backblaze-b2 · Markdown: https://www.anchorterminal.com/tools/backblaze-b2.md · JSON: https://www.anchorterminal.com/api/v1/tools/backblaze-b2.json
- Capabilities: storage.object, storage.s3, storage.presigned, storage.share · endpoint: `https://s3.us-west-004.backblazeb2.com`

### 109. Box API + MCP, B (69.6)

Enterprise content platform with a REST API for files, folders, shared links, collaborations, metadata and Box AI, published as OpenAPI with year-based API versions. Public OpenAPI 3.0 spec with 297 operations, year-based API versions and an llms.txt of Markdown pages. 20 status-feed entries between 7 July and 1 October 2026, two of them over two hours on uploads or multiple services.

- Page: https://www.anchorterminal.com/tools/box-api · Markdown: https://www.anchorterminal.com/tools/box-api.md · JSON: https://www.anchorterminal.com/api/v1/tools/box-api.json
- Capabilities: storage.drive, storage.share, work.docs · endpoint: `https://api.box.com/2.0`

### 129. Dropbox API + MCP, B (68.2)

HTTP API v2 for a user's or team's Dropbox, files, folders, upload sessions to about 2 TiB, shared links with passwords and expiry, file requests and change cursors. Typed Stone spec of 281 routes with per-route OAuth scopes and error unions, updated 1 October 2026. MCP server is beta, extracts at most 5 MB per file and can be blocked by team admins.

- Page: https://www.anchorterminal.com/tools/dropbox-api · Markdown: https://www.anchorterminal.com/tools/dropbox-api.md · JSON: https://www.anchorterminal.com/api/v1/tools/dropbox-api.json
- Capabilities: storage.drive, storage.share · endpoint: `https://api.dropboxapi.com/2`

### 277. Bunny Storage, C (58.7)

Object storage replicated to up to 15 regions, fronted by Bunny CDN. $0.01 a GB-month for Standard storage, no request fees, free traffic to the CDN. Zone passwords are the only storage credential, read-write or read-only, with no expiry, prefix scope or usage log.

- Page: https://www.anchorterminal.com/tools/bunny-storage · Markdown: https://www.anchorterminal.com/tools/bunny-storage.md · JSON: https://www.anchorterminal.com/api/v1/tools/bunny-storage.json
- Capabilities: storage.object, storage.s3, storage.presigned · endpoint: `https://storage.bunnycdn.com`

### 404. Tigris, E (44.6)

S3-compatible object storage that replicates objects towards where they're read, with no egress fees and one global endpoint (t3.storage.dev). No egress fees, and one endpoint (t3.storage.dev) with region auto for every location. 16 status incidents between 4 July and 2 October 2026, including outages in US regions on 31 July and 2 August.

- Page: https://www.anchorterminal.com/tools/tigris · Markdown: https://www.anchorterminal.com/tools/tigris.md · JSON: https://www.anchorterminal.com/api/v1/tools/tigris.json
- Capabilities: storage.object, storage.s3, storage.presigned, storage.share · endpoint: `https://t3.storage.dev`

## How we test 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. This test hasn't run yet, so Task success is pending and the grades here come from the categories assessed from public evidence.

## Indexed, not reviewed (4)

Sorted into this category from public catalogues, with facts and our own checks but no score, grade or rank (https://www.anchorterminal.com/indexed/index.md).

| Listing | Kind | What it does | Why it's here |
| --- | --- | --- | --- |
| [DBConvert Streams (Federated SQL)](https://www.anchorterminal.com/tools/dbconvert-streams.md) | MCP server | Read-only SQL across your PostgreSQL, MySQL, S3 buckets and local data files, in one query. | vendor's own |
| [gk-cli](https://www.anchorterminal.com/tools/gitkraken-gk-cli.md) | MCP server | The GitKraken MCP Server for managing repos, PRs, issues across GitHub, GitLab, Bitbucket and more. | vendor's own, widely used |
| [mcp-upload](https://www.anchorterminal.com/tools/objekt-mcp-upload.md) | MCP server | Public file storage for AI agents. Upload files and get a permalink back. | vendor's own |
| [obsideo.io MCP server](https://www.anchorterminal.com/tools/obsideo-mcp.md) | MCP server | Encrypted S3-compatible storage with possession proofs you can verify yourself. 12 GB free. | vendor's own |