# Dropbox API + MCP vs Fastio

> Dropbox scores 68.2 (B) to Fastio's 55.2 (C) for file drives. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io
- Markdown: https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io.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: 2026-10-09

Dropbox API + MCP scores 68.2 (B) on agent readiness against Fastio's 55.2 (C), and leads in 6 of 7 scored categories. Both do file drives.

- Dropbox API + MCP: grade B, 68.2/100, rank #226 of 950. Markdown https://www.anchorterminal.com/tools/dropbox-api.md · JSON https://www.anchorterminal.com/api/v1/tools/dropbox-api.json
- Fastio: grade C, 55.2/100, rank #663 of 950. Markdown https://www.anchorterminal.com/tools/fast-io.md · JSON https://www.anchorterminal.com/api/v1/tools/fast-io.json
- Best file storage and sharing APIs for AI agents: https://www.anchorterminal.com/best/file-storage/index.md
- All 75 storage comparisons: https://www.anchorterminal.com/compare/file-storage/index.md

## Which one, for what

### Dropbox API + MCP (B)

Good for: An agent acting on a person's or team's existing Dropbox files, especially a solo user on the free plan.

Ahead on:
- Reliability, 52 against 33
- Schema & documentation, 91 against 65
- Payments & pricing, 35 against 30
- Maintenance & community, 90 against 70

Watch for: MCP server is beta, extracts at most 5 MB per file and can be blocked by team admins

### Fastio (C)

Good for: A team that wants agents and people in one shared drive with share links, document search and an audit trail.

Also in its favour:
- Runs on your own machine

Watch for: No free tier. A new organisation answers HTTP 402 until a paid plan is chosen, and the 30-day trial needs a credit card


## Score by category

| Category | Weight | Dropbox API + MCP | Fastio | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 52 | 33 | Dropbox API + MCP +19 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 91 | 65 | Dropbox API + MCP +26 |
| Agent ergonomics | 13% (16.2 this run) | 77 | 73 | Dropbox API + MCP +4 |
| Security & auth | 14% (17.5 this run) | 73 | 74 | Fastio +1 |
| Payments & pricing | 10% (12.5 this run) | 35 | 30 | Dropbox API + MCP +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 90 | 70 | Dropbox API + MCP +20 |
| Transparency & trust | 7% (8.8 this run) | 62 | 61 | Dropbox API + MCP +1 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **68.2 · B** | **55.2 · C** | |

## Facts side by side

| Fact | Dropbox API + MCP | Fastio |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Dropbox | VividEngine, LLC |
| Hosted endpoint | `https://api.dropboxapi.com/2` | `https://mcp.fast.io/mcp/tools` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth | OAuth or key |
| Pricing | Your plan | Paid |
| x402 | no | no |
| Licence | MIT | Proprietary service under Fast's terms of service. The CLI, which includes a local MCP server, is Apache-2.0 |
| Tools exposed | 25 | 35 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | 2026-10-01 | 2026-10-08 |
| Terms last updated | 2025-03-01 | 2026-10-02 |
| Privacy policy last updated | 2027-01-01 | 2026-10-02 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 980 stars, 282k npm/wk, 398k PyPI/wk | 1 stars, 653 npm/wk |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Dropbox API + MCP.** 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.

**Fastio.** OAuth with PKCE, scoped API keys with read, write and admin modes, and separate read and write MCP tools limit what an agent can touch. There is no free tier, the 30-day trial needs a card, and no status page, SLA, OpenAPI file or public changelog was found.

## Before you call either

### Dropbox API + MCP

1. Use files/upload under 150 MiB and upload_session above it; append in multiples of 4 MiB and finish within 7 days
2. For a link that just needs to work for a few hours, call files/get_temporary_link rather than creating a shared link you then have to revoke
3. Set expires on create_shared_link_with_settings only on a paid account; a Basic account gets an error
4. Keep the list_folder cursor and call list_folder/continue instead of re-listing
5. On a rate-limit error wait retry_after seconds; too_many_write_operations means write contention, so serialise writes

### Fastio

1. Connect to `https://mcp.fast.io/mcp/tools` for named tools or `https://mcp.fast.io/mcp/code` for the 8-tool code mode. The URL fixes the tool set for the session
2. Call `action="describe"` on a tool before first use. Parameters live there, not in the tool list
3. To update a file, upload again with the same parent folder and filename. Deleting first loses the version history
4. On 429 wait until `x-ve-limit-expires` or the `Retry-After` value. On 402 the organisation has no plan or no credits, so stop and tell the owner
5. Ask the owner for a key scoped to one workspace with `r` or `rw`. A key made without scopes carries `user:*:rw` across the account

## Questions

### Which is better for AI agents, Dropbox API + MCP or Fastio?

Dropbox API + MCP scores 68.2 (B) on agent readiness against Fastio's 55.2 (C), and leads in 6 of 7 scored categories.

### Do Dropbox API + MCP and Fastio need an API key?

Dropbox API + MCP uses an OAuth sign-in. Fastio takes an API key or an OAuth sign-in.

### Can an agent call Dropbox API + MCP and Fastio without installing anything?

Yes. Dropbox API + MCP has a hosted endpoint at https://api.dropboxapi.com/2 and Fastio at https://mcp.fast.io/mcp/tools.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io.json, and with the fewest tokens: https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "dropbox-api", "b": "fast-io"}`. From a terminal: `anchor compare dropbox-api fast-io`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/dropbox-api.json and https://www.anchorterminal.com/api/v1/tools/fast-io.json

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