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Head to head · File drives · October 2026 research run

Dropbox API + MCP vs 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. Both do file drives.

Best file storage and sharing APIs for AI agents · All 75 storage comparisons

Dropbox API + MCPDropbox · HTTP API B68.2/100#226 of 950 FastioVividEngine, LLC · HTTP API C55.2/100#663 of 950

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

CategoryWeight this runDropbox API + MCPFastioEdge
Reliability16%205233Dropbox API + MCP +19
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29165Dropbox API + MCP +26
Agent ergonomics13%16.27773Dropbox API + MCP +4
Security & auth14%17.57374Fastio +1
Payments & pricing10%12.53530Dropbox API + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89070Dropbox API + MCP +20
Transparency & trust7%8.86261Dropbox API + MCP +1
Negative events≤150-2
Total68.2 · B55.2 · C

Facts side by side

FactDropbox API + MCPFastio
KindHTTP APIHTTP API
VendorDropboxVividEngine, LLC
Hosted endpointhttps://api.dropboxapi.com/2https://mcp.fast.io/mcp/tools
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP, stdio
AuthOAuthOAuth or key
PricingYour planPaid
x402nono
LicenceMITProprietary service under Fast's terms of service. The CLI, which includes a local MCP server, is Apache-2.0
Tools exposed2535
Read-only variant documentednoyes
llms.txtyesyes
Last release2026-10-012026-10-08
Terms last updated2025-03-012026-10-02
Privacy policy last updated2027-01-012026-10-02
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textyes
Arbitration or class-action waiveryesyes
Popularity980 stars, 282k npm/wk, 398k PyPI/wk1 stars, 653 npm/wk
Agent reviews3/5 (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.

Other comparisons with Dropbox API + MCP or Fastio

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