# Fastio vs Google Cloud Storage

> Google Cloud Storage scores 76.7 (BB) to Fastio's 55.8 (C) for file sharing. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/fast-io-vs-google-cloud-storage
- Markdown: https://www.anchorterminal.com/compare/fast-io-vs-google-cloud-storage.md (~5,000 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Google Cloud Storage scores 76.7 (BB) on agent readiness against Fastio's 55.8 (C), and leads in 6 of 7 scored categories. Both do file sharing.

- Fastio: grade C, 55.8/100, rank #851 of 1486. Markdown https://www.anchorterminal.com/tools/fast-io.md · JSON https://www.anchorterminal.com/api/v1/tools/fast-io.json
- Google Cloud Storage: grade BB, 76.7/100, rank #41 of 1486. Markdown https://www.anchorterminal.com/tools/google-cloud-storage.md · JSON https://www.anchorterminal.com/api/v1/tools/google-cloud-storage.json
- Best file storage and sharing APIs for AI agents: https://www.anchorterminal.com/best/file-storage/index.md
- All 104 storage comparisons: https://www.anchorterminal.com/compare/file-storage/index.md

## Which one, for what

### 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

### Google Cloud Storage (BB)

Good for: Agents on Google Cloud that store and share files and datasets. amazon-s3, azure-blob-storage and cloudflare-r2 are the closest listings; teams outside Google Cloud with S3 tooling may prefer S3-compatible stores.

Ahead on:
- Reliability, 80 against 32
- Schema & documentation, 81 against 65
- Agent ergonomics, 85 against 73
- Security & auth, 85 against 77
- Maintenance & community, 88 against 70
- Transparency & trust, 85 against 64

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: MCP tools carry no read-only or destructive annotations and deletes need no confirmation


## Why the edge

### Reliability: Google Cloud Storage +48

- Fastio (32): fast.io, docs.fast.io, api.fast.io and mcp.fast.io weren't re-read on 4 November, because the terms of 2 October 2026 bar any robot from any portion of the Services, website included, outside the API and MCP access of Section 12. Per the 9 October check, no status page or incident history was found on fast.io, the docs or the Trust Centre (0 + 5 for no readable history). Rate limits are exposed in `x-ve-limit-avail`, `x-ve-limit-max` and `x-ve-limit-expires` headers, with no published numbers (5). 429 handling is documented with `Retry-After`, backoff, a retryable 503 and `if_version_id` compare-and-swap on uploads. Idempotency keys exist only on bug reports, not on file, share or workspace writes, so this is safe-retry guidance without idempotency keys on the product's writes (12, corrected on 4 November from 13, which isn't a value the line allows). No SLA, and Section 12 of the terms, re-read on 4 November, still gives no guarantee of API availability (0). The API and MCP server are sold as generally available (10). An earlier reading of the API's own status endpoint is struck, since it came from a request to the product.
- Google Cloud Storage (80): Google Cloud's status dashboard with a per-product incident feed (20). In the 90 days from 8 August, Cloud Storage appears in a high-severity incident on 20 August across 27 products (about 3 hours 40 minutes of timeouts and errors), a medium incident on 8 to 9 October with elevated upload and write errors, and a medium regional incident in europe-west2 on 20 October. One major outage (10). The request-rate guide gives numbers, no ramp-up needed below 1,000 writes or 5,000 reads a second per bucket, with gradual ramping above (15). The retry strategy page lists retryable responses, idempotent operations and preconditions that make writes safe to retry, and the client libraries back off exponentially (15). SLA with monthly uptime of 99.95 per cent for multi-region Standard and 99.9 per cent regional (10). Generally available, and the MCP server since 20 April 2026 (10). 20 + 10 + 15 + 15 + 10 + 10 = 80.

### Transparency & trust: Google Cloud Storage +21

- Fastio (64): Closed service under clear terms dated 2 October 2026, re-read on 4 November and unchanged in date. The CLI is Apache-2.0 (18). Per the 9 October check, not re-read on 4 November, a privacy policy, a published DPA and a deletion policy with matching periods of 15, 30, 60 and 90 days, and a no-training statement. The DPA binds only once signed (26). Deprecations are flagged in the docs (Basic sign-in, QuickShare, 410 Gone for retired paths) without dates, and the terms disclaim backward compatibility (6). Sub-processor list with purposes and locations, and 15 days' notice of additions (20).
- Google Cloud Storage (85): Closed service under the Google Cloud terms; client libraries are Apache-2.0 (18). Google's privacy policy, the Cloud Data Processing Addendum and a sub-processor list last modified 19 October 2026 apply, per the Secret Manager listing's 1 November check (22). Dated notices in release notes and a deprecated read_text MCP tool that names its replacement; Google Cloud's deprecation policy wasn't re-read today (15). Sub-processors are listed with locations, and each bucket is created in a chosen location (18). 18 + 22 + 15 + 18 = 73.

### Maintenance & community: Google Cloud Storage +18

- Fastio (70): CLI v0.2.98 on 29 October 2026 adds comment threads, suggestions and export (30). v0.2.99 on 2 November only updates dependencies, so it can't set recency. 18 CLI tags between 1 September and 2 November 2026, all inside the 90 days from 6 August, most of them changing code (20). No changelog in the CLI repository, and fast.io wasn't re-read. Support runs through a contact page, Discord and a bug-report endpoint, and the CLI repository had no open issues and one star, per the 9 October check (7). The official CLI is current, there are no SDKs, and a search of the MCP registry for fastio and fast.io returned nothing, per the 9 October check (5). CI runs check, format, clippy, the test suite and a release build, and Cargo.lock is committed and was updated on 2 November (8).
- Google Cloud Storage (88): Release notes on 4 November 2026 (30). Entries on 30 October, 13 October, 30 September, 10 September and 3 September (20). A closed service with dated release notes and paid support; issue trackers for the client libraries are public (15). Official client libraries in many languages (15). Libraries ship with end-to-end checksums by default since 30 September (8). 30 + 20 + 15 + 15 + 8 = 88.

### Schema & documentation: Google Cloud Storage +16

- Fastio (65): Per the 9 October check, not re-read on 4 November (terms ban on robots). No OpenAPI file. `OPTIONS` introspection returns parameter types and constraints on about 40 per cent of endpoints, and MCP tools answer `action="describe"`. The hosted tool definitions were not read, because mcp.fast.io's robots.txt disallows `/mcp` (10). llms.txt on fast.io and api.fast.io, a Markdown twin for each reference section, agents.md and skill.md (10). Descriptions say when to use each tool and name the traps (17). Constraint tables and enums are documented, but MCP inputs route through one `action` parameter (9). Request and response examples and per-endpoint error tables (13). The API is version 1.0 under `/current/`, guides carry version numbers and dates, and no changelog was found, in the docs then or in the CLI repository on 4 November (6).
- Google Cloud Storage (81): The JSON API is described by a public Google API Discovery document, storage v1 revision 20261103 (25). docs.cloud.google.com/llms.txt and /storage/llms.txt return 404 (0). The reference explains each method and the docs say when to use XML, JSON or gRPC and that gsutil is legacy (14). Typed resources with enums for storage classes and predefined ACLs (14). Samples in every client library and an error reference with HTTP codes and reasons (13). API version v1 and dated release notes, the latest on 4 November 2026 (15). 25 + 0 + 14 + 14 + 13 + 15 = 81.

### Agent ergonomics: Google Cloud Storage +12

- Fastio (73): Per the 9 October check, not re-read on 4 November (terms ban on robots). 35 hosted tools in named mode, 39 with import and signing (5). Added back 10 for the 8-tool code mode, read-only sessions that list no write tools and the CLI's `--tools` filter (15). Offset and cursor pagination, `page_size` of 100 to 500, filters and `output=terse` or `markdown` (20). Errors carry an HTTP status, a code, per-parameter messages and a recovery hint (18). The docs say every hosted tool sets readOnlyHint, destructiveHint and idempotentHint, and uploads accept `if_version_id`. No general idempotency key (14). No SDK in any language, only the CLI, and workspace creation needs four required fields with literal permission strings (6). The CLI's own stdio server, read from its source at v0.2.99 on 4 November, lists 26 action-routed tools (`import` only when cloud import is on) and sets no annotations.
- Google Cloud Storage (85): Graded as an API with a nine-tool MCP server. The fields parameter selects partial responses, and Range reads fetch part of an object (22). maxResults and pageToken paging, prefix and delimiter filters and match globs (20). JSON errors with code, message and reason, and a documented retry table (16). Generation and metageneration preconditions make retries safe; the MCP reference gives no read-only or destructive annotations (14). Client libraries in many languages with retries on by default, but every call needs Google auth and a project (13). 22 + 20 + 16 + 14 + 13 = 85.

### Security & auth: Google Cloud Storage +8

- Fastio (77): OAuth 2.0 with PKCE (S256), dynamic client registration and consent to scopes, or revocable API keys scoped by entity and access mode with optional expiry, per the 9 October check (30). Read-only scopes, read and write tools kept apart, and `confirm='true'` on irreversible actions (18). Stored files are untrusted content. The docs flag intent text as untrusted and say AI works within the caller's permissions, with no wider guidance (6). An activity log on every plan, kept 30 to 365 days, with an actor on each record. CSV export and SIEM streaming are Enterprise only (13). security@fast.io and the CLI's SECURITY.md, which promises acknowledgement within 48 hours and a fix within 7 days for critical issues, plus Google CASA Assurance Level 1 per the 9 October Trust Centre reading. No SOC 2 report, no bug bounty and no security.txt (10, corrected from 7, since SECURITY.md has stated the 48-hour acknowledgement since 1 September 2026).
- Google Cloud Storage (85): IAM roles on project, bucket and managed folder, V4 signed URLs, and an IAM permission per MCP method (mcp.tools.call plus the storage permission, such as storage.objects.delete for delete_object) (30). Read-only roles such as Storage Object Viewer, grantable down to a managed folder, soft delete with a pausable hard-deletion window and retention locks, but no confirmation step on delete_bucket or delete_object (17). read_object returns stored content to the model with no untrusted-content guidance on the MCP page (5). Cloud Audit Logs with Admin Activity and Data Access entries (15). google.com security.txt is valid to 2030-04-01 with a VRP policy link, per the Secret Manager listing's 1 November check, and Google Cloud publishes security bulletins; Cloud Storage's place in the SOC 2 scope wasn't read today (18). 30 + 17 + 5 + 15 + 18 = 85.

## Score by category

| Category | Weight | Fastio | Google Cloud Storage | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 32 | 80 | Google Cloud Storage +48 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 65 | 81 | Google Cloud Storage +16 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 85 | Google Cloud Storage +12 |
| Security & auth | 14% (17.5 this run) | 77 | 85 | Google Cloud Storage +8 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 70 | 88 | Google Cloud Storage +18 |
| Transparency & trust | 7% (8.8 this run) | 64 | 85 | Google Cloud Storage +21 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **55.8 · C** | **76.7 · BB** | |

## Facts side by side

| Fact | Fastio | Google Cloud Storage |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | VividEngine, LLC | Google Cloud |
| Hosted endpoint | `https://mcp.fast.io/mcp/tools` | `https://storage.googleapis.com/storage/mcp` |
| Transports | HTTP, Streamable HTTP, stdio | Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | Proprietary service under Fast's terms of service. The CLI, which includes a local MCP server, is Apache-2.0 | none |
| Tools exposed | 35 | 9 |
| Read-only variant documented | yes | no |
| llms.txt | yes | no |
| Last release | 2026-11-02 | 2026-11-04 |
| Terms last updated | 2026-10-02 | 2026-09-02 |
| Privacy policy last updated | 2026-10-02 | 2026-10-01 |
| Customer content may train models | not found in the text | yes |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 1 stars, 653 npm/wk | none |

## How the scores have moved

### Fastio

- +0.3 on 4 November 2026: correction
- +0.3 on 27 October 2026: checklist

### Google Cloud Storage

No score change since it was listed.

## Verdicts

**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.

**Google Cloud Storage.** IAM per bucket and MCP method, signed URLs, preconditions for safe retries and a 99.95 per cent multi-region SLA make it a well-governed object store for agents. The nine-tool MCP server has no read-only or destructive annotations, reads stop at 8 MiB, and a person must set up a project and billing first.

## Before you call either

### 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

### Google Cloud Storage

1. Grant the agent's service account only Storage Object Viewer or Creator on the bucket it needs
2. Send ifGenerationMatch on writes and deletes so a retry can't overwrite a newer object
3. Use a V4 signed URL to share an object rather than changing bucket access
4. Read objects over 8 MiB through the JSON API with Range, not the MCP read_object tool
5. Confirm with the user before delete_bucket or delete_object

## Questions

### Which is better for AI agents, Fastio or Google Cloud Storage?

Google Cloud Storage scores 76.7 (BB) on agent readiness against Fastio's 55.8 (C), and leads in 6 of 7 scored categories.

### Do Fastio and Google Cloud Storage need an API key?

Fastio takes an API key or an OAuth sign-in. Google Cloud Storage uses an OAuth sign-in.

### Can an agent call Fastio and Google Cloud Storage without installing anything?

Yes. Fastio has a hosted endpoint at https://mcp.fast.io/mcp/tools and Google Cloud Storage at https://storage.googleapis.com/storage/mcp.


## For agents

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

## Other comparisons with Fastio or Google Cloud Storage

- [Amazon S3 vs Fastio](https://www.anchorterminal.com/compare/amazon-s3-vs-fast-io.md)
- [Azure Blob Storage vs Fastio](https://www.anchorterminal.com/compare/azure-blob-storage-vs-fast-io.md)
- [Backblaze B2 vs Fastio](https://www.anchorterminal.com/compare/backblaze-b2-vs-fast-io.md)
- [Box API + MCP vs Google Cloud Storage](https://www.anchorterminal.com/compare/box-api-vs-google-cloud-storage.md)
- [Cloudflare R2 vs Fastio](https://www.anchorterminal.com/compare/cloudflare-r2-vs-fast-io.md)
- [DigitalOcean Spaces vs Fastio](https://www.anchorterminal.com/compare/digitalocean-spaces-vs-fast-io.md)
- [Dropbox API + MCP vs Google Cloud Storage](https://www.anchorterminal.com/compare/dropbox-api-vs-google-cloud-storage.md)
- [Fastio vs Tigris](https://www.anchorterminal.com/compare/fast-io-vs-tigris.md)
- [Google Cloud Storage vs Google Drive API + MCP](https://www.anchorterminal.com/compare/google-cloud-storage-vs-google-drive-api.md)
- [Google Cloud Storage vs ONLYOFFICE Apps MCP Server](https://www.anchorterminal.com/compare/google-cloud-storage-vs-onlyoffice-mcp.md)
- [Amazon S3 vs Google Cloud Storage](https://www.anchorterminal.com/compare/amazon-s3-vs-google-cloud-storage.md)
- [Azure Blob Storage vs Google Cloud Storage](https://www.anchorterminal.com/compare/azure-blob-storage-vs-google-cloud-storage.md)
- [Backblaze B2 vs Google Cloud Storage](https://www.anchorterminal.com/compare/backblaze-b2-vs-google-cloud-storage.md)
- [Bunny Storage vs Google Cloud Storage](https://www.anchorterminal.com/compare/bunny-storage-vs-google-cloud-storage.md)
- [Cloudflare R2 vs Google Cloud Storage](https://www.anchorterminal.com/compare/cloudflare-r2-vs-google-cloud-storage.md)
- [DigitalOcean Spaces vs Google Cloud Storage](https://www.anchorterminal.com/compare/digitalocean-spaces-vs-google-cloud-storage.md)
- [Google Cloud Storage vs Tigris](https://www.anchorterminal.com/compare/google-cloud-storage-vs-tigris.md)
- [Google Cloud Storage vs Wasabi Hot Cloud Storage](https://www.anchorterminal.com/compare/google-cloud-storage-vs-wasabi-hot-cloud-storage.md)
- [Box API + MCP vs Fastio](https://www.anchorterminal.com/compare/box-api-vs-fast-io.md)
- [Dropbox API + MCP vs Fastio](https://www.anchorterminal.com/compare/dropbox-api-vs-fast-io.md)
- [Fastio vs Google Drive API + MCP](https://www.anchorterminal.com/compare/fast-io-vs-google-drive-api.md)
- [Fastio vs OneDrive and SharePoint files (Microsoft Graph)](https://www.anchorterminal.com/compare/fast-io-vs-onedrive-sharepoint.md)
- [Fastio vs ONLYOFFICE Apps MCP Server](https://www.anchorterminal.com/compare/fast-io-vs-onlyoffice-mcp.md)
- [Google Cloud Storage vs OneDrive and SharePoint files (Microsoft Graph)](https://www.anchorterminal.com/compare/google-cloud-storage-vs-onedrive-sharepoint.md)

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