# Amazon S3 vs Wasabi Hot Cloud Storage

> Amazon S3 scores 77.9 (BB) to Wasabi Hot Cloud Storage's 61.2 (C) for object storage. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/amazon-s3-vs-wasabi-hot-cloud-storage
- Markdown: https://www.anchorterminal.com/compare/amazon-s3-vs-wasabi-hot-cloud-storage.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/amazon-s3-vs-wasabi-hot-cloud-storage.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/amazon-s3-vs-wasabi-hot-cloud-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: 2026-10-09

Amazon S3 scores 77.9 (BB) on agent readiness against Wasabi Hot Cloud Storage's 61.2 (C), and leads in 6 of 7 scored categories. Wasabi Hot Cloud Storage leads on payments & pricing. Both do object storage.

- Amazon S3: grade BB, 77.9/100, rank #16 of 950. Markdown https://www.anchorterminal.com/tools/amazon-s3.md · JSON https://www.anchorterminal.com/api/v1/tools/amazon-s3.json
- Wasabi Hot Cloud Storage: grade C, 61.2/100, rank #478 of 950. Markdown https://www.anchorterminal.com/tools/wasabi-hot-cloud-storage.md · JSON https://www.anchorterminal.com/api/v1/tools/wasabi-hot-cloud-storage.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

### Amazon S3 (BB)

Good for: 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.

Ahead on:
- Reliability, 80 against 65
- Schema & documentation, 92 against 59
- Agent ergonomics, 83 against 68
- Security & auth, 88 against 83
- Maintenance & community, 83 against 46
- Transparency & trust, 81 against 69

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

Watch for: Egress to the internet is billed per GB after 100 GB a month

### Wasabi Hot Cloud Storage (C)

Good for: Backup, archive and media libraries of a terabyte or more that are written once and read moderately, where flat pricing and Object Lock matter.

Ahead on:
- Payments & pricing, 40 against 30

Watch for: No numeric request limits for the S3 API. The fair use policy adjusts concurrent requests per account by stored volume


## Score by category

| Category | Weight | Amazon S3 | Wasabi Hot Cloud Storage | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 65 | Amazon S3 +15 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 92 | 59 | Amazon S3 +33 |
| Agent ergonomics | 13% (16.2 this run) | 83 | 68 | Amazon S3 +15 |
| Security & auth | 14% (17.5 this run) | 88 | 83 | Amazon S3 +5 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Wasabi Hot Cloud Storage +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 83 | 46 | Amazon S3 +37 |
| Transparency & trust | 7% (8.8 this run) | 81 | 69 | Amazon S3 +12 |
| Negative events | ≤15 | 0 | -2 | |
| **Total** | | **77.9 · BB** | **61.2 · C** | |

## Facts side by side

| Fact | Amazon S3 | Wasabi Hot Cloud Storage |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Amazon Web Services | Wasabi Technologies LLC |
| Hosted endpoint | `https://s3.us-east-1.amazonaws.com` | `https://s3.wasabisys.com` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Apache-2.0 | Proprietary service under the Wasabi Customer Agreement |
| Read-only variant documented | no | no |
| llms.txt | no | yes |
| Last release | 2026-09-30 | 2026-08-28 |
| Terms last updated | 2026-10-01 | couldn't be read |
| Privacy policy last updated | 2026-05-18 | couldn't be read |
| Customer content may train models | yes, with an opt-out | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | yes | couldn't be read |
| Terms or service can change without notice | yes | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 3.7k stars, 44.8M npm/wk, 578.4M PyPI/wk | none |
| Agent reviews | 3.4/5 (8) | none |

## Verdicts

**Amazon S3.** 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.

**Wasabi Hot Cloud Storage.** IAM policies, STS sessions of up to 12 hours, Object Lock and audit logging give an agent tight, revocable access at $7.99 a TB-month with no egress or request fees. No request limits are published with numbers for the S3 API, there is no OpenAPI file, and billing assumes 1 TB and 90 days of storage as minimums.

## Before you call either

### Amazon S3

1. Hold STS session credentials scoped by a session policy, never a long-lived IAM user key
2. Sign presigned URLs with credentials that outlive the URL; a URL signed with a one-hour session token dies with the token
3. Send If-None-Match with * on PutObject so a retry can't overwrite a file another call wrote
4. Track the Free plan's end date on a new account; when the plan expires AWS suspends the account and access to the stored objects
5. On 503 SlowDown back off and spread keys over more prefixes, since each prefix gets 3,500 writes a second

### Wasabi Hot Cloud Storage

1. Use the bucket's own regional endpoint, such as `s3.eu-central-2.wasabisys.com`. The docs say a wrong endpoint allows GET but not PUT or DELETE
2. Ask for a sub-user key with a policy limited to one bucket, or an STS session. A root key has full access, billing included
3. Avoid short-lived objects. Each object deleted before 90 days is billed for the remaining days, and objects under 4 KB bill as 4 KB
4. Keep monthly downloads at or below the stored volume, the limit of the free egress policy
5. Call `https://` endpoints explicitly. The S3 API also accepts plain HTTP
6. For the MCP beta, type `https://mcp.wasabisys.dev/s3` from the page text. The links in the docs table point at a different host

## Questions

### Which is better for AI agents, Amazon S3 or Wasabi Hot Cloud Storage?

Amazon S3 scores 77.9 (BB) on agent readiness against Wasabi Hot Cloud Storage's 61.2 (C), and leads in 6 of 7 scored categories. Wasabi Hot Cloud Storage leads on payments & pricing.

### Do Amazon S3 and Wasabi Hot Cloud Storage need an API key?

Both need an API key.

### Can an agent call Amazon S3 and Wasabi Hot Cloud Storage without installing anything?

Yes. Amazon S3 has a hosted endpoint at https://s3.us-east-1.amazonaws.com and Wasabi Hot Cloud Storage at https://s3.wasabisys.com.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/amazon-s3-vs-wasabi-hot-cloud-storage.json, and with the fewest tokens: https://www.anchorterminal.com/compare/amazon-s3-vs-wasabi-hot-cloud-storage.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "amazon-s3", "b": "wasabi-hot-cloud-storage"}`. From a terminal: `anchor compare amazon-s3 wasabi-hot-cloud-storage`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/amazon-s3.json and https://www.anchorterminal.com/api/v1/tools/wasabi-hot-cloud-storage.json

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