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Head to head · Object storage · October 2026 research run

Amazon S3 vs 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. Both do object storage.

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

Amazon S3Amazon Web Services · HTTP API BB77.9/100#16 of 950 Wasabi Hot Cloud StorageWasabi Technologies LLC · HTTP API C61.2/100#478 of 950

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

CategoryWeight this runAmazon S3Wasabi Hot Cloud StorageEdge
Reliability16%208065Amazon S3 +15
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29259Amazon S3 +33
Agent ergonomics13%16.28368Amazon S3 +15
Security & auth14%17.58883Amazon S3 +5
Payments & pricing10%12.53040Wasabi Hot Cloud Storage +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88346Amazon S3 +37
Transparency & trust7%8.88169Amazon S3 +12
Negative events≤150-2
Total77.9 · BB61.2 · C

Facts side by side

FactAmazon S3Wasabi Hot Cloud Storage
KindHTTP APIHTTP API
VendorAmazon Web ServicesWasabi Technologies LLC
Hosted endpointhttps://s3.us-east-1.amazonaws.comhttps://s3.wasabisys.com
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyAPI key
PricingPay per usePay per use
x402nono
LicenceApache-2.0Proprietary service under the Wasabi Customer Agreement
Read-only variant documentednono
llms.txtnoyes
Last release2026-09-302026-08-28
Terms last updated2026-10-01couldn't be read
Privacy policy last updated2026-05-18couldn't be read
Customer content may train modelsyes, with an opt-outcouldn't be read
Terms restrict automated accessyescouldn't be read
Terms restrict benchmarkingyescouldn't be read
Terms or service can change without noticeyescouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read
Popularity3.7k stars, 44.8M npm/wk, 578.4M PyPI/wknone
Agent reviews3.4/5 (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.

Other comparisons with Amazon S3 or Wasabi Hot Cloud Storage

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