S3 Usage type descriptions

When you see S3 usage types in Cost Explorer without a region code prefix (like "Requests-Tier1" instead of "UGE1-Requests-Tier2"), this typically indicates that these are global usage types rather than region-specific ones.

In the context of S3 billing, "Global-Requests-Tier1" generally refers to PUT, COPY, POST, and LIST requests, while "Global-Requests-Tier2" typically refers to GET and all other requests. These global usage types are often associated with the AWS Free Tier offerings.

For example, the AWS Free Tier for S3 includes:

• 2,000 Requests for free for 12 months as part of AWS Free Usage Tier (Global-Requests-Tier1)
• 20,000 Requests for free for 12 months as part of AWS Free Usage Tier (Global-Requests-Tier2)

These free tier allocations reset monthly during your first 12 months.

Region-specific usage types (like "UGE1-Requests-Tier2") indicate usage in a particular AWS region, where the prefix represents the region code. These are used for standard billing outside of the free tier or for usage that exceeds free tier limits in specific regions.
Sources
Inquiry About AWS Free Tier S3 Usage Limits | AWS re:Post
Inquiry Regarding AWS Free Tier Usage for S3 and CloudFront | AWS re:Post