United States Postal Service · Rate Limits

United States Postal Service Rate Limits

USPS publishes that quotas exist on the modernized developers.usps.com platform, but it does not publish per-second or per-day numeric limits. Quota increases and access to non-default APIs are gated behind a USPS API service request. Authentication is OAuth 2.0 Client Credentials.

2 Limits
GovernmentPostal ServiceRate Limiting

Limits

Default product quota api-key
varies
see https://developers.usps.com (request quota increase via USPS API service request)
Labels APIs api-key
varies
enrollment in USPS Ship and Enterprise Payment Account required

Policies

OAuth 2.0 Client Credentials
Access uses OAuth 2.0 client credentials issued through the USPS Developer Portal.
Quota Increase Process
To raise default quotas or access non-default APIs, submit a USPS API service request through the developer portal.
Labels Approval
Labels APIs require additional approval, USPS Ship enrollment, and an Enterprise Payment Account before activation.

Sources