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.

United States Postal Service Rate Limits is the machine-readable rate-limit profile for United States Postal Service on the APIs.io network, in the API Commons Rate Limits shape.

It captures 2 rate-limit definitions, measuring varies.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes 3 backoff/retry policies defined.

Tagged areas include Government, Postal Service, and Rate Limiting.

2 Limits
Method: generated, dated 2026-05-05.
Written by API Evangelist on 2026-05-05 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
View Source
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

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Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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Call it yourself

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This rate limit 
curl "https://apis.io/api/v1/rate-limits/united-states-postal-service-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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