# United States Postal Service

**Canonical:** https://apis.io/providers/united-states-postal-service/  
**Website:** https://developers.usps.com/  
**APIs profiled:** 12

The United States Postal Service (USPS) provides a modern REST API platform at developers.usps.com that gives ecommerce websites, shipping software, and logistics systems access to postal data and services. APIs cover address validation, package tracking, domestic and international shipping labels, pricing, carrier pickup scheduling, location finding, and Informed Delivery campaign management. The legacy Web Tools platform was retired January 25, 2026, with all functionality migrated to the new OAuth 2.0-secured API platform.

## Kin Score — 35.9 / 100 (thin)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.4 from 35.5).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 32.6 |
| Governance | 28.8 |
| Contract Governance | 28.8 |
| Operational Transparency | 7.9 |
| Developer Ergonomics | 42.9 |
| Commercial Clarity | 23.7 |
| Access Clarity | 23.7 |

Regulatory layer — **Government & Public Sector**: 38.9 (matched via tags).

## Agent readiness — 41.9 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (12)

- **USPS International Prices API** — Provides pricing for international USPS products based on shipment characteristics including destination country, weight, dimensions, and service class.
- **USPS Domestic Labels API** — Creates domestic shipping labels with barcodes in multiple formats and generates Shipping Services Files. Requires USPS Ship enrollment and Enterprise Payment Account.
- **USPS International Labels API** — Creates international shipping labels and generates required Shipping Services Files for customs compliance.
- **USPS Locations API** — Identifies drop-off facilities and destination entry points for various USPS services. Supports post office locator and drop-off location finder.
- **USPS Service Standards API** — Provides delivery benchmarks showing expected transit times between origin and destination ZIP Codes for USPS mail classes.
- **USPS Shipping Options API** — Returns a comprehensive list of pricing, service standards, and shipping options for USPS products in a single API call, eliminating the need to query multiple APIs separately.
- **USPS SCAN Forms API** — Links multiple domestic and international labels through a single electronic file number, creating Shipment Confirmation Acceptance Notice forms for batch shipping operations.
- **USPS OAuth API** — Industry-standard OAuth 2.0 Client Credentials authentication protecting access to all USPS APIs. Returns Bearer Tokens used in the Authorization header for all USPS API calls.
- **United States Postal Service Addresses API** — Address validation and standardization operations
- **United States Postal Service Carrier Pickup API** — Schedule and manage USPS carrier pickup requests
- **United States Postal Service Domestic Prices API** — Domestic postage pricing and rate calculation operations
- **United States Postal Service Tracking API** — Package tracking status and event operations

## Agentic access (1)

- **United States Postal Service Agentic Access** — 12 operations · 7 acting

## Security (2)

- **United States Postal Service Authentication** — http · 1 scheme
- **United States Postal Service Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **United States Postal Service Plans Pricing**

## Use cases (8)

- **E-Commerce Shipping Integration** — Calculate shipping rates, generate labels, and provide package tracking directly within e-commerce checkout flows.
- **Address Verification at Checkout** — Validate and standardize customer addresses during checkout to reduce failed deliveries and return rates.
- **Shipping Label Generation** — Programmatically create domestic and international USPS shipping labels with barcodes for fulfillment operations.
- **Carrier Pickup Automation** — Schedule and manage USPS carrier pickups automatically based on order fulfillment triggers.
- **Logistics Rate Shopping** — Compare USPS service options and pricing to select the most cost-effective shipping method.
- **Delivery Time Estimation** — Display accurate expected delivery dates to customers using USPS service standards data.
- **Post Office Finder** — Help customers locate the nearest USPS facility for drop-offs or in-person services.
- **Informed Delivery Campaigns** — Enhance customer engagement by adding digital content to mail pieces viewed through Informed Delivery.

## Tags

Government, Postal Service, Shipping, Logistics, Address Validation, Package Tracking

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/united-states-postal-service/). Scores are computed from the provider's own public artifacts under a published rubric.