United States Postal Service

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.

United States Postal Service publishes 12 APIs on the APIs.io network, including Addresses API, Carrier Pickup API, Domestic Prices API, and 9 more. Tagged areas include Government, Postal Service, Shipping, Logistics, and Address Validation.

United States Postal Service’s developer surface includes authentication, developer portal, getting-started guide, documentation, FAQ, support, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

24.6/100 emerging ▬ flat Agent 28/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-04 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

4 published contracts 8 Features 8 Use Cases

GovernmentPostal ServiceShipping Logistics Address Validation Package Tracking

Kin Score

Kin Score How this is scored →
scored 2026-10-04 · rubric v0.23.0

Composite quality — 24.6/100 · emerging

Contract Quality 4.4 / 19

Developer Ergonomics 7.5 / 15

Access Clarity 1.6 / 15

Operational Transparency 0.5 / 10

Contract Governance 0.0 / 9

Discoverability 5.4 / 8

Regulatory Posture 1.5 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/usps: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

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

Scroll for all 12

Features 8

Notable capabilities this provider offers.

OAuth 2.0 Authentication

Secure API access using industry-standard OAuth 2.0 Client Credentials flow with Bearer Token authentication.

RESTful Architecture

All APIs follow RESTful conventions with JSON request and response bodies.

Sandbox Testing Environment

Testing Environment for Mailers (TEM) at apis-tem.usps.com for safe API testing before going to production.

Address Standardization

USPS Coding Accuracy Support System (CASS) compliant address validation and standardization.

Delivery Point Validation

DPV confirmation codes ensure packages can be delivered to the validated address.

Real-Time Tracking

Live package tracking with scan events, timestamps, and location details from USPS systems.

Webhook Subscriptions

Event-driven subscription APIs for tracking events, adjustments, and disputes delivered via webhooks.

Batch Processing

Support for bulk operations including multiple tracking lookups and SCAN Form generation.

Scroll for all 8

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Usps Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Use Cases 8

What developers build with this provider.

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.

Scroll for all 8

Integrations 6

Pre-built integrations with other platforms and tools.

Shopify

USPS shipping integration available through Shopify Shipping for label generation and rate calculation.

WooCommerce

WooCommerce shipping plugins integrate USPS APIs for rate calculation and label printing.

Magento

Adobe Commerce and Magento integrate USPS for shipping rate display and fulfillment.

ShipStation

ShipStation multi-carrier shipping platform integrates USPS APIs for ecommerce fulfillment.

EasyPost

EasyPost shipping API aggregator provides access to USPS services alongside other carriers.

Stamps.com

Stamps.com and Pitney Bowes shipping platforms integrate USPS APIs for postage and label printing.

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

Vocabulary

Vocabulary

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

GitHubRepository

GitHubRepository

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

FAQ

FAQ

Support

Support

Commercial 1

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Source (apis.yml)

name: United States Postal Service
description: 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.
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - usps/api-examples
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/united-states-postal-service.png
url: https://raw.githubusercontent.com/api-evangelist/usps/refs/heads/main/apis.yml
created: 2024/01/01
modified: '2026-05-19'
specificationVersion: '0.23'
tags:
- Government
- Postal Service
- Shipping
- Logistics
- Address Validation
- Package Tracking
apis:
- name: USPS International Prices API
  description: Provides pricing for international USPS products based on shipment characteristics including destination country,
    weight, dimensions, and service class.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/internationalpricesv3
  baseURL: https://apis.usps.com
  tags:
  - International
  - Pricing
  - Postage
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/internationalpricesv3
  aid: usps:usps-international-prices-api
- name: USPS Domestic Labels API
  description: Creates domestic shipping labels with barcodes in multiple formats and generates Shipping Services Files. Requires
    USPS Ship enrollment and Enterprise Payment Account.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/domesticlabelsv3
  baseURL: https://apis.usps.com
  tags:
  - Labels
  - Shipping
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/domesticlabelsv3
  aid: usps:labels
- name: USPS International Labels API
  description: Creates international shipping labels and generates required Shipping Services Files for customs compliance.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/internationallabelsv3
  baseURL: https://apis.usps.com
  tags:
  - International
  - Labels
  - Shipping
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/internationallabelsv3
  aid: usps:usps-international-labels-api
- name: USPS Locations API
  description: Identifies drop-off facilities and destination entry points for various USPS services. Supports post office
    locator and drop-off location finder.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/locationsv3
  baseURL: https://apis.usps.com
  tags:
  - Location
  - Post Offices
  - Government
  tags_raw:
  - Locations
  - Post Offices
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/locationsv3
  aid: usps:usps-locations-api
- name: USPS Service Standards API
  description: Provides delivery benchmarks showing expected transit times between origin and destination ZIP Codes for USPS
    mail classes.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/standardsv3
  baseURL: https://apis.usps.com
  tags:
  - Service Standards
  - Delivery
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/standardsv3
  aid: usps:usps-service-standards-api
- name: USPS Shipping Options API
  description: 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.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/shippingoptionsv3
  baseURL: https://apis.usps.com
  tags:
  - Shipping
  - Pricing
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/shippingoptionsv3
  aid: usps:usps-shipping-options-api
- name: USPS SCAN Forms API
  description: Links multiple domestic and international labels through a single electronic file number, creating Shipment
    Confirmation Acceptance Notice forms for batch shipping operations.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/scanv3
  baseURL: https://apis.usps.com
  tags:
  - SCAN Forms
  - Shipping
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/scanv3
  aid: usps:usps-scan-forms-api
- name: USPS OAuth API
  description: 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.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.usps.com/Oauth
  baseURL: https://apis.usps.com
  tags:
  - Authentication
  - Government
  tags_raw:
  - Authentication
  - OAuth
  - Government
  properties:
  - type: Documentation
    url: https://developers.usps.com/Oauth
  - type: Authentication
    url: https://developers.usps.com/getting-started
  aid: usps:oauth2
- aid: usps:usps-addresses-api
  name: United States Postal Service Addresses API
  description: Address validation and standardization operations
  humanURL: https://developers.usps.com/internationalpricesv3
  baseURL: https://apis.usps.com
  tags:
  - Addresses
  properties:
  - type: OpenAPI
    url: openapi/usps-addresses-api-openapi.yml
  - type: Documentation
    url: https://developers.usps.com/addressesv3
  - type: JSONSchema
    url: json-schema/addresses-address-schema.json
  - type: JSONSchema
    url: json-schema/addresses-city-state-schema.json
  - type: JSONStructure
    url: json-structure/addresses-address-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-addresses-context.jsonld
  - type: Examples
    url: examples/addresses-address-example.json
  - type: Documentation
    url: https://developers.usps.com/trackingv3r2
  - type: JSONSchema
    url: json-schema/tracking-tracking-event-schema.json
  - type: JSONStructure
    url: json-structure/tracking-tracking-event-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-tracking-context.jsonld
  - type: Examples
    url: examples/tracking-tracking-event-example.json
  - type: Documentation
    url: https://developers.usps.com/domesticpricesv3
  - type: JSONSchema
    url: json-schema/domestic-prices-base-rate-request-schema.json
  - type: JSONStructure
    url: json-structure/domestic-prices-base-rate-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-domestic-context.jsonld
  - type: Examples
    url: examples/domestic-prices-base-rate-request-example.json
  - type: Documentation
    url: https://developers.usps.com/carrierpickupv3
  - type: JSONSchema
    url: json-schema/carrier-pickup-pickup-request-schema.json
  - type: JSONStructure
    url: json-structure/carrier-pickup-pickup-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-carrier-context.jsonld
  - type: Examples
    url: examples/carrier-pickup-pickup-request-example.json
- aid: usps:usps-carrier-pickup-api
  name: United States Postal Service Carrier Pickup API
  description: Schedule and manage USPS carrier pickup requests
  humanURL: https://developers.usps.com/internationalpricesv3
  baseURL: https://apis.usps.com
  tags:
  - Carrier Pickup
  properties:
  - type: OpenAPI
    url: openapi/usps-carrier-pickup-api-openapi.yml
  - type: Documentation
    url: https://developers.usps.com/addressesv3
  - type: JSONSchema
    url: json-schema/addresses-address-schema.json
  - type: JSONSchema
    url: json-schema/addresses-city-state-schema.json
  - type: JSONStructure
    url: json-structure/addresses-address-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-addresses-context.jsonld
  - type: Examples
    url: examples/addresses-address-example.json
  - type: Documentation
    url: https://developers.usps.com/trackingv3r2
  - type: JSONSchema
    url: json-schema/tracking-tracking-event-schema.json
  - type: JSONStructure
    url: json-structure/tracking-tracking-event-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-tracking-context.jsonld
  - type: Examples
    url: examples/tracking-tracking-event-example.json
  - type: Documentation
    url: https://developers.usps.com/domesticpricesv3
  - type: JSONSchema
    url: json-schema/domestic-prices-base-rate-request-schema.json
  - type: JSONStructure
    url: json-structure/domestic-prices-base-rate-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-domestic-context.jsonld
  - type: Examples
    url: examples/domestic-prices-base-rate-request-example.json
  - type: Documentation
    url: https://developers.usps.com/carrierpickupv3
  - type: JSONSchema
    url: json-schema/carrier-pickup-pickup-request-schema.json
  - type: JSONStructure
    url: json-structure/carrier-pickup-pickup-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-carrier-context.jsonld
  - type: Examples
    url: examples/carrier-pickup-pickup-request-example.json
- aid: usps:usps-domestic-prices-api
  name: United States Postal Service Domestic Prices API
  description: Domestic postage pricing and rate calculation operations
  humanURL: https://developers.usps.com/internationalpricesv3
  baseURL: https://apis.usps.com
  tags:
  - Domestic Prices
  properties:
  - type: OpenAPI
    url: openapi/usps-domestic-prices-api-openapi.yml
  - type: Documentation
    url: https://developers.usps.com/addressesv3
  - type: JSONSchema
    url: json-schema/addresses-address-schema.json
  - type: JSONSchema
    url: json-schema/addresses-city-state-schema.json
  - type: JSONStructure
    url: json-structure/addresses-address-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-addresses-context.jsonld
  - type: Examples
    url: examples/addresses-address-example.json
  - type: Documentation
    url: https://developers.usps.com/trackingv3r2
  - type: JSONSchema
    url: json-schema/tracking-tracking-event-schema.json
  - type: JSONStructure
    url: json-structure/tracking-tracking-event-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-tracking-context.jsonld
  - type: Examples
    url: examples/tracking-tracking-event-example.json
  - type: Documentation
    url: https://developers.usps.com/domesticpricesv3
  - type: JSONSchema
    url: json-schema/domestic-prices-base-rate-request-schema.json
  - type: JSONStructure
    url: json-structure/domestic-prices-base-rate-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-domestic-context.jsonld
  - type: Examples
    url: examples/domestic-prices-base-rate-request-example.json
  - type: Documentation
    url: https://developers.usps.com/carrierpickupv3
  - type: JSONSchema
    url: json-schema/carrier-pickup-pickup-request-schema.json
  - type: JSONStructure
    url: json-structure/carrier-pickup-pickup-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-carrier-context.jsonld
  - type: Examples
    url: examples/carrier-pickup-pickup-request-example.json
- aid: usps:usps-tracking-api
  name: United States Postal Service Tracking API
  description: Package tracking status and event operations
  humanURL: https://developers.usps.com/internationalpricesv3
  baseURL: https://apis.usps.com
  tags:
  - Tracking
  properties:
  - type: OpenAPI
    url: openapi/usps-tracking-api-openapi.yml
  - type: Documentation
    url: https://developers.usps.com/addressesv3
  - type: JSONSchema
    url: json-schema/addresses-address-schema.json
  - type: JSONSchema
    url: json-schema/addresses-city-state-schema.json
  - type: JSONStructure
    url: json-structure/addresses-address-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-addresses-context.jsonld
  - type: Examples
    url: examples/addresses-address-example.json
  - type: Documentation
    url: https://developers.usps.com/trackingv3r2
  - type: JSONSchema
    url: json-schema/tracking-tracking-event-schema.json
  - type: JSONStructure
    url: json-structure/tracking-tracking-event-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-tracking-context.jsonld
  - type: Examples
    url: examples/tracking-tracking-event-example.json
  - type: Documentation
    url: https://developers.usps.com/domesticpricesv3
  - type: JSONSchema
    url: json-schema/domestic-prices-base-rate-request-schema.json
  - type: JSONStructure
    url: json-structure/domestic-prices-base-rate-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-domestic-context.jsonld
  - type: Examples
    url: examples/domestic-prices-base-rate-request-example.json
  - type: Documentation
    url: https://developers.usps.com/carrierpickupv3
  - type: JSONSchema
    url: json-schema/carrier-pickup-pickup-request-schema.json
  - type: JSONStructure
    url: json-structure/carrier-pickup-pickup-request-structure.json
  - type: JSONLD
    url: json-ld/united-states-postal-service-carrier-context.jsonld
  - type: Examples
    url: examples/carrier-pickup-pickup-request-example.json
common:
- type: Website
  url: https://www.usps.com/
- type: AgenticAccess
  url: agentic-access/united-states-postal-service-agentic-access.yml
- type: DomainSecurity
  url: security/united-states-postal-service-domain-security.yml
- type: Authentication
  url: authentication/united-states-postal-service-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/usps
- type: Portal
  url: https://developers.usps.com/
- type: GettingStarted
  url: https://developers.usps.com/getting-started
- type: Documentation
  url: https://developers.usps.com/apis
- type: TermsOfService
  url: https://developers.usps.com/terms-and-conditions
- type: FAQ
  url: https://developers.usps.com/faq
- type: Support
  url: https://emailus.usps.com/s/web-tools-inquiry
- type: GitHubOrganization
  url: https://github.com/USPS
- type: GitHubRepository
  url: https://github.com/USPS/api-examples
- type: Blog
  url: https://about.usps.com/news/latestnews.rss
- type: Features
  data:
  - name: OAuth 2.0 Authentication
    description: Secure API access using industry-standard OAuth 2.0 Client Credentials flow with Bearer Token authentication.
  - name: RESTful Architecture
    description: All APIs follow RESTful conventions with JSON request and response bodies.
  - name: Sandbox Testing Environment
    description: Testing Environment for Mailers (TEM) at apis-tem.usps.com for safe API testing before going to production.
  - name: Address Standardization
    description: USPS Coding Accuracy Support System (CASS) compliant address validation and standardization.
  - name: Delivery Point Validation
    description: DPV confirmation codes ensure packages can be delivered to the validated address.
  - name: Real-Time Tracking
    description: Live package tracking with scan events, timestamps, and location details from USPS systems.
  - name: Webhook Subscriptions
    description: Event-driven subscription APIs for tracking events, adjustments, and disputes delivered via webhooks.
  - name: Batch Processing
    description: Support for bulk operations including multiple tracking lookups and SCAN Form generation.
- type: UseCases
  data:
  - name: E-Commerce Shipping Integration
    description: Calculate shipping rates, generate labels, and provide package tracking directly within e-commerce checkout
      flows.
  - name: Address Verification at Checkout
    description: Validate and standardize customer addresses during checkout to reduce failed deliveries and return rates.
  - name: Shipping Label Generation
    description: Programmatically create domestic and international USPS shipping labels with barcodes for fulfillment operations.
  - name: Carrier Pickup Automation
    description: Schedule and manage USPS carrier pickups automatically based on order fulfillment triggers.
  - name: Logistics Rate Shopping
    description: Compare USPS service options and pricing to select the most cost-effective shipping method.
  - name: Delivery Time Estimation
    description: Display accurate expected delivery dates to customers using USPS service standards data.
  - name: Post Office Finder
    description: Help customers locate the nearest USPS facility for drop-offs or in-person services.
  - name: Informed Delivery Campaigns
    description: Enhance customer engagement by adding digital content to mail pieces viewed through Informed Delivery.
- type: Integrations
  data:
  - name: Shopify
    description: USPS shipping integration available through Shopify Shipping for label generation and rate calculation.
  - name: WooCommerce
    description: WooCommerce shipping plugins integrate USPS APIs for rate calculation and label printing.
  - name: Magento
    description: Adobe Commerce and Magento integrate USPS for shipping rate display and fulfillment.
  - name: ShipStation
    description: ShipStation multi-carrier shipping platform integrates USPS APIs for ecommerce fulfillment.
  - name: EasyPost
    description: EasyPost shipping API aggregator provides access to USPS services alongside other carriers.
  - name: Stamps.com
    description: Stamps.com and Pitney Bowes shipping platforms integrate USPS APIs for postage and label printing.
- type: SpectralRules
  url: rules/united-states-postal-service-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/united-states-postal-service-vocabulary.yaml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
aid: usps

Work with this as data

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9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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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This provider

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Every operation they expose

curl "https://apis.io/api/v1/providers/usps/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/usps/evidence"

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