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Is USPS API down?

As of 2026-08-08, USPS API is operational on 4 of 4 monitored platforms. Last resolved incident: August 7, 2026. Over the last 90 days the worst-performing platform for USPS was Shippo, at 98.39% reported uptime. Shipzil tracks USPS by cross-referencing status reported by EasyPost, Shippo, ShipStation and ShipEngine — four platforms run by three independent companies.

Status ● Operational
90-day uptime, worst platform

98.39% on Shippo

Sources reporting a problem

0 of 3

Last incident

Status by platform

Platform Company Status Status since
EasyPost EasyPost ● Operational
Shippo Shippo ● Operational
ShipStation Auctane ● Operational
ShipEngine Auctane ● Operational

Reported uptime, 90 days

Where a platform published component state changes, the window is measured from those — when each component actually left and returned to operational. Otherwise it falls back to when the incident was opened and closed, which overstates it. Either way this is uptime as reported by the platforms, not independently measured: there may be outages nobody reported. Account-surface incidents and standing advisories are excluded, since neither is carrier API downtime.

EasyPost 99.48% 20 incidents · 10 measured
Shippo worst 98.39% 30 incidents · 15 measured
ShipStation no public metrics 99.19% 7 incidents · 5 measured
ShipEngine no public metrics 99.80% 16 incidents · 15 measured

API response time, 24h

EasyPost 233ms avg 228ms
Shippo 429ms avg 410ms

Error rate, 24h

EasyPost — USPS Error Rate 0.00% avg 0.01%

Incident history (78)

minor Carrier Issues 4h 11m ShipStation
major USPS Shipment service outage 2h 1m Shippo
minor* EasyPost is experiencing internet connectivity issues and is investigating 7h 28m EasyPost
major Elevated error rate on Rating API from USPS. 3h 8m Shippo
minor Elevated error rate on USPS Shipment service 6h 10m Shippo
major General Latency 34m ShipEngine
minor USPS Shipment service outage 4h 30m Shippo
minor Carrier Issues 14h 9m ShipStation
minor Elevated error rate on USPS Shipment service 7h 22m Shippo
critical Degraded API Performance 9m EasyPost
minor Elevated error rate on Rating API from USPS. 1h 17m Shippo
minor* USPS shipment generation was briefly unavailable 0m EasyPost
minor Increased rate of latency and timeout errors. 5h 45m ShipEngine
major Smart rates are intermittently failing 3h 56m EasyPost
minor Degraded Performance for Rating and Label Generation APIs 2h 10m Shippo
minor Elevated Errors Affecting QR Code Generation 3h 4m Shippo
minor USPS Tracking disruption 5h 7m Shippo
minor* Elevated error rate on USPS, UPS 38m EasyPost
minor* Delays to async processes 1h 18m EasyPost
major Major Outage for Advanced Tracking 1h 28m EasyPost
minor* Partial API outage 13m EasyPost
major We are experiencing intermittent issues with our API Endpoints 32m EasyPost
minor USPS Tracking disruption 2h 15m Shippo
minor Elevated 5XX responses 4h 44m EasyPost
minor* 3rd party tracking updates issue inferred not counted 22d 11h Shippo
minor ShipStation 16h 5m ShipStation
minor Elevated rate of timeouts 21h 10m ShipEngine
critical Elevated Error Rates Across Shippo Services 40m Shippo
minor Elevated rate of timeouts 4h 29m ShipEngine
minor* Observing Interruption in Receiving USPS Tracking Events 5h 47m Shippo
minor* Observing Interruption in Receiving USPS Tracking Events 5h 22m Shippo
minor Observing Interruption in Receiving USPS Tracking Events 3h 42m Shippo
critical Intermittent USPS API Outage on multiple API 1h 10m Shippo
minor USPS Tracking disruption 5h 19m Shippo
minor Delay in USPS Tracking Updates 6h 3m Shippo
minor USPS Tracking disruption 3h 16m Shippo
minor Observing Interruption in Receiving USPS Tracking Events 1h 57m Shippo
minor Degraded API Performance inferred 37m Shippo
minor ShipStation Slowness inferred not counted 9d 3h ShipStation
minor USPS tracking outage 1h 44m Shippo
minor* Elevated errors in Tracking 54m EasyPost
major Observing Interruption in Receiving USPS Tracking Events 48m Shippo
major Temporary disruption affecting USPS Military and U.S. Territory Shipments 1d 1h Shippo
major Elevated error rate on USPS Transaction API 32m Shippo
minor 12 Month API Key Generation 5h 15m ShipStation
critical USPS Manifest outage 2h 46m Shippo
minor USPS QR Code Service Disruption 2h 10m Shippo
major Elevated rate of timeouts 1h 35m ShipEngine
minor Rate Latency 2h 18m ShipStation
minor Delay in USPS Tracking Updates 3h 27m Shippo
minor Increased Rate of Timeout Errors 42m ShipEngine
major USPS QR Code Generation Issues 2h 58m Shippo
critical Elevated error rate on USPS Tracking 7h 26m Shippo
minor Degraded Rate Retrieval for Multiple Carriers inferred 1h 18m Shippo
minor ShipStation API Access Issue 1h 16m ShipEngine
minor ShipStation Slowness / Unable to Load inferred 48m ShipStation
major Dashboard Login Issues 27m ShipEngine
minor* API issues 2h 4m EasyPost
minor* Issues with Shipments and Trackers 3h 15m EasyPost
major AWS Outage Impacting Overall Performance 23h 46m ShipEngine
minor ShipStation System Error inferred 5h 22m ShipStation
major Label buy issues affecting multiple carriers inferred 1h 45m EasyPost
major carrier_id and warehouse-id not found errors when rating and creating labels 2h 43m ShipEngine
minor Issues attempting to load, or purchase labels, for an existing shipment 52m EasyPost
minor Poor performance and time outs reported on multiple endpoints. 1h 3m ShipEngine
minor* USPS Create Label Errors inferred 0m ShipEngine
none USPS Label Buys not counted 1h 54m EasyPost
minor Timeouts encountered when getting rates 1h 55m ShipEngine
major Disruption of address validation services 1h 26m ShipEngine
minor* Elevated 500 Status Response inferred 0m ShipEngine
major API Timeouts 3h 5m ShipEngine
major Label Buy Issues 35m EasyPost
minor Elevated 500 errors 3h 16m EasyPost
minor* Ongoing Canadian Mail Disruption not counted 13d 16h EasyPost
minor USPS Label Broker Outage 1h 23m EasyPost
major 504 Timeout Errors 3h 0m ShipEngine
major Core API Partial Outage inferred 55m EasyPost
major Timeouts accessing ShipEngine API inferred 48m ShipEngine
Scheduled maintenance (70)
maint Planned Systems Maintenance For Easypost Services EasyPost
maint Planned Systems Maintenance For Easypost Services EasyPost
maint USPS Tracking Maintenance Shippo
maint Planned System Maintenance For Easypost Services EasyPost
maint USPS QR Code maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint Team Global Express Maintenance ShipStation
maint USPS Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS QR Code maintenance Shippo
maint Scheduled Maintenance ShipEngine
maint 3rd Party tracking API scheduled maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint USPS API Infrastructure Maintenance – July 9, 2026 Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint USPS API Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint 3rd Party Vendor maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint Scheduled Carrier Maintenance - UPS and USPS EasyPost
maint Scheduled API Maintenance EasyPost
maint USPS scheduled maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint 3rd Party Tracking Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS QR Code maintenance Shippo
maint USPS Scheduled Maintenance-MAY 16 Shippo
maint USPS QR Code maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled maintenance Shippo
maint USPS QR Code maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS PC Postage System Maintenance EasyPost
maint USPS Manifest maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint USPS Tracking Maintenance Shippo
maint USPS Scheduled Maintenance Shippo
maint USPS PC Postage System Maintenance EasyPost
maint Scheduled Maintenance for Osm Worldwide V2 EasyPost
maint Scheduled Maintenance for Jet, Optima, and Rover EasyPost
maint Scheduled Carrier Maintenance EasyPost
maint Webhook Event Maintenance EasyPost
maint Webhook Event Maintenance EasyPost
maint API Maintenance EasyPost
maint Carrier Maintenance EasyPost
maint Scheduled Tracking Maintenance EasyPost
maint Webhook Event Maintenance EasyPost
maint USPS PC Postage System Maintenance EasyPost
maint Scheduled Database Maintenance EasyPost
maint PC Postage System Maintenance EasyPost
maint USPS Label Broker® scheduled maintenance EasyPost
maint Network maintenance USPS label buys EasyPost
maint Database maintenance EasyPost
maint USPS Label Broker® scheduled maintenance EasyPost
maint USPS Label Broker® scheduled maintenance EasyPost
maint Stamps.com - Scheduled Maintenance ShipEngine
maint Stamps.com - Scheduled Maintenance ShipEngine
maint Stamps.com Scheduled Maintenance ShipEngine
maint Stamps.com Scheduled Maintenance ShipEngine
maint Stamps.com Scheduled Maintenance ShipEngine
maint Stamps.com Scheduled Maintenance ShipEngine