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Outage in Easypost

Elevated errors with USPS Services

Resolved Major
September 20, 2026 - Started 1 day ago - Lasted about 5 hours
Official incident page

Incident Report

Summary AI Generated

EasyPost experienced a 5.4-hour major incident where USPS Ship services returned errors and failed the majority of the time, caused by invalid rate data stemming from a USPS-side maintenance rollout. EasyPost deployed a partial mitigation that restored multi-carrier requests including USPS alongside other carriers, but requests solely dependent on USPS Ship continued to fail until USPS deployed their own fix. The incident was fully resolved once USPS completed their remediation, with rating and shipping requests returning to normal operation.

We are aware of an issue affecting USPS services, where some requests may be returning errors. We have confirmed the problem and our team is actively investigating.

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Latest Updates ( sorted recent to last )
RESOLVED about 24 hours ago - at 09/20/2026 10:19PM

USPS Ship services have recovered. Rating and shipping requests are now completing successfully.

MONITORING 1 day ago - at 09/20/2026 09:49PM

USPS has begun deploying a fix and we are monitoring our systems closely for recovery of USPS Ship. Next update within the hour, or sooner as recovery is confirmed

IDENTIFIED 1 day ago - at 09/20/2026 08:59PM

USPS Ship requests continue to fail the majority of the time due to a USPS-side issue. USPS is testing a fix, but no ETA on resolution provided. Next update in 60 minutes, or sooner if anything changes.

IDENTIFIED 1 day ago - at 09/20/2026 08:15PM

USPS Ship services remain affected. USPS Ship requests continue to fail the majority of the time. USPS has confirmed they are actively working on a fix, but no estimated resolution time is available yet. Next update within 45 minutes, or sooner if anything changes.

IDENTIFIED 1 day ago - at 09/20/2026 07:25PM

No change to report at this time. USPS Ship services are still affected. USPS has not yet resolved the invalid rate data on their side, so USPS Ship dependent requests continue to fail the majority of the time.   We'll share our next update within 45 minutes, or sooner if anything changes.

IDENTIFIED 1 day ago - at 09/20/2026 06:41PM

We've deployed and verified a fix on our side that reduce the blast radius of this issue. Shipment and rate requests that include USPS Ship along side other carriers are now succeeding normally.

USPS Ship service remain affected. USPS Ship is still returning invalid rate data, so requests that require USPS Ship may continue to fail until USPS Ship resolves the issue on their side. We remain in active contact with USPS Ship on the underlying problem.

What you may experience: Non-USPS requests should be working normally. Requests that depend on USPS Ship may still fail. A specific restoration time from USPS Ship is not yet available.

We'll provide our next update within 30 minutes, or sooner as the situation changes.

IDENTIFIED 1 day ago - at 09/20/2026 05:44PM

The errors affecting USPS services are caused by an issue on USPS's side, which USPS is actively working to resolve. We are in active contact with them as they work to restore normal service.

What you may experience: Requests to USPS services may fail or return errors until USPS resolves the issue. Other carriers and services are unaffected.

A specific restoration time is not yet available from USPS. We will update as soon as we have one, and no later than our next scheduled update in 30 minutes.

IDENTIFIED 1 day ago - at 09/20/2026 05:12PM

We have identified the cause of the elevated errors affecting USPS services. The issue is related to an ongoing USPS maintenance rollout, and we've communicated to them that we are seeing elevated errors. They are investigating to determine if they should rollback or extend the window.

INVESTIGATING 1 day ago - at 09/20/2026 04:55PM

We are aware of an issue affecting USPS services, where some requests may be returning errors. We have confirmed the problem and our team is actively investigating.

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