---
title: "EasyPost vs Shippo vs ShipStation vs ShipEngine: Carrier API Reliability"
canonical_url: "https://shipzil.com/compare"
last_updated: "2026-10-06T02:50:06.090Z"
content_type: "static snapshot"
source: "Shipzil"
---

# EasyPost vs Shippo vs ShipStation vs ShipEngine: carrier API reliability

Shipzil watches all four shipping platforms in two independent ways: what each one reports about USPS, FedEx and UPS on its own status page, and a real rate request Shipzil sends to each platform's production API every 5 minutes. The two are shown separately and never blended into one score.

Figures as of October 6, 2026 (2026-10-06 02:50 UTC). Reported window: 90 days from July 9, 2026. Measured: 26 days of checks.

**Reported and measured disagree.** Shippo has published the most carrier incidents (61), yet answered 100.00% of Shipzil's measured checks. ShipEngine has published 25 and failed 146 of 6,960 measured checks (97.90% success). A platform that publishes more incidents looks worse on reported uptime whether or not it fails more often.

## Reported uptime by carrier, 90 days

Calculated from the incidents each platform published, from component state changes where given. Not independently measured. Account-only incidents and standing advisories are excluded.

| Carrier | EasyPost | Shippo | ShipStation | ShipEngine |
|---------|------|------|------|------|
| USPS | 99.50%, 5 inc., 10.7h | 94.32% (worst), 22 inc., 122.6h | 97.50%, 4 inc., 54.1h | 99.97%, 1 inc., 0.6h |
| FedEx | 99.81%, 3 inc., 4.1h | 95.87% (worst), 8 inc., 89.2h | 99.53%, 3 inc., 10.2h | 99.21%, 2 inc., 17.1h |
| UPS | 99.52%, 6 inc., 10.4h | 95.47%, 11 inc., 97.8h | 99.53%, 3 inc., 10.2h | 94.82% (worst), 2 inc., 112.0h |

ShipStation and ShipEngine reach USPS through Stamps.com; EasyPost and Shippo connect directly.

## Measured rate checks, 26 days

Same domestic US rate request to each production API every 5 minutes. Success = answered within 15s with at least one bookable rate. Latency is not a ranking: each account quotes different carriers.

| Platform | Company | Check success | Failed / checks | Median | p95 | Carriers quoted |
|----------|---------|---------------|-----------------|--------|-----|-----------------|
| EasyPost | EasyPost | 99.94% | 4 / 6960 | 1851ms | 4787ms | USPS, FedEx |
| Shippo | Shippo | 100.00% | 0 / 6960 | 1980ms | 4577ms | USPS, UPS |
| ShipStation | Auctane | 98.53% | 102 / 6960 | 3804ms | 10166ms | USPS |
| ShipEngine | Auctane | 97.90% | 146 / 6960 | 4533ms | 12464ms | USPS, UPS |

Daily rollups (JSON): https://shipzil-worker.sameer-kumar.workers.dev/api/v1/rollups

## Carrier incidents each platform has published

- EasyPost: 40
- Shippo: 61
- ShipStation: 9
- ShipEngine: 25

Of 135 carrier-affecting incidents, 90% were reported by only one company.

## Questions

### Which shipping API is the most reliable: EasyPost, Shippo, ShipStation or ShipEngine?

It depends on the carrier and on whether you count what the platforms report or what a real request does. Over the 90 days to October 6, 2026, by each platform's own incident reports, for USPS, ShipEngine had the highest reported uptime (99.97%) and Shippo the lowest (94.32%); for FedEx, EasyPost had the highest reported uptime (99.81%) and Shippo the lowest (95.87%); for UPS, ShipStation had the highest reported uptime (99.53%) and ShipEngine the lowest (94.82%). Measured by Shipzil's own production rate request every 5 minutes over 26 days, the share of checks that returned a bookable rate was EasyPost 99.94% of 6,960, Shippo 100.00% of 6,960, ShipStation 98.53% of 6,960, ShipEngine 97.90% of 6,960. The two measures can disagree: reported uptime only counts outages a platform chose to publish.

### EasyPost vs Shippo: which has better uptime?

By the incidents each platform reported over the 90 days to October 6, 2026, EasyPost vs Shippo carrier uptime was USPS 99.50% vs 94.32%, FedEx 99.81% vs 95.87%, UPS 99.52% vs 95.47%. In Shipzil's own measured checks over 26 days, EasyPost returned a bookable rate on 99.94% of 6,960 requests and Shippo on 100.00% of 6,960. Shippo has published more carrier incidents (61 against 40 in Shipzil's archive), and a platform that reports more looks worse on reported uptime, which is why the measured checks are shown beside it.

### Are ShipStation and ShipEngine the same platform?

They are separate products from the same company, Auctane. Both reach USPS through Stamps.com rather than directly, and their status pages often publish the same incidents, so Shipzil counts the two as one independent source when deciding whether a carrier problem is corroborated.

### How can I tell if a carrier is down or just my shipping platform?

See whether more than one company reports it. A USPS, FedEx or UPS problem reported by only one platform is most likely that platform's integration; reports from two or more independent companies point to the carrier. Of 135 carrier-affecting incidents Shipzil has recorded, 90% were reported by only one company.

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Source: https://shipzil.com/compare