Payment Processors · reliability comparison
Stax vs SumUp: which is more reliable? (2026)
SumUp is more reliable than Stax, scoring 54.2 vs 49.0 out of 100. Over the last 90 days Stax reported 4 incidents and SumUp reported 5, with effective uptime of 98.48% and 98.98% respectively. SumUp resolves incidents faster on average (19h 59m).
Data updated Nov 1, 2026 · How we score
| Metric | Stax | SumUp |
|---|---|---|
| Reliability score | 49.0 | 54.2 |
| Rank (payment processors) | #9 | #7 |
| Uptime (90 days) | 98.48% | 98.98% |
| Incidents (90 days) | 4 | 5 |
| Partial / major outages | 2 | 1 |
| Avg time to resolve | 21h 59m | 19h 59m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Stax and SumUp differ
- SumUp reported 25% more incidents than Stax over the last 90 days (5 vs 4).
- Stax had 2 partial or major outages, compared with 1 for SumUp.
- SumUp fixes problems faster: 19h 59m on average, against 21h 59m for Stax.
- Stax's longest outage on record lasted 2d 2h (Oct 27, 2026); SumUp's lasted 3h 2m (Jun 27, 2026).
90-day uptime
Stax
SumUp
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Stax incidents
- Partial outageOct 27, 2026 · resolved in 2d 2h
Affected: Settlements, Fees, and Payouts
- Partial outageOct 20, 2026 · resolved in 14h 41m
Funding Delay October 20, 2026
Affected: Settlements, Fees, and Payouts
- InformationalOct 7, 2026 · resolved in <1m
- Degraded performanceSep 28, 2026 · resolved in 49m
Affected: Scheduled Payments, Stax API
Recent SumUp incidents
- Degraded performanceOct 29, 2026 · ongoing
- MaintenanceOct 9, 2026 · ongoing
SEPA instant payments will be delayed due to a scheduled maintenance
Affected: Business Account (EU)
- Degraded performanceSep 5, 2026 · resolved in 7h 6m
Multi-Device-Sync and Kitchen Display System (KDS) are not receiving orders
Affected: Kitchen Display System (KDS), Ordering & Floor Plan
- Degraded performanceSep 3, 2026 · resolved in 6d 2h
Touchscreen not responding on POS devices
Affected: SumUp POS, POS Pro
- Degraded performanceAug 17, 2026 · resolved in 10m
Issue with Logins and Payments Acceptance
Affected: Card Readers: Solo, Card Readers: Air & 3G, Card Readers: Top & Top NFC, Logins, Tap to Pay on Android, Solo Cloud API +7 more
- MaintenanceAug 15, 2026 · ongoing
Transactions processing delay in UK
Affected: Business Account (EU)