Open banking APIs are generally reliable, but not uniformly so. Banks must measure and publish availability and performance under the Operational Guidelines, which require at least 2 availability KPIs and 4 performance KPIs per dedicated interface. Reliability still varies by bank and over time, so a good provider measures it and routes around problems, and you design a fallback.
What the Operational Guidelines require
The Operational Guidelines set measurement obligations on banks for their dedicated interfaces. A bank must publish at least two availability KPIs and at least four performance KPIs per interface, aligned with the European Banking Authority guidelines the UK rules draw on. The point is that these are transparency and measurement requirements, not a single guaranteed uptime number: banks must show how they are doing, which lets you compare them and hold them to account. See the standards tracker for the current Operational Guidelines version.
Where performance stats are published
Two sources help. Each bank publishes its own availability and performance figures, and Open Banking Limited publishes ecosystem-wide API performance information. Together these let you see how a given bank performs and how the ecosystem performs overall, which is useful both for setting expectations and for spotting a bank that is consistently weaker, information your provider also uses operationally.
Realistic expectations
Open banking is reliable enough to build a business on, but you should expect high availability rather than perfect availability, and some variation between banks. Occasional downtime at a specific bank is normal; what matters is that it is measured, usually brief, and handled gracefully. Setting this expectation with your own stakeholders avoids treating a transient bank outage as a failure of open banking itself.
How a provider mitigates bank downtime
- Monitoring across banks, so problems are seen quickly.
- Sensible retries with backoff for transient failures, as covered in error handling.
- Graceful degradation, so a single bank's outage does not break the whole journey.
- Clear status back to you, so you can decide what to show the customer.
You cannot fix a bank's downtime, but a good provider minimises its impact and tells you clearly when it happens.
What to put in your SLA
Your service-level agreement is with your provider, not the banks, so frame it around what the provider controls: their platform's availability, their support response times, their monitoring and incident communication, and their approach to bank downtime. Ask for their measured performance, not just a promise, and make sure the agreement covers how you are told about and supported through incidents. See choosing a provider.
From the data consumer's side
Two practical habits matter. First, always offer a manual fallback so a customer whose bank is briefly down is not blocked. Second, judge reliability on measured figures, your provider's and the published bank data, rather than assumptions. Reliability is a provider and operations question as much as a protocol one, and it is worth putting in your SLA.
How Credit Canary does it
Credit Canary monitors bank performance, retries and degrades gracefully, and surfaces clear status so your journeys cope with the occasional bank outage. Availability and support expectations sit in the agreement, so reliability is measured and accountable, not assumed.
Common questions
How reliable are open banking APIs?
They are generally reliable, and banks must publish availability and performance figures under the Operational Guidelines, but reliability varies by bank and over time. A good provider measures it and routes around problems, so expect high but not perfect availability.
What availability must open banking APIs meet?
The Operational Guidelines require banks to publish at least 2 availability KPIs and at least 4 performance KPIs per dedicated interface. These are measurement obligations rather than a single guaranteed uptime figure.
Where are open banking API performance stats published?
Banks publish their own figures, and Open Banking Limited publishes ecosystem-wide API performance information. These are useful for comparing banks and setting realistic expectations.
How do you handle open banking API downtime?
A provider mitigates downtime with retries, monitoring, and fallbacks, and you design your journey with a manual alternative. Put availability expectations and support response times into your SLA with the provider.
Related pages
Primary sources
- Operational Guidelines v4.0.1, availability and performance (checked 14 Oct 2026).
- openbanking.org.uk, API performance (checked 14 Oct 2026).
Credit Canary provides open banking through fumopay limited, an FCA-authorised account information and payment initiation service provider (FRN 925689), of which Credit Canary is an agent. Underlying bank connectivity is also provided by fumopay limited. This page is an evergreen reference and is reviewed and dated; it is not regulatory, legal or financial advice.