On 9 April 2026, the Screening service experienced HTTP 429 (Too Many Requests) errors when calling the LSEG World-Check One (WCO) API.
Following investigation, the root cause was confirmed to be on the LSEG/WCO side. The external API was throttling requests due to concurrent request limits enforced on their end.
Specifically, the throttling was enforced by LSEG’s WCO API infrastructure. The platform applies a concurrent request limit per API client. When this limit was exceeded - primarily due to a high volume of simultaneous screeningRequest calls - the API began rejecting requests with HTTP 429 responses.
This is an LSEG/WCO platform-side constraint, not an issue in the Fenergo Screening service.
The LSEG team reportedly notified all clients with the following communication:
Subject: World-Check One API - Real Time Screening Was Disrupted For Some Customers Globally |
Alert ID | 373551 | Alert Status | Resolved |
First Reported | 09-April-2026 12:12 GMT | Outage Start | 09-April-2026 10:00 GMT |
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| Actual Resolution | 09-April-2026 11:35 GMT |