With European stocks tumbling, it was only a matter of time before someone pulled the biggest circuit breaker of all, i.e., the plug. And sure enough:

EUREX SAYS IT DOESN’T CURRENTLY HAVE STOXX UNDERLYING PRICES

EURO STOXX 50 AND STOXX 600 HAVE NOT CALCULATED FOR 50+ MINS

DEUTSCHE BOERSE SPOKESWOMAN CONFIRMS STOXX 600 NOT CALCULATING

And from the exchange:

Emergency Information Failure STOXX underlying feed Due to technical problems with the price data feed, the Eurex system does not currently have STOXX underlying prices. Please do not hesitate to call Market Supervision for any questions you may have. Aufgrund technischer Probleme beim STOXX Preisdatenstrom werden derzeit die Basiswertpreise nicht aktualisiert. Sollten Sie Fragen haben, wenden Sie sich bitte an Market Supervision.

Market Supervision +496921111210

We expect the exchange to promptly fix itself just as soon as a bid reappears, because for now futures are fading fast...