I'm not sure if they have a worldwide offering, or if you could combine several of their feeds into one to achieve what you're looking for, but Intrinio has a pretty sweet real-time stock API that uses web sockets https://intrinio.com/financial-data/nasdaq-basic-realtime-stock-prices - the pro account access is only $175 a month.
Which worldwide stocks are you looking for? https://Polygon.io offers full US market coverage ( CTA, UTP and OTC ) feed for $199/m. I'm curious why you said "worldwide". Are you needing London or Asia markets as well?
Hopefully I can help you find what you're looking for.