Is there a World-Wide Stock Market real-time quotes Application Programming Interface (API)?

Well, there are Thomson-Reuters and Bloomberg very very expensive, but comprehensive global coverage, both real-time data and fundamental stuff. Morningstar acquired real-time data provider tenfore recently. They are almost as comprehensive as the previous two, but slightly more afforable.

All three have real-time "solutions" (these big words is what you pay for) that provide a nice (or at least workable) API. I have used them all, and they all have their issues and niceties. In my experience, if you can convince one of their salespeople of your potential as a customer you can generally get a trial for a month or so.

Ask to get the API documentation before the trial starts so you can hit the ground running and by the end of the month you will be able to determine if the high price is worth it.

You should have a look at the web services provided by Xignite. They have a global quotes service that has many of the exchanges (although perhaps not all) you have asked for.

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