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I have been looking for free or paid json data feeds on currencies for long.

I have come across:

  • currencylayer.com
  • Oanda
  • XE

The problem is that I really need millisecond based updates.

Can someone advice me on the way forward?

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If you want millisecond updates, you need to use technologies other than json.

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  • $\begingroup$ How does a data structure determine the rate of data? Not true at all. $\endgroup$ – Quinton Pike Sep 15 '18 at 1:36
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You could try True FX or open an account with Interactive Brokers

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There are so called mid-rate reference price providers who eventually offer newsfeeds, however, the answer will very likely be a commercial service.

The otehr path would be to contact liquidity providers and / or exchanges directly and ask for API / feed access , which again , will most likely be a commercial service.

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https://Polygon.io has FX real-time and historic APIs.

WebSockets for real-time updates, and RESTful API for historic data.

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