Live-Rates.com
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Accuracy and speed is good. Customer Support could be better.
I searched all of their public web pages but couldn't find an email address or social media where I can contact them directly. There only was a contact form on the bottom of the landing page. I sent a message through that form, but got no reply. EDIT: They responded and offered a 4-day trial. I tested the WebSocket API and I can confirm that the price data for most of the assets are accurate and the latency is good too.