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Re:Coinbase – Exchange API by clarkmoody on Monday January 26, 2015 @10:14AM (#8947357)
The API specifies how to poll once and use the streaming data feed to keep an accurate state of the order book on the client side.

So it's not really a polled API, for serious clients.

Re:Coinbase – Exchange API by mrchicity on Monday January 26, 2015 @10:22AM (#8947411)
Thanks for the correction. You're right.

If one of these guys provided a more traditional fix/itch/ouch setup, they might get more traction with traders who are already active in other currencies/products.

Re:Coinbase – Exchange API by jzwinck on Monday January 26, 2015 @10:16AM (#8947368)
Indeed. The WebSocket API is described here: https://docs.exchange.coinbase.com/#websocket-feed