Poloniex is the best alt exchange, imho, and a real model for how crypto should be - they have good programmers there, they tend to focus on high-quality, innovative coins before anyone else does (not garbage clone coins) and they seem to be a lot better at hard-core development and coding/integrating new coin codes than anyone else.
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I can definitely relate to that statement. At one point, I wrote a trading bot and notice a slight quirk with their API -- it wasn't handling request/response headers with the properly casing as per the RFC spec. I reported this to busoni and he got it fixed, so yeah very good in the development and support department there.
Compare this with bittrex where I told them they need to change their max trading quantity to be based on how much btc value is being traded rather than the altcoin as a unit of account. Their response was basically that's how their system is designed and to fuck off -- much more politely of course but just amounting to generic lip service.
