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Yeah did some initial research, but didn't find a good platform with an API and no fees.

You can place limit orders with no fee on GDAX/Coinbase, might not be quite what's needed though (I have zero knowledge in the area).

The main downside is that as soon as Bitcoin goes super volatile Coinbase will go down like clockwork.

Bitmex has an excellent API. 0.75% fees but -0.25% if you place limit orders (with post-only on)