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by thisisit 3287 days ago
Not really, there are risks attached to it.

One of them already been pointed out - the counter-party risk. Not only can there be situation like Mt.GOX disappearing with people's money. The exchange can refuse to honor the order specially if they are the market makers.

Some brokers put a time limit on the trades. These are called Good till Cancelled (GTC) limit orders. Like Schwab has a 60 days limit for the GTC orders. I am not sure how the crypto currency exchanges work.