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Upvoted because of the use of AWS Lambda instead of a cron job, I believe Bitstamp offer such a feature as there is clearly demand for DCA :)

Coinbase already has, but with 1.5% fee!!

How do you make sure the transaction happens? What if my order doesn't get executed, and then 5 of them executed next week then it's not DCA anymore.

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AWS Lambda appeared to be a nice method for task scheduling. In any case it is very cheap I only get billed for like 400ms per day. Other services like KMS came in quite handy as well - for instance to encrypt Bitstamp credentials in the configuration.

Right, 1.5% fee is ridiculous. Bitstamp charges 0.25%, that is ca. 2 cent for €5.

There are no guarantees that transaction will actually happen. But since the order goes to the last ask price, it is very probable that it will. I run this for a few days already, it always worked out so far. I also think that if the order is not executed for 24 our, Bitstamp will automatically cancel it (not quite sure, however).

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