bitx-bitcoin (hackage): Haskell bindings to the Luno (formerly BitX) REST API, as described here: https://www.luno.com/en/api.  Note that since this library interfaces directly with a financial API, great care must be taken in its use. In particular, the author cannot be held accountable for any financial losses as a result of programming error, whether that error is in your code, the code of the author of this library, or Luno's code. This is just common sense.  If you need to make sure that nothing funny happens in the code, apart from reading the source yourself, you should also perform a few test transactions with very small denominations, as I will strive to do every time before releasing a new version.  For a very small usage example, see Network.Bitcoin.BitX.Public.
Keywords: bitcoin|bsd3|finance|library|web|api|bitcoin-exchange|haskell|haskell-bindings