Apologies for not addressing this sooner. Certain requests on our API were restricted due to abuse, currently GET https://www.bitstamp.net/api/transactions/ syntax is as follows:

Transactions

GET https://www.bitstamp.net/api/transactions/

Params:

    time - time frame for transaction export ("minute" - 1 minute, "hour" - 1 hour, "day" - 1 day). Default: hour.

Returns descending JSON list of transactions. Every transaction (dictionary) contains:

    date - unix timestamp date and time
    tid - transaction id
    price - BTC price
    amount - BTC amount


The available transaction history is thereby limited to the last 24hours. We are working to make a file available for download for the rest of transaction history.