We are currently opening up our HTTP API to more users of the exchange. Please note that trading through the HTTP API is subject to our Pro Tier commission band where 1% commission is charged on winnings or losses per each individual bet that settles, and order rate is limited to 1 bet/s. You can review relevant documentation here.
The Smarkets Streaming API is available for market makers only and is subject to commission equal to 20% on lifetime P&L.
If you would like to access to either of these two services, you can apply by outlining your proposal here.