The Millistream API is a low-level, low latency Application Programming Interface (API) that developers can use to receive and publish data.

The MDF API can be downloaded via anonymous ftp from ftp://millistream.com. Binaries are available for Windows (compiled with VC6) and for a number of Linux distributions. Full source code is also available for download for those willing to compile with their own compiler or to support operating systems for which there are no pre-built binaries.