There is no embedded XtraDB.
HailDB is your best shot.
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Flat-rate 24x7 support for MySQL <http://percona.com/mysql-support>
If you're wanting an API such as the HailDB API, that could be possible
by porting the XtraDB patches over to HailDB. The quickest route for
that is 5.1 based XtraDB... While I don't have any immediate plans for
that, you could (of course) engage my employer (Percona) to make it
happen for you :)