According to Swimming World Magazine Ryan Lochte's prize money so far is $9,500

Gender       Name                    1st              2nd               3rd               Total

Male

Ryan Lochte

USA

1.5

$7,500

0

$0

1

$2,000

$9,500

The prize money for SC Worlds is:  $5,000 for first place, $3,000 for second place and $2,000 for third.  The relays are awarded a single prize, which is split four ways.

Ryan's results are:

200 Free - 1st (1 x $5,000)
100 Fly - 3rd (1 x $2,000)
400 Free Relay - 1st (.25 x $5,000 = $1,250)
800 Free Relay - 1st (.25 x $5,000 = $1,250)

$9,000 Total

The entire chart is here:  http://www.swimmingworldmagazine.com/lane9/news/World/32905.asp