They have a completely separate model line (Vive) intended for commercial installations with a totally different model hub which does have RF inwall outlets, but it doesn’t have a smartthings integration.
The Caseta Smart Hub that works with SmartThings doesn’t have any wall outlets. they do offer two Caseta smart plugs that plug into a wall socket: one which is dimmable (one of the only smartplugs on the market that is) and an outdoor rated smart plug which is not dimmable.
Some people will connect a Caseta switch to the dumb outlet and then you can control the switch, but unless you already planned to do that you’re adding more wiring costs.
(Lutron also makes designer dumb outlets if you want to match the style when using the switched outlet method.)
NON LUTRON BRANDS
Of course, if you are using a SmartThings account, you can use a different brand of inwall smart outlet. GE/Jasco and Leviton are probably the most popular. The GE are either zwave or Zigbee. Leviton offers zwave, Zigbee, or WiFi. The Leviton Wi-Fi outlet is popular for those who do not have a Smartthings/Aeotec hub.
Another option is to get an in wall relay module and connect it to the in-line wiring at a junction box, rather than trying to replace the dumb outlet. This can work, but read specifications carefully. Lutron doesn’t make any modules of this type, but there are many manufacturers that do and you will have a choice of protocols: zwave, Zigbee, or Wi-Fi.
PROBABLY ONLY ONE SOCKET IS RF-CONTROLLED
Almost all smart inwall receptacles have only one outlet which is RF controlled. The other is an always on typical dumb outlet. So that’s just something to be aware of.
Send manufacturers put the controllable outlet on the top and some put it on the bottom, but there’s usually an on/off button for the RF socket in the middle.
THE GFCI ISSUE
Also, by their nature, most Smart inwall receptacles cannot be GFCI. That’s because the smart outlet needs to always have power so that the radio will work while GFCI is designed to cut power completely. So if you have a location like a bathroom where you need to have a GFCI outlet, there are two common options: put a smart module on the branch circuit upstream from the actual outlet, or use a smart plug in module, leaving the original dumb GFCI receptacle in place.
As @Paul_Oliver notes below, Leviton just released a new “industry first” WiFi model a few weeks ago which does have GFCI, but I don’t know whether it works with smartthings or not.
Read model specifications carefully! For a typical US home, small appliances like vacuums or fans may go up to 15 A, but many smart plugs can only handle 10 A. Or aren’t designed for motor devices at all, only lighting.
Also, be aware that manufacturers that create models for the European market may describe a device as being suitable for outlets or fans (show pictures) but they are talking about devices with a draw of about 8 A, way lower than the typical US setup.