Value of any gun is based on make, model, condition. You gave us none of the 3 variables.
$100-$150
100 or so
Any handgun that is not a revolver is a pistol- so, yes, there are .22 pistols. They include single shot top break pistols, derringers, and automatic pistols. The last category includes the makes of Ruger, Colt, Browning, High Standard, Smith & Wesson, and dozens of other makers. The link below is to a photo of a Browning Buckmark pistol- caliber .22 LR.
20-100 or so
Ruger's website lists the current offerings.
50-75 USD
5-40 usd
S&w
Only if it's a .22 Long Rifle revolver. It's not compatible with the .22 Winchester Magnum Rimfire.
U.S. Pistol Company DID make a 7 shot smoothbore revolver, but it was not a starter pistol (blank gun). It fired live .22 ammunition.Do not confuse w/ US Revolver Co. (1910-1935) which was a trade name of Iver Johnson's.US Pistol Co was an entirely different firm and was owned by Otis A. Smith. The company was out of the gun business by 1899 (switching to tools) The guns were designed for low pressure Black Powder cartridges only.
There were a few different models of 9 shot .22 revolver sold by Sears under the JC Higgins brand. Value would depend on exact model, but somewhere in the $200 range.
50-75 USD