Budiony Damyanov

Counts the visits from web spiders, crawlers and bots in your blog, with ability to get the blog rankings from Google or Alexa. 
Also can count any other visit, the plug-in is looking for patterns in user-agent string, which pattern can be customized. 
You can block or unblock crawler, spider (or any other item), by IP address and identifier via .htaccess file. 
As additional information you can get your blog rankings from Google PageRank or Alexa.

bodi0`s Bots visits counter

Counts the visits from web spiders, crawlers and bots in your blog, with ability to get the blog rankings.

Stefano

This plugin is not required anymore. From Post Pay Counter v2.780 (2023-06-07), Slimstat and other visits trackers are supported natively without need of extra addons.
This little addon allows integration of WP-Slimstat visits data with Post Pay Counter. This way, you will be able to use Post Pay Counter to pay your writers per visit using the tracking functions of WP-Slimstat.
Requires both <a href="https://wordpress.org/plugins/post-pay-counter/" rel="ugc">Post Pay Counter</a> and <a href="https://it.wordpress.org/plugins/wp-slimstat/" rel="nofollow ugc">WP-Slimstat</a> (both free).

Post Pay Counter – WP-Slimstat visits

Allows integration of WP-Slimstat visits data with Post Pay Counter.

bodi0`s Bots visits counter vs Post Pay Counter – WP-Slimstat visits