Im getting these since years for many wordpress site that come up, my current guesstimate is that the larger one is a botnet communication and the smaller ones

Im getting these since years for many wordpress site that come up, my current guesstimate is that the larger one is a botnet communication and the smaller ones are simply "checks" if you autoapprove your comments. With the unique string, you have it very easy to check if your comment made it live