Seems like a great idea if you can keep it to a very low monthly price with excellent reliability and usability.

I might consider changing the name... Just doesn't feel right.

I would initially think to remove "HTML Snippet" from your page, just because the people that are likely outsourcing their problem reporting to you may be confused by that.

I would also look at how Google sells the simplicity of adsense to users to get them understand they are putting Google's code into their website (or some alternatives to "HTML Snippet"

I would also probably never offer a one time payment for this service. After your first month's fixed costs the early "one time fee" adopters are riding it out until the end for free.