Love the idea. Totally understand the business use case. Not in love with the pricing.

Feels like paying $49/mo is too high for a marketer to try out, but too low for the fact you can run an effective DDoS of some sites with it

I'd suggest changing the buckets - up to 10 monitored pages on free, a Silver Tier of maybe $29/mo of up to 100 pages + frequency of as low as hourly, a Gold Tier of maybe $99/mo of up to 1000 pages w/ minute frequency, Zapier integration, better support, etc, and then a call-for-quote tier like you already have