The rate was 1/s as recently as 2015, I implemented it into
DHG in 2015 and verified it as 1/s then at some point earlier this year they limited free accounts to 25k calls a month and the Pro account to 1/10s.
Also Moz have recently made you sign up to a "community" account to use stats in their browser extension. If you add in the fact that Moz have "monthly" updates compared to Majestic's more fluent continually updated index it is harder to trust the stats.
Now let's consider reliability a bit, in the past year they have missed at least 2 of their scheduled updates entirely. One of these updates completely screwed up stats on all web2.0 accounts which meant for a lot of people the entire service was completely useless for an entire month.
And my experience as a customer of their API service has been pretty terrible also. I have had more than one IP address blocked completely without notice despite all calls from them being fully paid for and legitimate API calls.
I cannot say that I have a whole lot of positives to say about Moz and how they have been running their business this year, not when compared to Majestic.
Sorry about the rant, I don't really know where that came from.