How can we license a web font from Monotype?
Monotype offers two licensing models for web fonts: “Pay as you go” and “Pay once”
1. Pay as you go The customer licenses a fixed number of page views for a specific web font. Whenever the available licensed page views have been exhausted, the number of licenses must be increased.

2. Pay once The customer licenses a fixed number of page views per month. If the number of monthly page views is greater than number of purchased licenses, the license count must be increased.

Source: EULA Monotype Web Fonts (Pay as you go), EULA Monotype Web Fonts (Pay once)