A subscription buys tailored estimates of demand for new bonds, including the interest rate the market is willing to bear. This helps corporate treasurers gauge market conditions and decide when to issue bonds and in what maturity. Of the 200 or so Canadian corporations that issue debt frequently, 81 are signed up.

https://www.economist.com/finance-and-economics/2018/05/12/a-canadian-startup-applies-machine-learning-to-corporate-bond-issuance