The following are snippets of Peering Policy Clauses found in the Peering Rules of the Road - A Brief Study of Peering Policies study.  Clauses were categorized and put into rough categories for comparison.

Here are the clauses we categorized as the availability of Paid Peering

Excerpts from Peering Polices

If these requirements are not met, then a Paid-Peering arrangement can be made. – Cox

Applicants not matching this policy may apply for a Paid Peering. – tinet

Networks that do not meet the requirements of the settlement-free interconnection policy, but remain interested in Comcast dedicated internet access services may also address their requests to peering@comcast.com.  In this case the subject line of the e-mail should indicate a need for sales assistance.  The body of the message should include as many details as possible, such as location and telephone number, to expedite the redirect for assistance. – Comcast

Networks that do not meet the requirements of the applicable peering policy but that are interested in AT&T dedicated internet access services may also address their requests to peering@att.com. In this case the subject line of the e-mail should indicate a need for sales assistance. The body of the message should include as many details as possible, such as location and telephone number, to expedite the redirect for assistance. -- AT&T