Plastiq is a service that lets you use a credit card to make payments toward student loans, auto loans, mortgages and other things you normally can't use a credit card for.
They normally charge a 2.5% fee on each payment, meaning it is only worth it if you are hitting a minimum spend for a credit card sign up bonus. They also have deals every so often to pay a 1.75% fee when using a Mastercard.
They just implemented a referral program with the following conditions:
Sign up through a referral link, make a $20 payment (costing you a 50 cent fee) and they'll give you $200 in Fee Free Dollars. Note: This does not mean they are giving you $200. It means they are allowing you to send $200 via your credit card without paying a fee. This means you save $5 in fees on that $200 of spend.This can be a great way to help hit a minimum spend if your expenses are otherwise low.
If you'd like to sign up through my link to get $200 "fee free dollars", it is here:
https://try.plastiq.com/264149Edit: Today only (3/23/2016) you can also get another $25 in fee free dollars by sharing your link on Facebook or Twitter and tagging Plastiq. Their Twitter handle is @payplastiq