I don't have a free plan, but I offer a very generous reward for referring new customers. Some people may in fact never pay me or they may pay me but receive more money back from me.<p>* Everyone starts with 5 free transactions and test transactions do not count.<p>* If they were referred to me, they get an additional 5 transactions for free.<p>* After they use up those 10 total initial transactions and pay for credits, the original referrer gets 5 transactions for free, once, and 20% of what the person they referred paid me. This referral arrangement continues for a long time.<p>* I integrate the product into every customer's website for free to eliminate the friction of them not knowing how to do it. It's much easier to do a quick remote login than to educate customers how to do it.<p>* You can sign up to use my product by SMS. No credit cards required.<p>* I don't prevent a customer from using the product when they have zero credits. They simply don't get the product until they pay. However, I never change the end user experience.<p>* I don't charge a monthly fee and I don't charge for maintaining a mobile landing page, for which competitors charge.<p>For many customers, that initial 10 free transactions is all they will ever need. My technology quietly sits on their website and credits them for their passive referrals for clicks on my widget.<p>Due to the nature of my product, charging a monthly fee does not make much sense. The usage spikes and is difficult to predict. It made more sense to charge per transaction.<p>I am not sure I agree with the statement that you will not find evangelists among your free users. I don't pay for Apigee, Appery, Salesforce or BizSpark. I pay a modest amount to Twilio. I will talk your ear off about how great these and many other companies are.