http://www.paybycash.com/ is the one that ask for $50,000 yearly minimum "Due to the rising popularity of our service, we currently require that new merchant clients be forecasting sales of at least $50,000 USD or the equivalent in your native currency.", they seem to have no monthly fees.
About their pricing: "You can obtain current rates for PAYBYCASH pricing for handling payments for any Merchant that PayByCash processes alternate payment options for by selecting to pay via PayByCash from the Merchant’s Point of Sale page, or by clicking on other links on the Merchant site designated for use by Consumers seeking to use PayByCash. Clicking on these links redirects you to the PayByCash site, where the amount due for that particular transaction will be clearly displayed."
PayByCash and UltimatePay seem to be the only versatile payment solutions (by which I mean you don't have to separately implement all small ones like wally card and can use local payment solutions in many countries) on this planet... If you know more of these please post.