Currently, Meta Box does not have any payment option/extension on the frontend form. I'm going to inform the developer team to consider adding it to the to-do list for the future development of the plugin.
if you can learn from WP-Userfrontend, they integrated the payment subscription and pay-per-post into the post form , also custom-fields auto display on frontend, which makes their plugin a perfect tools.
In ref. to my post above, I also forgot to mention that in conjunction with the functionality above, the last missing feature that would tie this pay-to-post functionality together tightly, is the option to allow a review page before before submitting the payment processing details and the post itself (and allow the user to "go back" to edit).