Hi there,
Thanks for your suggestion for free test accounts for MarketConnect services.

These would need to be connected to each vendor's test servers, but unfortunately not all of Marketplace service vendors operate such a free test environment. Therefore it wouldn't be possible for us to offer such an option for all services.

To test services for yourselves, you can place a real order and cancel it within the refund period to receive the credit balance back: https://marketplace.whmcs.com/help/connect/kb/account_and_billing/billing/refund_periods