Monerica is currently using NOWPayments. This has been good as there are no monthly fees and it's all on their side. But it may soon make more sense to self-host a Monero payment processor. Some sponsors would prefer something else.
It's very hard to get a straight answer about what it will cost per month and how to host everything while also paying in Monero. Ideally this is done as a full node but it's perhaps too expensive to do that and would be best as a pruned node or remote node.
What exactly would this cost and which specific software to run? It would most likely be from the list of open source merchant services on Monerica (e.g. Bitcart, BTCPayServer, etc.). Options like MoneroPay are interesting but they require more setup and having an external price API rather than one built in, or easily configured.
Any specifics on price and configuration could help justify the time to switch.
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