Edit: Payoneer is now available for all accounts. You can learn more here: https://itch.io/t/654159/payoneer-now-available-for-all-accounts
We're currently experimenting with bank transfers with a few people. It's a lot more overhead for our small team so it's likely it will be restricted to sellers making over a certain amount. If you'd be interested in using it send us an email.
As for Square Cash, I looked into it briefly at one point, but it doesn't look like it's designed for handling payouts from a business, in addition to not having an API.
Lastly, I also looked into Google Wallet and it seemed like they also didn't have business integration for paying people.