That Square Cash service that was unveiled as invite-only about five months ago? Well, its officially open to the public. As of now, anyone can send cold hard cash to anyone else just with a regular ol email address — well, an address in the US, anyway. To send money, simply send an email to the recipient with \”cash@square.com\” in the CC field and the dollar amount in the subject line. If you and your recipient are new to the service, youll both get an email from Square with a link to a secure website where you can enter in your debit card number. After that, those funds will be transferred in one to two business days. Once your debit card account is set up, any subsequent cash transaction will go through automatically. The service is absolutely free to send and receive, though youre limited to sending only $2,500 a week.

via Square Cash lets you send money over email, now open to US residents.