Square and its competitors have empowered small businesses to accept credit and debit cards using hardware and tablet apps, but Flint Mobile makes things even easier by dispensing with the hardware. Instead, its iPhone app scans a MasterCard or Visa credit card number (but no other info), and submits it along with customer-provided verification information and signature to Flint's payment gateway partner.
Funds are typically deposited to the merchant's bank account within two business days (minus a transaction fee of 1.95 percent plus 20 cents for debit cards, or 2.95 percent plus 20 cents for credit cards). Additionally, Flint generates customizable e-mail receipts with buttons for posting about your business to social networking sites. You can sign up now for an invite-only beta.