I worked in SMB finance for four years. Here's the big players: 1) OnDeck (Now a public company) 2) Kabbage 3) Square (For their own customers only) 4) Payp

I worked in SMB finance for four years. Here's the big players: 1) OnDeck (Now a public company) 2) Kabbage 3) Square (For their own customers only) 4) Paypal (For their own customers only) Stripe is obviously following the Square/Paypal model which already own the customer - life is tough for OnDeck and Kabbage since the default rate for standard SMBs is so high and competition is so fierce for them across marketing channels.