[rdl]

I am sort of interested in doing a vertical-market payment app, similar to paypal, in a well-regulated, legal US market where paypal refuses to transact for utterly bullshit political reasons. There was a recent (2010) player who folded due to internal mismanagement/fraud, but it's fundamentally a pretty good market, and if you can launch a simple payment system in that one, you can move on to other niches.

The problem with a payment system in 2010 vs. 1995 is that credit cards and paypal are "good enough" for most applications. The only niches available are micropayments (never proven to be viable), markets incompatible with paypal or cc (square extends cc; P2P, international, high risk, porn, gaming, other banned things), or non-cash transactions (trading credits for WoW, or gigabytes of storage, etc., might be an option)