Hi Husafan, I'm working on a micropayments startup, we're not operational right now, but I researched a lot of alternatives :) so I'll list some:

BuySimple https://www.buysimple.com/ is the one I liked the most (and the one most similar to my own service)

There are a lot of SMS micropayments services with a very high per-transaction cost:

http://www.daopay.com/?language=es

http://www.boku.com/

http://zaypay.com

A trade website:

http://www.thepaypers.com/

Other stuff I haven't tried:

https://checkout.google.com/inapppayments/

There are dozens of others