1dollarcash is a PTC site that uses PTCPay's old GeN2 PTC script, a script which was known for bugs and security holes. This site seemed to had been abandoned by its owner for quiet some time already as the main page hasn't been updated, and the site is still selling a $2 Christmas offer in this month of September.
We can seldom find any material relating to this site, but its lack of activity is enough to mark this site as scam.
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