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Take a gander at Iconomi and Game Credits.

Gamecredits is a decent name, but we are probably in a crypto bear market now, so I would be very cautious about new positions.

Coin Marketplace

STEEM 0.20
TRX 0.25
JST 0.039
BTC 97542.75
ETH 3458.83
USDT 1.00
SBD 3.15