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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 0.06
TRX 0.31
JST 0.058
BTC 66136.30
ETH 1986.75
USDT 1.00
SBD 0.51