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Some of the Airdrops are from exchanges while some are Coins or Tokens. There are coins with underlying technology or feature as well as coins with no value at all.
Only time will tell as it is difficult to distinguish now.

Coin Marketplace

STEEM 0.26
TRX 0.20
JST 0.038
BTC 97252.23
ETH 3609.35
USDT 1.00
SBD 3.85