Coinbase: earn some coins
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Coinbase regularly offers the opportunity to earn coins by answering a few questions to promote the coin. Once you've answered and earned the coins, you can invite others to this quiz and earn some extra coins.
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Earn for 10$ of EOS:
https://coinbase.com/earn/eos/invite/dm3761j8
(only 4 places)
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Earn for 10$ of XML (Stellar)
https://coinbase.com/earn/xlm/invite/9ymj1sgc
(only 4 places)