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I have a similar problem adding 0x project tokens in Metamask. I put the token address, 'ZRX' symbol, and tried with different numbers for decimals of precision. It always ends up with 'no tokens added' message.
Any solution?

No, I have not tried with 0x. Ask 0x team about it. If it's ERC based token, it should work.

Metamask isn't allowing me to send the ZRX to another address. It's listed, however, it won't allow me to send anything but the ETH in my wallet... smh . Any idea how to do this?

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