Arb supply is very big which will not let this token pump hard like other coins. What do you think about Arb Token? Is it a good option to take entry below 1$
$11 was the after market value before the dump so I think if it's valuated now at the price of $1 and below that, I'll grab some for sure.
or I use my fund in btc or Ethereum?
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Just don't do this, keep your btc and eth.
If you've got some other means for the funding to your ARB purchase, please don't use your eth or btc on it. But if you've got no choice and you badly want to have ARB, spare btc on the option and keep it.
So use your eth instead if you are in a dire situation and really gone out of choices.