You need to go to Agate website and you can buy Agate from there.Minimum investment is 60 dollars.
Can I buy with credit card or only with cryptocurrencies? I would like to buy more, but withdrawal fee on exchange is killing me
No, unfortunately credit card is not supported, there is simply too much troubles dealing with credit card payments.
Why is that? What are the problems with using credit cards for crypto? It would be much easier to buy tokens with credit card.
Since it is so easy nowdays to buy crypto with your credit card from various exchanges like Kraken or Coinbase,no need to involove credit cards in ICOs,it would just complicate things.And you can anwyay buy Agate with basically all major cryptocurrencies(BTC,ETH,LTC,Dash,BCH)
For new people to crypto credit card seems like an easier solution and better one, but if you scratch the surface a bit and learn you see how easy it is to get crypto and use it.