@mike1995

When I went to the border at Lewiston they accepted credit cards. My understanding though now is that the rate has gone up considerably so you should verify with the port of entry. Here is the list from their site:
https://www.cbp.gov/travel/international-visitors/admission-forms/form-i-192-form-i-212-and-form-i-824-designated-ports-entry

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In my case they even accepted a "Visa Debit" card as issued by CIBC. However, as they say, cash is king and you're golden.

@mike1995

You can pay with a credit card or you can pay with US currency. I just went to my bank in Toronto and withdrew US dollars.