Plastiq is, of course, the service that lets you pay bills where only a check is accepted with a credit card (great for meeting the minimum spend requirement for signup bonuses!) in exchange for a 2.8% fee. When the fee was lower, it was easier to justify using more broadly, but now that is the main use case.
You still can’t pay just anything with an Amex – it will have to be listed in this table.
If you don’t already have a Plastiq account, you can signup with my referral link.
PS: This doesn’t change my opinion that they are a shell of the company that they were (see my battle with them over lost FFDs), but payments are payments….
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You can find credit cards that best match your spending habits and bonus categories at Your Best Credit Cards.
New to all of this? My “introduction to miles and points” book, MilesTalk: Live Your Wildest Travel Dreams Using Miles and Points is available on Amazon and at major booksellers.