Travel tip: don’t carry just one credit card, even if it’s an international card. Some places might not take your brand. Example: American Express is great but not accepted everywhere. Also have a visa or a Mastercard. 

Seems visa accepted more places. 

And be sure to get one with no Int’l fees or conversion charges.

Whatever your decentralized, borderless, neutral, censorship-resistant open blockchain question is, the answer is YES… to Crypto!

What I often hear is that AmEx charges quite a hefty percentage per transaction, so a lot of shops don't want it, cause it eats from their already not big margins. I think traveling with a Visa is a better idea. They tend to charge a lump sum per month, so more transactions means a lower per-transaction fee.