The UK ETA app has no way to opt out of MCC. The £10 fee came across at $13.07 since I indicated I was applying from the United States. Based on the exchange rate, it looks like it's a 4.25% conversion fee. I don't know how to dodge this fee unless you're applying from another place that uses the pound (or perhaps applying for renewals from within the UK, if possible).

What if you indicate you’re applying from the UK even though you’re not? I had to do that for my UK card to be run in GBP.

I really rather not lie on an immigration application.
But it seems Home Office has abused Majuki ’s honesty.

As a side note, my attempts to circumvent Chrono24.com’s attempts to force MCC wasn’t successful https://www.flyertalk.com/forum/cred...l#post36728923 . That’s why I was grateful the seller offered to relist the item I wanted on eBay, said it works better for him too:

https://cimg5.ibsrv.net/gimg/www.fly...5dba76851.jpeg

Can you confirm that Bank Pekao ATMs in Poland did not charge any fees, or am I misunderstanding?

Yes, Bank Pekao did not charge any fees, didn't ask for DCC either. Just choose the amount, and it went through

The transactions posted on my bank account . Preauth and transaction data matches the visa.com rate with 0% bank fee.

Restaurant in Paris showed a charge of 148 euros on machine. I tapped with my phone. Charge came through in dollars, about a 4% surcharge with no prior warning. Restaurant said it couldn't do anything. Can I get any satisfaction from Chase, the issuer ("I was charged more than expected")?

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Chase is pretty good about it. Complain that you were not given an option to pay in the local currency and that you were assessed a conversion fee from Euros to Dollars.

I followed the advice in this thread and submitted to Chase with issue, what conversion should have been vs what it was, difference in USD I was ripped off, and within a day or two had a credit, no questions asked.

How did you determine what the conversion should have been (the Visa exchange rate calculator https://www.visa.co.uk/support/consu...alculator.html requires specifying a bank markup)? Is there anything else I should be writing? The closest Chase menu option for the problem seems to be "I was charged more than expected" if I'm reading correctly.

The bank markup is 0%, assuming you used a card without foreign transaction fees. You can determine based on the transaction date what the charge should have been.

I either used an online tool or another Visa transaction from the same day that did not have DCC to determine a rate. In my message said I specifically declined conversion, was forced, rate should have been X resulting in $xxx USD, but they used rate Y resulting in $yyy USD charge, and requested the difference back. It was small, but I hope it resulted in a chargeback to the merchant. There is no bank markup on my Visa card. I didn't use a form, used secure messaging at chase.com

Why did you do message instead of credit card form?

I didn't see a form for DCC issues. I just used Chase secure messaging about the card in question. At the time that was also the rec in a FT thread. Assuming I didn't miss it, maybe they've had enough of these complaints to create a form? I've found the secure messaging is pretty quick results with Chase. Now that I am thinking about it, I may have disputed the transaction and sent a secure message. But I never saw a form to fill out

Sounds as if the way to go is disputing and if there isn't a space to explain sending a secure message. The best dispute choice appears to be "I was charged more than expected".

If you or others have a better idea, please let me know.

I found my post in this thread https://www.flyertalk.com/forum/34796149-post949.html
I chose the charged more than expected. After submitting I also send a secure email explaining the issue and math and referencing my dispute. They did reply to confirm the credit would stick.