POS 机或网站问你"用当地货币还是本国货币付"时,选当地货币。选本国货币会触发 DCC(动态货币转换),商户方换汇时偷偷加 3%~7%。选当地货币则由卡组织(Visa/Mastercard/银联)按接近中间价换汇,几乎总是更便宜。When a terminal or website asks "pay in local or home currency", choose local currency. Home currency triggers DCC (Dynamic Currency Conversion), where the merchant's side pads the rate by 3%–7%. Local currency lets the card network convert near mid-market — almost always cheaper.
很多发卡行对境外消费收 1%~3% 的境外交易费,但如今大量"旅行卡"是 0%。出国前查一下你的卡是否免这笔费——一年多刷几笔就能差出不少。Many issuers charge a 1%–3% foreign transaction fee, but plenty of "travel" cards are now 0%. Check your card before you travel — it adds up over a trip.
走 Visa/Mastercard 且消费货币非美元时,常要先转成美元再入账,产生约 1%~1.5% 的货币转换费;而银联直接以当地货币入账、对人民币通常免这笔费。有银联标识的机器优先走银联。On Visa/Mastercard, a non-USD purchase is often converted via USD first, incurring a ~1%–1.5% currency conversion fee; UnionPay settles directly and usually waives it for CNY. Prefer UnionPay where accepted.
境外 ATM 取现时也会问"用本国货币还是当地货币",同样选当地货币,拒绝 ATM 的换汇加价。另外注意取现本身可能有手续费和利息。Foreign ATMs also offer "home or local currency" — again pick local currency and refuse the ATM's markup. Note cash withdrawals may carry their own fee and interest.
相关:DCC 是什么坑?怎么一眼识别。Related: What is DCC and how to spot it.