Cambodia is one of the easiest countries in Asia to overpay in without noticing. Not because anyone is scamming you. Because the money system itself, two currencies running side by side, quietly rounds against people who don't know the local rules.

Here are the mistakes visitors make over and over, and the simple ways around each one.

Mistake 1: Treating Cambodia as a normal one-currency country

Cambodia runs on two currencies at once. US dollars and Cambodian riel circulate together, often in the same transaction. You can pay for a five dollar meal with a US bill and get your change back in riel. Prices in tourist areas are usually quoted in dollars. Prices at local markets are usually quoted in riel.

The confusion starts when you have to convert between the two in your head. Merchants use a rounded street rate for change, and rounding always happens in the direction you'd expect. A few hundred riel here, a few hundred riel there. It's small each time, but you pay this rounding fee on almost every cash transaction for your entire trip.

The fix is simple: know which currency the price is quoted in before you agree, and don't be shy about asking. "Dollar or riel?" is a completely normal question in Cambodia. Nobody will blink.

Mistake 2: Bringing worn or torn US bills

This one catches almost every first-time visitor. Cambodian merchants, and even banks, are famously picky about the condition of US dollars. A small tear, a heavy crease, an ink mark, or an older series bill can get refused outright. That twenty in your pocket that any shop in Chicago would take without a glance may be worthless in Siem Reap.

If you're bringing cash, bring crisp, newer bills and inspect them before you leave. And inspect your change too. If someone hands you a tired-looking dollar, you're allowed to politely ask for a different one, because you'll have the same problem trying to spend it later.

Or skip the bill-quality lottery entirely. Digital payment has no torn corners.

Mistake 3: Letting small riel pile up in your pocket

Because change under a dollar comes back in riel, cash-paying tourists accumulate a growing wad of small notes. Some of it gets spent on water and snacks. A lot of it gets forgotten in a drawer, donated to a tip jar out of exhaustion, or flown home as accidental souvenirs.

Locals cycle through small riel constantly, so it never builds up for them. Visitors don't, so it does. It sounds trivial until you count what's left at the end of a two week trip.

This is exactly the friction QR payment removes. Pay the exact amount, in the exact currency, every time. No change, no rounding, no orphaned notes.

Mistake 4: Assuming the QR codes at every counter are for locals only

Look at any counter in Phnom Penh, Siem Reap, Kampot, or Battambang and you'll see a small red and white QR code. That's KHQR, Cambodia's national QR standard, running on the Bakong system operated through the central bank. It's on coffee carts, tuk tuk dashboards, pharmacy counters, noodle stalls, and night market tables. Cambodians scan these codes all day long, often for amounts under a dollar.

Most tourists walk past this entire system because they assume it requires a Cambodian bank account or a local app. Historically, that was true, and trying to sign up for a local wallet as a foreigner runs straight into the ID verification wall that rejects so many foreign passports.

You don't need to fight that fight anymore. With Moreta Pay, you top up a wallet from your home bank or card in your own currency, then scan the same KHQR codes locals use. You see the merchant name, the amount, and the exact exchange rate on screen before you confirm, and the merchant gets paid instantly in their currency. No Cambodian bank account, no local SIM required for signup, no mental math between dollars and riel.

Mistake 5: Relying on ATMs and airport counters to solve the cash problem

Cambodian ATMs often dispense US dollars, frequently in large bills that small vendors can't break. So you withdraw cash, pay a withdrawal fee, and then discover half your money is in notes that a market stall won't touch. Now you're hunting for a minimart willing to break a fifty.

Airport exchange counters at Phnom Penh have the same problem they have everywhere: convenience priced into the rate. We've already done the math on airport exchange counters, including Phnom Penh's, and the short version is that they should be your last resort, not your arrival ritual.

Keep a little cash for the genuine edge cases (remote temple stops, the occasional cash-only tuk tuk), and let QR handle everything else. That changes how much cash you need from "a trip's worth" to "a day or two's worth."

Mistake 6: Paying online the hard way

If you're booking Angkor-area hotels on Agoda, arranging transport on Trip.com, or ordering from local e-commerce platforms while you're in the country, many checkouts offer a QR payment option. Tourists reflexively reach for their foreign credit card instead, which means foreign transaction fees and a rate their bank chooses after the fact.

The QR checkout option works with Moreta Pay the same way a street stall does: scan, review the rate, confirm. For expats settled in Cambodia longer term, the same applies to paying local bills in supported cases, no local bank account required.

A one-minute setup that fixes most of this list

Notice the pattern. Almost every mistake above (rounding losses, rejected bills, dead riel, unbreakable ATM notes) exists because visitors are stuck handling physical money in a dual-currency system built for people who live there.

Cambodia already built the way out. KHQR and Bakong made QR payment the default for locals, down to the smallest street purchase. The only thing missing for travelers was a way in.

So before your flight: download the app, verify once, connect your home bank or card, and load your wallet in your own currency. Then land in Cambodia and pay like the person ahead of you in line does. Get Moreta Pay set up before you touch down in Phnom Penh, and leave the torn-dollar inspection to someone else.