The ATM in Lisbon flashed two options at eleven at night: "Accept conversion — 1.94 EUR per USD" or "Continue without conversion." I'd been on the road three weeks by then, tired enough that my thumb hovered over the wrong button for a full second before I remembered the rule I'd learned the hard way in Buenos Aires two years earlier. Always decline the conversion. That extra second saved me about four dollars on a two-hundred-euro withdrawal, which sounds small until you do it fifteen times over a six-week trip and realize you've quietly paid for two extra nights somewhere nice.
Money is the part of solo travel nobody covers in any real detail. Safety checklists cover door alarms and which taxi apps to trust; packing guides cover cabin bags and layering for a shoulder-season city break. But how you actually move money across borders — which card lives in which pocket, when cash is useful and when it's a liability, how to tell a legitimate fee from someone quietly taking an extra eight percent at checkout — shapes more of how a trip actually feels than almost anything else on the list.
The Two-Card System That Finally Worked
For years I traveled with one debit card and a vague sense that fees were "just how it is." They aren't. A typical high-street debit or credit card charges a foreign transaction fee of around 2.75–3% on every purchase, on top of a flat ATM withdrawal charge that can run $3–$5 per visit regardless of how much you take out. Multiply that across a two-week trip with six ATM stops and you've handed a bank thirty or forty dollars for doing nothing but existing between currencies. A multi-currency card such as Wise or Revolut converts at close to the mid-market rate, with no markup on the first chunk of monthly withdrawals, and it's become the card I load before I load anything else onto my phone. The old-school travel credit card still earns its keep too — Chase Sapphire Preferred and a handful of others waive foreign transaction fees entirely, which makes them the right choice for hotel deposits and larger purchases where you want points rather than a converted balance sitting idle.
Set the fee-free card up two weeks before you fly, not the night before. Order the physical card early enough that it actually arrives, load it with a working balance in the currencies you'll need, and test it at a domestic ATM before you leave so a blocked-card surprise happens at home instead of at a station counter in a country where you don't speak the language. Get a Wise or Revolut card running before your next trip — the setup takes ten minutes and it's the single change that's saved me the most money over the last three years of doing this.
What Happens When a Card Gets Blocked
Traditional banks still sometimes freeze a card the moment it's swiped somewhere unfamiliar, treating a charge in Bangkok the day after one in Boston as fraud rather than a flight. Fintech cards built for cross-border spending rarely do this, since the whole product assumes you'll be moving between currencies constantly, but a legacy debit card from your home bank can still lock you out mid-trip. This is exactly why the second card matters — not as a backup in theory, but as the thing you tap when the first one gets flagged at a supermarket checkout in a country where the customer service line only operates in a time zone you're currently asleep in.
Cash Still Matters — Just Not the Way You Think
Card-first doesn't mean cash-never. Markets, small guesthouses, and a fair number of taxi drivers in cities across Southeast Asia and Eastern Europe still expect cash, and showing up without any local currency turns a five-minute errand into a scavenger hunt for a working ATM. The number that's worked for me is somewhere around $100–150 in local currency on arrival, withdrawn from an airport or city-center ATM rather than exchanged at an airport kiosk, where rates are routinely 8–15% worse than what a bank machine offers. Skip the currency exchange counters entirely if you can — they exist because tourists arrive tired and cash-desperate, and that combination is exactly what a bad exchange rate depends on. Withdraw what you need from a bank-branded ATM, not a standalone one in a currency-exchange shop or a tourist strip, since those tend to carry the steepest fees and the most aggressive conversion prompts. A modest cash reserve also means you're not entirely dependent on a card network staying online, which matters more in destinations where connectivity drops without warning.
The "Pay in Your Home Currency?" Trap
Every card terminal and most ATMs abroad now ask, at some point, whether you'd like to be charged in dollars or pounds instead of the local currency. This is Dynamic Currency Conversion, and it isn't a convenience — it's a markup, usually somewhere between 3% and 12% worse than the rate your own card would apply automatically. The terminal makes it sound like the easier, safer option, with wording designed to nudge you toward "yes." Always decline it. Choose the local currency every single time a machine asks, whether it's a restaurant card reader in Athens or a metro ticket kiosk in Seoul, and let your own bank or fintech card do the converting at its real rate instead of the merchant's inflated one.
The Scams That Specifically Target Women Traveling Alone
Most travel scams aren't random — they're built around a specific read of who's likely to feel obligated to be polite.
The friendship-bracelet approach near the Sacré-Cœur in Paris starts with a stranger tying string around your wrist before you've agreed to anything, then demanding payment once it's on. The spilled-drink or bird-mess distraction, common on Rome's tourist streets, uses a stranger's sudden concern to get close enough to lift a phone or wallet while "helping" you clean up. And the ATM version — a friendly local who offers to help you "fix" a card that seems stuck, then reads your PIN over your shoulder — shows up from Barcelona's La Rambla to backpacker strips in Southeast Asia, wherever cash machines cluster near nightlife. Some of these depend on a specific mix of guilt and gender norms that make women, more than men, feel rude saying no to a stranger's hands on their wrist or their wallet.
Money belts get recommended constantly as the fix for all of this, and I carried one for years before admitting it made things worse. Digging under a shirt at a ticket counter in front of a line of people draws exactly the attention a money belt is supposed to prevent, and it telegraphs "this is where my valuables are" more clearly than a normal wallet ever would. What's actually worked better is an ordinary-looking crossbody bag with the zip facing my body and a card + small cash split between two separate pockets, so no single grab or distraction gets everything at once.
Splitting Money So One Bad Moment Doesn't Wreck the Trip
The real insurance against any of this isn't vigilance — it's redundancy. Keep the backup card somewhere other than the bag you carry daily: a hotel safe, a hidden pocket in a second bag, or, on days with real risk of pickpocketing, a bra or waistband stash reserved for actual emergencies rather than everyday spending. Photograph both sides of every card and the photo ID page of your passport, then email them to yourself so they're accessible from any browser if your phone goes missing along with everything else. None of this depends on remembering to do it under stress, which is the point, since panic is a bad time to improvise a plan for the first time. Set it up once, on a calm afternoon before you fly, and it runs quietly in the background for the rest of the trip. A few practical habits — not a complete list, just what's worked — make the difference when something does go wrong:
- Withdraw larger amounts less often rather than small amounts constantly, so you're not standing at an exposed ATM every other day
- Keep one card's worth of emergency cash converted and untouched until you actually need it
- Save your bank's international fraud line in your phone under a name you'll recognize at 2 a.m. in a panic, and know that most fintech cards let you freeze and unfreeze the card instantly from the app, no phone call required
- Tell one person back home your rough daily location, even loosely — not for money reasons directly, but because it's the fastest way to get help if a card and a phone disappear together
Notifying the Bank — Or Not
The old advice to call your bank before every trip and list your destinations dates from an era when a charge from a different country was treated as automatic fraud. Wise and Revolut don't need this at all, since cross-border spending is the entire premise of the product, and most major US and UK banks have quietly dropped the requirement too — though it's still worth a two-minute check on your specific bank's app before departure, because a handful of smaller regional banks haven't caught up. What hasn't changed is the value of having two completely separate systems, from two separate providers, so a single fraud flag or a single blocked card never becomes the reason a trip stalls out in a currency exchange line instead of wherever you were actually headed that morning.