Moving money
across borders

Your money doesn't travel — it hops between banks that don't trust each other.

There is no single global bank. When you send money from Switzerland to the Philippines, no wire physically crosses the ocean. Instead, a chain of correspondent banks each update their own private ledgers, passing an IOU down the line.

Each hop adds a fee, an FX spread, a compliance check, and a delay. Because every bank keeps its own separate book, they reconcile with each other in batches — which is why a payment can sit "in transit" over a weekend. The system was designed in the 1970s (SWIFT) and still works on banking hours.

The cost isn't the moving of data — it's the cost of institutions that don't share a ledger reconciling their separate ones.

The world sends $905bn home a year — and loses ~6% in fees.

Remittances are a lifeline for low- and middle-income countries. India alone received about $129bn in 2025; Mexico $68bn; the Philippines and many smaller economies depend on these flows for a large share of GDP.

The World Bank's global average cost to send $200 was 6.36% in Q3 2025. Banks are the worst channel at almost 15%. The UN's official target — set for 2030 — is just 3%. Every percentage point is roughly $9bn a year taken out of the pockets of the world's lower-income households.

One shared ledger replaces the chain of private ones.

A stablecoin is a token that always equals one dollar (or euro), fully backed by reserves held by the issuer. Because it lives on a public blockchain, every participant reads from the same ledger — so there is nothing to reconcile.

The sender converts cash to the stablecoin (the "on-ramp"), the token moves directly to the recipient's wallet in seconds, and the recipient converts back to local cash (the "off-ramp"). The settlement step in the middle — the part that used to take days and a chain of banks — becomes a single ledger update.

• USDC / USDT — dollar stablecoins, the most used rails today
• 24/7 — no banking hours, no weekend gap, no cut-off times
• Final in seconds-to-minutes instead of 1–3 business days

Crucially, the blockchain only fixes the settlement layer. The on-ramp and off-ramp — turning cash into tokens and back — still carry FX and withdrawal costs. That's why stablecoins beat banks in some corridors and not others.

Same $200, two payment systems, side by side.

Press play. Watch the correspondent-banking route hop bank-to-bank with fees and delays, while the stablecoin route settles on one shared ledger.

It depends on the corridor. Model it yourself.

Pick an amount and a corridor. The calculator compares a typical bank wire, a digital money-transfer operator, and a stablecoin route (including realistic on/off-ramp costs). Notice how the stablecoin advantage shrinks for small amounts — because the fixed off-ramp fee dominates — and grows for larger transfers.

Illustrative model for teaching. Bank ≈ 9.5% + $15 fixed; MTO ≈ 4.6% + $1.50; stablecoin ≈ network fee + on-ramp ~0.5% + an off-ramp that has both a % spread and a fixed cash-out fee — and that fixed fee is what makes small transfers on thin corridors lose.

Roughly $400bn settled via stablecoins in 2025.

This is no longer a thought experiment. The Bank for International Settlements estimates around $400bn of cross-border value moved via stablecoins in 2025 — about 7% of cross-border flows and rising. Adoption is strongest exactly where the old rails are worst: Latin America, sub-Saharan Africa, and parts of Southeast Asia.

Where this case is weaker than the hype suggests.

A balanced view — because your students should be able to push back on a salesperson:

• The last mile is still hard. Most recipients want local cash. If the off-ramp is illiquid or expensive, the on-chain savings evaporate.
• Volatility risk sits with the issuer. A stablecoin is only as stable as its reserves. A de-pegging event (as in 2022–23) can wipe out the "stable" assumption mid-transfer.
• Regulation and compliance. KYC/AML still applies. Many corridors lack legal clarity, which raises costs and limits who can build ramps.
• Most stablecoin volume is not remittances. A large share is exchange and trading activity, not workers sending money home — so headline volume overstates the consumer use case.

The technology genuinely fixes settlement. It does not, by itself, fix currencies, regulation, or the cash-out problem — and that's exactly the nuance worth teaching.