What Stablecoins Solve — and What They Don't

Part VI · New Rails (Chapters 26–28) Builds on: Chapter 18 (the four cost items), Chapter 19 (the measuring stick), Chapter 24 (the Travel Rule), Chapter 26 (on-chain settlement) New concepts in this chapter: on-ramp / off-ramp, on-chain address screening, the last mile

This chapter pulls in nearly every concept that came before to answer one very concrete question: which leg of the route do stablecoins actually replace?

1. The Question the Previous Chapter Left Open¶

The Wise model ended on a question:

Is there an asset that can move instantly between any two parties on earth, with no pile of money parked in every country?

The previous chapter answered the first half: yes — the stablecoin. An on-chain transfer finishes in minutes, passes through no correspondent banks, and pledges no pile of money in each country along the way.

The second half is still open. The middle leg no longer parks money — but how does the user finally turn the stablecoins in hand into local currency that spends?

This chapter runs the measuring stick from the Wise model over it: where does it move the cost from, and where does the cost go?

2. Item by item against the four cost sources¶

The four cost sources made a promise: when the course reached this chapter, its four cost items would be checked off one by one. In its original order, then.

Of the four: one solved, one sharply reduced, one untouched, and one made messier.

Two more items sit outside the table in the four cost sources. They are not costs the old route had — they are changes stablecoins bring on their own:

The second row is the protagonist of the rest of this chapter.

3. A Worked Example: The Same $1,000 to the Philippines¶

Take the remittance from the chapter on no global central bank and send it down two paths.

Path A: correspondent banking (the original example from the chapter on no global central bank)

Time: 1 to 5 business days.

Path B: stablecoin

Every number in Path A comes from the real remittance in the chapter on no global central bank. Path B has no public price card to match, so the four items below take common 2026 market quotes — providers vary widely; this is for seeing the structure, not for quoting as a benchmark.

Time: minutes to a few hours.

Why the spread beats Path A's 2%: in Path A the exchange happens at a Philippine bank counter, where the user has no way to comparison-shop. In Path B the off-ramp provider typically plugs into several liquidity sources at once, so the spread sits closer to mid-market. This gain does not come from chain technology — it comes from competition. Pick a different off-ramp and it can be worse than the bank.

Compare:

Path A loss = 73.9 ÷ 1000 = 7.39%
Path B loss = 21 ÷ 1000 = 2.10%
Saved = 7.39% − 2.10% = 5.29 percentage points

Order-of-magnitude check: the World Bank puts the global average cost of remittances at about 6.5%, and digital channels at about 3.5%. Path B's 2.1% is clearly below the digital-channel average, but still in the same order of magnitude — it has not reached "near-zero cost." That is marketing copy.

4. Where It Saves — and Where It Doesn't¶

Put the two tables side by side:

In one sentence:

Stablecoins replace the middle leg of the route, not the route.

They compress the four-hop route from the chapter on no global central bank into three legs: on-ramp — chain — off-ramp. The middle leg is nearly free. At the two ends, the fiat ramps, the licenses, the compliance, the currency exchange — every one of them is still there.

So the real competition in this industry is not on the chain. On the chain leg, everyone's cost is about the same and heading toward zero. The competition happens entirely at the two ends: who has compliant, cheap, reliable ramp channels in more countries.

This is the so-called "last mile" problem.

5. What New Costs It Adds¶

Now the second half of the measuring stick from the Wise model: where did the cost move to?

The "license burden at the ramps" row deserves a pause. The Wise model said Wise traded away "slow and expensive" by paying with "capital tied up + license burden." Stablecoins cut the capital half. The license half stays, untouched — you still need compliant off-ramp capability in every receiving country.

So the more accurate statement is:

Stablecoins are not a replacement for the Wise model — they are a cost-improved version of it. They solve the prefunding; they do not solve the licenses and the channels.

6. Which Scenarios Actually Benefit¶

The analysis above hands you the stablecoin's zone of advantage directly.

The last row is a common misjudgment. Taking stablecoins into domestic retail payments means taking a solution built for a cross-border problem into a market that is already solved — users will not give up cash back and chargeback protection to save the merchant its 2%. The "what the merchant gets" table from the origin of cards applies here unchanged. Its four items: a higher average ticket, new customer traffic, certainty of getting paid, lower cash-handling costs. To win, a new solution must not lose on those four.

7. The Question This Chapter Leaves Open¶

Section 4 said it: the competition happens entirely at the two ends, and whoever has ramp channels in more countries wins.

So does every company fly to every country to negotiate its own channels, collect its own licenses, and integrate its own local banks?

That is the N² problem from clearing and settlement all over again. 100 payment companies × 50 countries, each negotiating alone.

This problem has shown up more than once in this course, and each time a solution grew around it. What shape does the solution take this time?

The next chapter: where CPN stands on the grid.

8. Self-check questions¶

1. In one sentence: which leg of the traditional cross-border route do stablecoins replace?
2. A company claims its stablecoin remittances cost "close to zero." Using this chapter's two-path breakdown, point out what the claim is dodging.
3. Why is taking stablecoins into US domestic retail payments a misjudgment? Answer with the table from the origin of cards.

9. Answers¶

Answer for yourself before reading on.

1. The middle leg — the funds-transport segment. What used to move hop by hop through a chain of correspondent banks, losing a fee at each hop and taking days, becomes one nearly free on-chain transfer. The fiat on-ramp and off-ramp at the two ends stay exactly as they were.
2. It swaps "the on-chain transfer fee" in for "the cost of the whole cross-border payment." The chain leg genuinely runs near zero, but what the user cares about is "how much I pay and how much the other side receives." The bulk of the real cost sits in the ramp fees at the two ends and the FX spread — the two items stablecoins can't touch. The test is still the one from the four cost sources: divide what the recipient actually receives by what the payer paid, compare that with mid-market, and ignore which single line item is advertised as free.
3. The table in the origin of cards says merchants accept card fees because of what they get back: a higher average ticket, new customer traffic, certainty of getting paid, lower cash-handling costs. Stablecoins in domestic retail: higher ticket — no, nobody buys more because the merchant takes stablecoins; new traffic — no, the population holding stablecoins is far smaller than the population holding cards; payment certainty — better, since transfers are irrevocable; cash handling — a wash. One win out of four, while the user side also gives up cash back and chargeback protection. The merchant's saved 2% buys no sales volume, so it doesn't move. The scenarios that do move are the ones where the existing option is genuinely bad — which means cross-border.

Previous: Chapter 26 · What Stablecoins Are: Back to the Hierarchy-of-Money Table Next: Chapter 28 · Where CPN Stands on the Grid