Two opposite trends define modern payments. Within a country, moving money is becoming instant and always-on. Between countries, it can still take days and cost a fortune. Understanding both — and why they differ so sharply — is the heart of this lesson.
The rise of instant domestic payments
For decades, retail bank transfers settled in batches (like ACH), taking a day or more. That is changing fast with instant-payment rails: FedNow (US), SEPA Instant (Europe), UPI (India), Faster Payments (UK) and their peers. Their common promise:
- money arrives in seconds, not days;
- 24/7/365 — no bankers' hours;
- with immediate finality — the recipient can rely on it at once.
Under the hood they lean on the central-bank settlement layer from Foundations (often real-time gross settlement, RTGS, so each payment settles individually with no lingering risk). India's UPI shows the effect at scale: instant, near-free payments became the default for a billion people, largely bypassing cards.
Why crossing a border is hard
Now the hard part. There is no single global ledger and no world central bank. A bank in Brazil has no account at a central bank in Japan. So to pay across borders, banks use correspondent banking: Bank A holds an account at Bank B in the other country (from A's view a nostro account — "our money with you"; from B's view a vostro — "your money with us"). A payment hops along a chain of these relationships, each hop adding time, fees, and its own compliance checks. There may be no direct relationship, so the money threads through several intermediaries.
SWIFT: messages, not money
A common misconception: that SWIFT moves money. It does not. SWIFT is a secure messaging network — the standard way banks tell each other "please pay this amount to this account". The actual value still moves through the correspondent accounts above. That separation of messaging from settlement is why a cross- border payment can be "sent" instantly yet take days to arrive, and why it is opaque about fees along the way.
This friction is exactly what a wave of new approaches — real-time cross-border schemes, and blockchain-based settlement — is trying to remove. That frontier, and the fintech stack being built on all this plumbing, is the final Core lesson.