There’s a common picture of international banking: your money gets loaded into something called SWIFT, which flies it to the other country. It’s a tidy picture and it’s wrong in a way that matters. SWIFT never touches your money.
Reality is a bit like a postal system with separate vaults. One network carries letters. Other networks, and a lot of bookkeeping between banks, move the actual value. Once you can tell the letters from the vaults, most of the confusing things about cross-border payments (the delays, the odd deductions, the “where is my money” feeling) become easier to read.
SWIFT is a messaging service
Swift describes itself as a secure messaging system that helps financial institutions send payment instructions. It says plainly that it doesn’t move money. Banks and other institutions carry out the actual transfer of funds. It’s a cooperative society under Belgian law, owned by its shareholders, and says it has been going since 1973. On its own site it cites more than 11,500 members and over 12,500 connected institutions across 220-plus countries and territories. (The page doesn’t explain why those two counts differ, so read both as rough.)
So when someone says “my wire went through SWIFT”, they mean a message went through SWIFT. A bank typed an instruction: pay this amount to this account at that bank, with this reference. The message is the letter. The vault is somewhere else.
Where the money actually moves
Money between banks moves by changing numbers in accounts. Two banks with an account at the same third party, or at the same central bank, can settle by moving a balance from one line to another. Nothing physical travels.
Inside a single country or currency area, banks share common rails: payment systems built for that job. Three examples show the range.
SEPA (euro area and neighbours). The European Payments Council says its SEPA credit transfer can be used for euro payments in 36 SEPA scheme countries. It’s a euro scheme. Send in euros between two accounts in the zone and you’re on a domestic-style rail even though you’ve crossed a border. There’s an instant version too. Under the EU’s Instant Payments Regulation, euro-area providers have had to be able to send instant payments since 9 October 2025, and the stated aim is under ten seconds, any time, any day (dates and the ten-second figure per Finextra’s summary of the regulation).
Faster Payments (UK). Pay.UK describes it as the UK’s 24/7 real-time payments service. In February 2022 the maximum per payment was raised from £250,000 to £1 million, though each bank sets its own limit, so your own ceiling is likely much lower.
ACH (United States). Nacha says the network is open 23¼ hours each business day, settles four times a day, and reaches all US bank and credit union accounts. Same Day ACH began in 2016 and the per-payment cap is currently $1 million. It’s batch-based and tied to Federal Reserve hours, so a Friday evening payment may not move until Monday.
Here’s the catch: these rails are domestic or regional. A UK pound payment on Faster Payments can’t be pushed straight into an Indian rupee account. Something has to bridge the gap.
The bridge: correspondent banking
The Bank for International Settlements’ payments committee defines correspondent banking as an arrangement where one bank (the correspondent) holds deposits owned by other banks (the respondents) and provides payment and other services to them. Think of it as an account one bank opens at another so they can do business, usually in a currency the first bank doesn’t otherwise have access to.
Its report walks through a simple case. Bank A and Bank C have no accounts with each other, so Bank B sits between them. Bank A debits its customer and credits the mirror account it keeps for B. It sends B a payment message. B debits A’s account and credits C’s account. B passes the message on to C. C credits the final recipient.
Two things travel in parallel: the message (via SWIFT or something like it) and the value (via bookkeeping at B). If you were drawing this, you’d draw two lines. One is a letter passing from A to B to C. The other is a set of ledger entries at B. Same trip, different pipes.
That report also admits there can be further banks on the sending and receiving sides, and that correspondent relationships are seen as increasingly costly to set up and maintain, largely because of compliance work. That cost pressure is part of why the number of banks willing to be a bridge for a given currency pair is smaller than you’d guess, and why the chain for an unusual route can be longer.
A worked example, with made-up numbers
Say a made-up bank in Lisbon (call it Bank A) sends a customer’s 2,500 USD to a made-up bank in Nairobi (Bank C). Neither has an account with the other. Both do have US-dollar dealings with a big US bank (Bank B). All figures are illustrative.
- Bank A takes 2,500 from its customer’s account and instructs B to pay C.
- B moves 2,500 from A’s dollar account to its own books in favour of C, and takes an 18 USD handling charge on the way. 2,482 is passed on.
- C receives the message and the value, takes a 10 USD incoming charge, and credits the recipient.
So the recipient sees 2,500 – 18 – 10 = 2,472 USD. The sender’s confirmation said 2,500 left. Nobody lied, exactly. Each party took its cut at its own step, and the sender only saw the first. (How these deductions are labelled and how to prevent them is the subject of the separate guide on intermediary bank fees.)
Now compare a euro payment from the same Lisbon bank to a German account. Both sit on SEPA. No bridge bank is needed, and the whole thing resembles a domestic transfer. That’s why intra-eurozone payments tend to be cheap and uneventful, and why a dollar payment to Kenya is neither.
Where transfer companies fit in
Online transfer services mostly avoid the long chain by using local rails at both ends. You fund the transfer locally, and the company pays your recipient locally from an account it holds in their country. The cross-border part is handled by the company in bulk, not payment by payment. It’s a different shape of pipe and it explains why many transfers via apps involve no intermediary deduction at all. They aren’t free, though: the cost sits in their fee and rate instead. For the full comparison, see the guide on bank wires versus online services.
What SWIFT gpi adds
The old problem with the letter-and-vault model was that you could lose sight of the letter. SWIFT gpi attacks that. It attaches a unique end-to-end transaction reference (UETR) to the payment so every bank in the chain can update a shared tracker. According to Swift, the tracker shows payment status and rejection reasons, can support recalls, and, through its pay-and-trace service, shows fees charged at each stage of the route. Since 22 November 2020, Swift says, institutions covered by the relevant rules must confirm when a payment has been credited, put on hold, or passed outside Swift.
Swift also claims that nearly 60% of gpi payments are credited to end beneficiaries within 30 minutes and almost 100% within 24 hours. That’s Swift’s own figure, with no sample or period stated alongside it. Treat it as a description of how the network can perform, not a promise for your payment. Banks differ on handing you the UETR, and not every bank on a route necessarily takes part. Ask for the reference. If you have one, your bank or the recipient’s can often look the payment up.
What to take from all this
Five things are worth keeping in your head.
Same-currency payments inside one rail area are usually quick and cheap. Cross-currency payments, or payments to a country with few direct links, take more hops. More hops mean more chances for a deduction or a hold. A message that has been sent doesn’t mean money has arrived. And each bank in the chain can ask a question, which is why a payment sometimes pauses with no explanation you can see.
If you’re comparing options for a particular route, such as GBP to EUR where rails can do most of the work, versus something like USD to KES where the chain is more likely to be longer, the same logic applies: count the hops. Rates refreshed hourly on both pages if you want to see where the mid-market sits before you compare quotes.
None of this is advice about a specific payment. Practices differ by bank and by route, and rails change their rules and limits, so check with your provider before you send.
Sources
- Discover Swift (Swift)
- Swift gpi (Swift)
- Correspondent banking, final report (CPMI, Bank for International Settlements)
- SEPA Credit Transfer (European Payments Council)
- Europe’s Instant Payments Regulation and the 9 October deadline, explained (Finextra)
- 1 million Faster Payments now possible (Pay.UK)
- The ACH Network (Nacha)
Checked: November 2026
