FX is a black box. Same dollar, priced by who's in the middle.
Foreign exchange is the largest market on earth — roughly 35× the NYSE's annual volume, and well over 200× global crypto. It runs on closed bank rails built before the internet: the same intermediaries, the same up-to-five-days to move money across a border, since the 1970s.
Same dollar, two paths.
Every hop in correspondent banking is a counterparty with a margin. On-chain settlement removes the hops rather than hiding them.
Even the modern fintechs — Wise, Revolut, Stripe — ride the same SWIFT and correspondent rails underneath. They hide the friction; they don't remove it. And banks that custody stablecoin balances generally can't lend against them, which turns them into vaults rather than banks, while the balances themselves may carry yield a deposit account does not.
Banking is not replaced all at once. It is dismantled in order.
Nine phases. Cross-border payments fall first because they are the most expensive and the least defended. Fundraising falls last, because relationships compound in a way technology does not.
- 01
Cross-border payments
Sera is hereAlready live. The vanguard of the migration.
- 02
Payment gateways
Stripe, Adyen, the rails behind every online checkout.
- 03
Lending
Small-scale first, scaling up as real-world assets move on-chain.
- 04
Savings & structured products
Yield-bearing stablecoins, on-chain structured notes.
- 05
FX derivatives
Programmable, composable, 24/7.
- 06
eWallets
Mass adoption layer. Bank-account convenience, fully on-chain.
- 07
Merchant POS
Stablecoin acceptance at the till.
- 08
Processors
Visa, Mastercard. Sheltered by distribution; rails rebuilt underneath.
- 09
Fundraising
Last, slowest, hardest. Relationship moats compound.
Phase nine is where the relationship-driven incumbents live longest. Their moat is relationships, not technology — but the rails underneath them get rebuilt anyway, and the next generation evaluates on data rather than relationships.
The WhatsApp moment for banking.
In 2012, telcos owned messaging. Six years later their messaging revenue had collapsed and the carriers were dumb pipes for somebody else's product. WhatsApp shipped free IP-based messaging on a substrate — smartphones plus 3G — that the telcos had built but could not monopolise.
Banks are exactly there now. They own FX through correspondent networks and nostro/vostro accounts, charging 2–5% spreads on roughly $9.6 trillion of daily flow. They own it because nobody else could touch the substrate — and stablecoins changed the substrate. Public chains plus multi-currency stablecoins are the smartphone and 3G of money: a permissionless way to do what banks have charged for, on infrastructure they helped legitimise but cannot control.
The thesis, in short answers.
Why do cross-border payments move onchain before other banking products?
They are the most expensive and the least defended. Correspondent banking takes roughly 15% of a $1,000 transfer across five hops, and no incumbent owns the substrate the way they own a lending relationship. Products where the moat is a relationship rather than technology — fundraising above all — migrate last.
What is the WhatsApp moment for banking?
In 2012 telcos owned messaging; six years later their messaging revenue had collapsed because WhatsApp shipped free IP-based messaging on a substrate the telcos had built but could not monopolise. Banks own FX today on 2-5% spreads over roughly $9.6 trillion of daily flow, and stablecoins on public chains are the equivalent change of substrate.
Will dollar stablecoins stay the majority of the market?
Unlikely over time. A stablecoin is a bank deposit turned into a token, and about 80% of the world's deposits are not dollars, while roughly 98% of tokenised supply is. The dollar wins the crisis, but most salaries are paid and most transactions settle inside one country in that country's own currency.
Why can't an AMM serve stablecoin FX?
Off-curve pricing was never designed for it. FX crosses move continuously and break bonding curves: stable pools misprice the drift, volatile pools quote wide, and liquidity providers take impermanent loss either way. A central limit order book prices both directions symmetrically, which is why Sera is CLOB-native rather than an AMM fork.
What does FX actually cost today?
It depends entirely on who stands in the middle. Airport and retail money changers take 5-15%, neobanks and crypto cards 1-5%, fintechs such as Wise or Revolut 0.5-2%, prime brokerage 0.05-1.5%, and tier-2 interbank desks 0.01-0.05%. Sera settles at interbank on-chain, at roughly 10-30 basis points.
The settlement layer belongs to no one and serves everyone.
Every issuer, every stablecoin, every currency. Forked AMMs can copy contracts, but an off-curve pricing model was never designed for stablecoin FX — pegs drift, and liquidity providers bleed. Only a CLOB-native, multi-currency, non-custodial protocol can hold this seat.