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A stablecoin is not a dollar. It is a claim on a dollar, and claims have prices.
Usually the price sits at one dollar, near enough that you stop checking. Then someone builds a market for converting one dollar token into another, and that market says the quiet part out loud. If you need an exchange rate between two "dollars," they were never the same dollar.
That is the question hiding inside "are all stablecoins the same." They are all worth about a dollar. They are not worth the same dollar, and the gap between them is not a glitch.
It is a price.
This is a Kodex walkthrough with Ava. She is the architect of the catalogue, the one who reads pressure and geometry instead of branding, who treats a market as plumbing with rules people have not yet learned to read. We will follow her through one live piece of that plumbing and what it admits about every dollar token you hold.
Ava does not start with the four kinds of stablecoin. She starts with the spread, because the spread is where the risk is actually priced.
This week the admission got funded. Spark and Uniswap seeded a stablecoin "FX Layer" with about 150 million dollars, live on Uniswap v4, built to move between dollar tokens the way a currency desk moves between euros and yen. The first pools pair USDS, Sky's stablecoin and the largest crypto-native one, against USDT and against PYUSD. CoinDesk framed it as infrastructure for an industry banks and fintechs are entering, and cited a projection that the flow could grow from 300 billion to 4 trillion dollars by 2030.
Sit with what an FX market is for. Foreign exchange exists because a euro is not a yen. You need a rate, and a venue to trade it, precisely because the two units are different and their relative value moves. Build the same machinery for "dollars" and you have conceded the same thing. The Block called it the plumbing a multi-issuer world needs. Plumbing is the right word. The question is what runs through it.
What runs through it is the difference between one issuer's dollar and another's.
A stablecoin holds its peg through a mechanism: reserves, redemption, arbitrage. That is one token's relationship to one dollar, and Kodex builds it from the ground up in how a stablecoin holds its peg. An FX layer is about a different relationship. Not token to dollar, but token to token. USDS to USDT. USDT to PYUSD. The peg keeps each one near a dollar.
Nothing keeps them pinned to each other.
Ava reads the launch as a confession, not a product.
You do not build an exchange rate for things that are identical. The market exists because the spread exists, and the spread exists because the dollars are not the same.
Same denomination. Different claim.
That is the engine.
Hold USDT and you hold Tether's promise, backed by Tether's reserves, redeemable on Tether's terms, freezable by Tether's contract. Hold PYUSD and the promise is Paxos's, on Paxos's reserves and terms. The word on the token is "dollar" in both cases. What stands behind the word is a different company, a different balance sheet, a different set of rights you can actually exercise.
The market prices that difference continuously. When one issuer's reserves look slightly less liquid, or its redemption slightly slower, or its freeze power slightly broader, its token rests a hair below another's. Not a collapse. A discount of a few basis points that says the market trusts this claim a little less than that one today.
This is not the de-peg story. A de-peg is a token breaking from its dollar, the rare and violent event. The spread is the ordinary, always-on version: two intact, fully backed dollar tokens resting at slightly different prices because the claims behind them are not equally good. Reserves existing is not the same as reserves being liquid and unencumbered, which is the gap what a proof of reserve can't prove walks through. The spread is the market's running estimate of that gap.
Ava's rule here is short. The peg tells you what a token aims at. The spread tells you what the market thinks it is worth getting there.
A discount between two dollar tokens is not a price error to arbitrage away and forget. It is information, if you read it as the question it answers: what does the market know about this claim that the label hides?
Four things move that spread, and each one is a risk you already hold.
The first is reserve quality. What actually backs the token, how liquid it is, whether it can be sold at par in a hurry or only at a markdown when everyone wants out at once.
Redemption friction is the second. Whether you, or only an approved institution, can turn the token back into bank dollars, how fast, and at what minimum size. A token redeemable only in million-dollar blocks by whitelisted partners is worth less in your hands than one you can exit directly.
Then there is freeze power. Every major fiat-backed issuer can freeze a wallet or blacklist an address, the issuer control behind whether your USDT can be frozen. A token that can be frozen mid-transfer carries a risk a bearer dollar does not, and that risk shows up in the price.
Liquidity depth closes the list. How much you can move before the price slips. The same five-basis-point spread means one thing on a 200 dollar swap and something else entirely on a 2 million dollar one.
Read together, the spread stops being a rounding error and becomes a gauge. Wide and widening says the market is repricing one of those four under stress.
Tight and steady says calm. Ava watches it the way she watches funding: not as a signal to act on every tick, but for the moment the number starts disagreeing with the story.
There is a second mechanism inside the FX Layer, and it changes what you are while you wait.
Spark has described a later phase, a "DualPool" design, where dollars sitting in the pool and not immediately needed for a swap get routed into governance-approved lending and yield venues. Crypto Economy reported the pitch plainly: idle capital earns instead of resting. It is not live yet. The current launch is standard Uniswap v4 pools and the 150 million dollars. The routing is the announced next step, not deployed behavior, and it runs into venues a governance process approves rather than anywhere.
The shape of it is worth reading now, because it is the shape convenience always takes. The moment your parked dollar is lent out, you are no longer holding a dollar token. You are holding a claim on a venue that is using your dollar.
You became a creditor without signing anything that felt like a loan.
That is a different risk than the spread. The spread prices the issuer behind your token. This prices the smart contract and the counterparty your balance got routed into while you were mid-swap. Yield, when it appears, is rent paid for carrying that risk, the exact mechanism where stablecoin yield comes from lays out.
Ava's point is not that the design is wrong. Routed liquidity can be efficient, and approving the venues through governance is a deliberate guardrail. Her point is that the conversion is silent. Holding and lending are not the same position, and a feature that turns one into the other without a prompt is plumbing worth seeing before you are standing in it.
Ava lays the three tokens from the launch pools side by side, because the FX Layer treats them as interchangeable inputs and a holder should not. USDS, USDT, PYUSD. All near a dollar. All standing on different ground.
| What you check | USDS (Sky) | USDT (Tether) | PYUSD (Paxos) |
|---|---|---|---|
| What backs it | Crypto collateral plus real-world-asset reserves, governed by the Sky protocol | Cash, US Treasuries and other reserves held by Tether | Cash and US Treasuries held by Paxos under New York oversight |
| Who can freeze it | Protocol-governed controls | Issuer can freeze and blacklist addresses | Issuer can freeze and blacklist addresses |
| How you redeem | Through protocol mechanisms and the wider Sky ecosystem | Direct redemption for verified accounts, large minimums | Direct redemption through Paxos for eligible accounts |
| Why its price can differ | Backing mix and protocol risk, priced by the market | Reserve composition and redemption terms, priced by the market | Regulatory standing and reserve quality, priced by the market |
Three dollars. Three different claims.
None of it is a ranking of which dollar is best.
It is the reason the FX Layer has anything to trade at all. Each token parts from the others on what backs it, who can freeze it, and how you redeem, and every gap there is a few basis points somewhere in the spread. Ava does not stop at the word "dollar." She reads how, who, and what if.
Almost always, and that "almost" is the whole job.
In calm markets the spread between solvent dollar tokens is tiny, a few basis points, easy to ignore. The reason to understand it now is that the spread does not stay tiny. It widens exactly when it matters: when one issuer's reserves come into question, when redemption slows, when liquidity thins and everyone reaches for the same exit at once. The number you ignored for months becomes the number that tells you which dollar to be holding before the crowd works it out.
So before you treat any stablecoin as cash, Ava runs four questions. Not to scare you off stablecoins. To hold them with your eyes open. What backs it, and how fast can that backing be sold at par. Who can freeze it, and under what conditions your balance stops being yours to move. How you redeem, directly or only through someone else. And whether it is being lent while you hold it, turning your dollar into a position you did not choose.
Those four questions are the Survival Framework applied to the safest-looking asset in crypto. The stablecoin that survives a stress event is rarely the one with the best yield or the smoothest app. It is the one whose claim you understood before you needed to.
Are all stablecoins the same? They share a target. They do not share a claim. Read the spread, read the backing, and read whether your dollar is quietly working for someone else. The label is the easy part. The claim underneath it is the part worth your attention.
No. They share one goal, holding a value of about a dollar, but each is a different issuer's claim, backed by different reserves with different redemption and freeze terms. That is why USDS, USDT and PYUSD can trade at slightly different prices against each other even when all three are fully backed. The shared label hides three separate promises.
In normal conditions they trade very close to a dollar, usually within a few basis points. The price drifts when the market reprices an issuer's reserve quality, redemption friction or liquidity, and it can move further under stress. A small, persistent spread between two solvent tokens is ordinary. It is not the same as a de-peg, which is a token breaking from its dollar entirely.
Because they are different claims wearing the same denomination. USDT is Tether's promise on Tether's reserves and redemption terms; USDC is Circle's, with its own reserve composition and regulatory standing. The market prices those differences continuously, so the two can sit a hair apart even though both target one dollar. The gap is the market's estimate of which claim is worth slightly more right now.
It is a venue for swapping one dollar-pegged token directly for another, the way foreign exchange swaps one currency for another. The Spark and Uniswap FX Layer, seeded with about 150 million dollars on Uniswap v4, pairs USDS against USDT and PYUSD. The existence of such a market is itself the point: you only need an exchange rate between two things when they are not identical.
It depends on where you hold it. A token sitting in your own wallet is not being lent. Inside certain products and pools, idle balances can be routed into lending or yield venues, which is the announced later-phase design of the FX Layer's DualPool. When that happens you become a creditor of that venue rather than a plain holder, carrying smart-contract and counterparty risk. Check the terms of any product before assuming your balance is just resting.
