Stablecoins & the Crypto Monetary System
A stablecoin doesn't change the technology. It changes the target.
Technically it is a crypto asset like any other. The difference is what it aims at: while bitcoin's price is free to move, a stablecoin is built to stay near a fixed reference value — usually one US dollar. That one design choice is what lets the market be calculated in advance.
The problem
One payment, seven days out. Now price it twice.
You have committed to hand over 500 dollars of value at the end of the week, and you want to set the amount aside today. Two assets can carry it. Both start at the same index. Run the week, then price the same plan against each one.
Seven days, two traces, one frame
ILLUSTRATIVE MODELDay 0. Both assets sit at index 100, and the plan costs the same against either one. The numbers here are a model of the mechanism, not any real asset. Press Run the week.
Nothing failed. One trace travelled the whole frame, the other stayed on the line — that is simply what the two are designed to do. The interesting part is not the picture. It is what each of them does to a plan, so now put the same commitment against both.
Seven re-prices against nothing. The rule was the same on both sides: recalculate whenever the amount you must set aside moves by more than 1%. Against the volatile asset every swing moved it, so the calculation had to be redone every single day. Against the stable asset the plan simply held. That is what a stablecoin is for: not a return, not growth — a calculable unit. Trades, DeFi positions and payments can be worked out in advance because the thing you are counting in stays put. Stability is the product.
The definition
Three things sitting behind the word "stable".
Tap each card. One of them is the uncomfortable one, and it is true.
Hands on
What is it built for — and what is it deliberately not?
Five jobs. Three of them are the reason stablecoins exist; two of them are things stablecoins were never meant to do. Pick each one and see which bin it lands in.
Calculability, a digital parking position and instant availability — those are the three jobs stablecoins solve. Price appreciation deliberately is not among them: the aim is stability, not growth. That is exactly why they sit at the centre of trading, liquidity and DeFi.
The bridge
Beyond "what does it track", three questions decide it.
This is where the models separate — and where the rest of this section goes.
"Stable" is the aim a design is measured against, not a law of nature — it holds for as long as the mechanism behind it holds. The rest of this section takes those mechanisms apart one at a time, starting with the most common type of all: fiat-backed stablecoins, and what "backed" actually means.
Check yourself
Five questions.
Answers come straight from this lesson. Submitting completes it.