Stablecoins, exchanges without order books, liquidity pools and on-chain lending — how each mechanism works, and where it can break.
A stablecoin is a crypto token that tries to stay worth a fixed amount, usually one US dollar. Here is how that promise is built, who stands behind it, and why “stable” is a goal rather than a guarantee.
No stablecoin is held at $1 by a law of nature. Each one relies on a mechanism that gives traders a reason to push the price back — and each mechanism has a point where that reason disappears.
A decentralized exchange lets you swap tokens straight from your own wallet. Instead of matching buyers with sellers, most use a pool of tokens and a formula. Here is what that formula does to the price you get.
Putting two tokens into a pool earns a share of trading fees — but the pool quietly sells whichever token is rising. Here is exactly how much that can cost, using the standard constant-product formula that Uniswap’s documentation also quotes.
DeFi lending replaces the loan officer with a smart contract and the credit check with collateral. That makes borrowing open to anyone — and makes liquidation automatic when prices move against you.
TVL is the headline number of DeFi: the dollar value of everything deposited in a protocol. It is useful for sizing things up — and easy to misread. Here is how it is built and where it misleads.
SSR divides Bitcoin’s market value by the market value of all tracked stablecoins. A low number means stablecoins are large relative to Bitcoin — which Glassnode reads as more stablecoin “buying power” to purchase BTC.
A DEX is an exchange made of smart contracts. You trade straight from your wallet, usually against a pool of tokens rather than another person’s order.
Liquidity describes how easily you can buy or sell something at a fair price. In DeFi, the word also means the tokens people deposit into pools so others can trade.
Slippage is the gap between the price you were shown and the price you actually got. It is usually small in busy markets and can be large in thin ones.
A stablecoin is a crypto token that tries to stay worth a fixed amount, almost always one US dollar, while moving on a blockchain like any other token.
A wrapped token is a stand-in: it represents another asset in a format a particular blockchain or app can use, while the original is held somewhere else.
Blocks, transactions, keys and fees: the moving parts every other topic builds on.
Supply schedule, mining, difficulty, Lightning and spot ETFs.
Accounts, gas, staking, the fee burn and layer-2 rollups.
How analysts turn public ledger data into cost-basis, holder and flow signals — and where that breaks.
Spot versus derivatives, funding rates, open interest, liquidations and order books.
Risk, volatility, diversification, position sizing and market cycles for crypto beginners.
Custody choices, seed phrases, hardware wallets and the scams that target new users.
Decentralized finance, or DeFi, replaces some of the jobs that banks and brokers do with smart contracts that anyone can use from their own wallet. Stablecoins are the tokens much of that activity is priced in. Both are easier to understand as mechanisms than as products: a formula that sets a swap price, a pool that rebalances itself, a loan that is liquidated automatically, a peg that holds only while traders have a reason to defend it. This section explains each mechanism with worked arithmetic computed in code, and spends as much time on failure points as on how things are meant to work.
Stablecoins come first because most DeFi activity is priced in them. Read the guides in this order:
The stablecoin, DEX, slippage and wrapped token glossary entries define the terms you will meet most. The stablecoin supply ratio profile shows how analysts compare Bitcoin’s size with the stablecoin supply. Because DeFi runs on smart contracts, the Ethereum section and the guide to token approvals and wallet drainers are worth reading alongside this one.
No. A stablecoin is a token that tries to stay worth a fixed amount, and whether it does depends on its issuer, its reserves or its mechanism. “Stable” is a goal, not a promise. The peg guide shows where each design can fail.
It is the gap between what you hold after providing liquidity to a pool and what you would have held by simply keeping the two tokens. It arises because the pool sells whichever token is rising. The liquidity pools guide works through the arithmetic.