Plain-English definition
A DEX lets people trade directly from their own wallets against a shared pool of liquidity, settled by a smart contract. There is no broker holding your funds.
Most DEXes are built on an automated market maker, a formula that prices trades against a pool rather than matching buyers to sellers. The depth of that pool is, once again, the thing that matters.
Why it matters
DEX (Decentralised Exchange) matters because crypto markets can look precise while still being shallow, crowded, or poorly sourced. A useful read is not just the number. It is the number, the size behind it, the context around it, and the part it cannot explain.
Simple example
A simple DEX (Decentralised Exchange) example is a reader comparing two venues with the same headline price but different depth. The deeper venue can absorb more capital before the trade, peg, or yield reading starts to move against the user.
How Bathymark uses this term
Bathymark uses DEX (Decentralised Exchange) to translate open market data into live liquidity readings. When the term touches a live page, the reading links back to the relevant chain, protocol, stablecoin, DEX, perps, or Signal so the source remains checkable.
Common mistake
The common mistake is treating DEX (Decentralised Exchange) as a complete signal by itself. Bathymark treats it as one instrument: useful when read beside liquidity, source, size, and what the number cannot prove.