Plain-English definition
Instead of an order book, an AMM holds two assets in a pool and uses a simple formula to quote a price for any trade. Buy one side and you raise its price along the curve.
It is an elegant machine that never sleeps, but it has a cost for the people who supply the pool: impermanent loss. The deeper the pool, the gentler the curve and the smaller the slippage.
Why it matters
AMM (Automated Market Maker) 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 AMM (Automated Market Maker) 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 AMM (Automated Market Maker) 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 AMM (Automated Market Maker) 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.