Plain-English definition
An EOA is an ordinary account: a human (or a bot) holding a private key. It is distinct from a smart-contract account, which is governed by deployed code.
Grouping EOAs that seem to share an owner is the core of on-chain clustering. Open heuristics get you only part of the way, which is precisely why labelling is hard and valuable.
Why it matters
EOA (Externally Owned Account) 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 EOA (Externally Owned Account) 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 EOA (Externally Owned Account) 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 EOA (Externally Owned Account) 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.