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# Coin Pair

In Crescent DEX, anyone can create a pair of two coins, which is an ordered pair. The ordered coin pair is unique in Crescent DEX, which means only a single pair of a given ordered coin pair is allowed. For example, Crescent DEX can have only one pair for `A-B` coin pair consisting of `Coin A` and `Coin B`. Crescent DEX can also have `B-A` coin pair, which is different from `A-B` coin pair.
The base coin is the first coin that appears in a coin pair quotation. Consequently, the second coin appeared in the pair is a quote coin.
Base coin and quote coin of an ordered coin pair
Example
In the pool of `bCRE-CRE`, the base coin is `bCRE` while the quote coin is `CRE`. The pool price `1.133` means, the base coin `1 bCRE` is traded against the quote coin `CRE` and exchanged for `1.133 CRE`.