Cross-Side Matching
On Mettle Market, matching isn’t limited to straightforward bid-ask pairs like on most exchanges. If you do not know how matching works between bid-ask pairs, refer to this documentation:
How to Read Our Order BookWe also allow cross-side matching between buyers of opposing outcomes—YES and NO. This enables deeper liquidity and faster fills without requiring sellers to always be present.
What Does This Mean?
Let’s say:
Alice submits a BUY YES order at $0.40.
Bob submits a BUY NO order at $0.60.
These two orders can match with each other, even though both are bids—because they represent opposing beliefs:
Alice is willing to pay $0.40 for YES.
Bob is willing to pay $0.60 for NO.
Together, their prices sum to $1.00, which is the full value of the binary outcome.
Why This Works
Prediction markets are zero-sum: If YES wins, NO loses (and vice versa). So when two users are willing to buy opposite outcomes at prices that add up to $1 or more, Mettle Market can:
Match them
Lock collateral from both sides
Mint both YES and NO tokens on-chain
This creates a self-contained pair trade—no seller needed.
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