Structural#072

Complement-Book Cross-Quoting

Because a YES share and a NO share always add to $1, buying YES is equivalent to selling NO (and vice versa). This strategy quotes both the YES and NO order books together, routing each maker order to whichever book offers a better spread or queue spot while keeping your net position flat. The edge is doubling the places you can provide liquidity and capturing differences between the two complementary books.

What you need to run it

Simultaneous YES and NO order-book feeds
Complement-aware unified quoting engine
Mint/merge handling for share conversion
Joint inventory accounting across both tokens

Where this applies

Markets on Polymarket where complement-book cross-quoting is the natural play:

Will Bitcoin close above $115k on Aug 31, 2026?
Will the Democrats win a 2026 House majority?
Will Ethereum close above $6k on Dec 31, 2026?

Capabilities this demands

Custom code / APIModel / quantMulti-venueRisk management

At a glance

CategoryStructural

Requirements4

CapabilitiesCustom code / API, Model / quant, Multi-venue, Risk management

VenuePolymarket (CLOB, Polygon)

Build it

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This is documentation, not advice. Poly Research & Robotics publishes how these strategies work because the method should be checkable — not as a recommendation to trade them. See the full strategy database (297 strategies) or the data feeds directory.