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PolyQuantLab covers Polymarket’s crypto Up/Down binary markets — the markets whose event_type is one of 5m · 15m · 1h · 4h · daily_up_down.

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Event types

event_typeDurationResolution boundary
5m5 minutesevery :00, :05, :10 …
15m15 minutesevery :00, :15, :30, :45
1h1 hourevery :00
4h4 hoursevery 4-hour boundary
daily_up_down1 daymidnight UTC
Each market resolves Up if the underlying’s price at the resolution boundary is above the strike price; Down otherwise. Strike is the underlying price at the market open boundary (see Strike price).

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YES / NO tokens

Each market trades two tokens on the Polymarket CLOB:
  • YES — pays out 1ifthemarketresolves∗∗Up∗∗,1 if the market resolves **Up**, 0 otherwise.
  • NO — pays out 1ifthemarketresolves∗∗Down∗∗,1 if the market resolves **Down**, 0 otherwise.
yes_ask + no_ask should be ≥ 1atanypointintime.Whenitdropsbelow1 at any point in time. When it drops below 1 — even by a few cents — there’s a logical arb on the table: buy both sides, collect the deterministic payoff at resolution.

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Strike price

The strike is the underlying’s spot price at the market’s open boundary, not its close. Markets are published 12–24 hours before they open (so users can pre-trade), which means the strike isn’t defined until the open boundary passes. The API computes strike as follows: 
strike = (first Binance spot tick at or after resolution_at - duration)
This is the canonical strike for backtest correctness — using the publish-time price would be off by hours of drift.

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Tickers

Three crypto underlyings:
tickerBinance symbolChainlink aggregator (Polygon)
BTCBTCUSDT0xc907E116054Ad103354f2D350FD2514433D57F6f
ETHETHUSDT0xF9680D99D6C9589e2a93a78A04A279e509205945
SOLSOLUSDT0x10C8264C0935b3B9870013e057f330Ff3e9C56dC
Endpoints accept the ticker form (BTC), not the symbol.

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Resolution outcome

When a market resolves, Polymarket publishes a resolution_outcome string. We normalise to "Up" / "Down":
Polymarket textNormalisedYES payoutNO payout
starts with upUp$1$0
starts with downDown$0$1
anything elseleft raw——
A non- resolution means the market was disputed or N/A — see Resolution risk modeling.