OPEN Daily Up or Down historical data
OPEN Daily Up or Down is a Polymarket equities series with markets recurring daily. Marketlens has captured 112 markets since March 2, 2026, of which 111 resolved, with $64.6K in traded volume. Every market's order book is stored in full: periodic L2 snapshots plus every individual price change with a millisecond timestamp, alongside trades, candles, and the final resolution outcome.
Data as of 2026-08-16 · series slug open-daily-up-or-down
Resolution outcomes
Outcomes across 111 resolved markets with a recorded winning outcome. Settlement in the archive is by winning outcome, not by final traded price.
Markets in this series
The most recently resolved of 112 markets.
Opendoor (OPEN) Up or Down on August 14?
closed 2026-08-14 · resolved Down
Opendoor (OPEN) Up or Down on August 13?
closed 2026-08-13 · volume $2.5K · resolved Up
Opendoor (OPEN) Up or Down on August 12?
closed 2026-08-12 · volume $640 · resolved Down
Backtest this series
from marketlens import MarketLens
client = MarketLens()
result = client.backtest(
MyStrategy(), "open-daily-up-or-down",
after="2026-08-07", before="2026-08-15", initial_cash=1_000,
)
result.show() # inspect the run in the dashboardAvailable datasets
Common questions
How many OPEN Daily Up or Down markets are in the archive?
112 markets from March 2, 2026 through August 14, 2026, of which 111 have resolved and 1 are active.
What data exists for each OPEN Daily Up or Down market?
Full L2 order book history (snapshots plus every price change at millisecond resolution), individual trades, OHLC candles, and the resolution outcome. All of it is queryable by the series slug "open-daily-up-or-down" through the API and Python SDK, or downloadable as Parquet.
How often do OPEN Daily Up or Down markets resolve Down?
Of 111 resolved markets with a recorded outcome, 56 resolved Down (50.5%) and 55 resolved Up.
How much does a typical OPEN Daily Up or Down market trade?
Average traded volume is $1.0K per market, $64.6K across the series.
Can I backtest strategies on OPEN Daily Up or Down?
Yes. Pass the slug "open-daily-up-or-down" to client.backtest() in the Python SDK. Execution mode replays every market's order book tick by tick and fills simulated orders against real historical depth with queue priority, latency, and fee modelling; Alpha mode replays one bar per market for slower signals over long windows.
Related series: S&P 500 monthly hit, SPY Daily Up or Down, SPY Hit Price Weekly, Meta Hit Price Monthly, Palantir Hit Price Monthly, OPEN Neg Risk Weekly, or all equities series.
Try it
Replay OPEN Daily Up or Down tick by tick
The free tier includes 5M rows per day with full API and full archive access, no card required.
$ pip install marketlens