Open interest is a balance, not a flow

A market can look quiet in the tape and still carry a meaningful amount of open exposure. That is the first reason to keep open interest separate from volume.

Polymarket's analytics documentation treats recent trades, event live volume, and open interest as different reads. Each one answers a different question about the same market.

Ask what changed

Recent trades show matched activity, including side, price, size, outcome, wallet, and timestamp. Live volume summarizes taker activity across an event. Open interest measures the value currently held in outstanding positions.

If a dashboard shows only one of these numbers, label it precisely. A burst of trades is a flow through the market; open interest is a balance that can remain after the burst ends.

Keep units visible

The documented open-interest value is in USDC. Trade size is expressed in shares, while price is USDC per share. Mixing those units can make a large-looking number appear comparable when it is not.

Store the market condition ID beside the measurement and record the timestamp. A global open-interest response and a market-specific response are not interchangeable rows.

Use a sequence, not a single score

A useful review lines up recent trades, event volume, and open interest over the same observation window. The comparison can show whether activity is adding exposure, moving existing exposure, or simply passing through.

The useful question is not whether one metric is high. It is which metric moved, in what unit, and whether it describes flow or the positions left behind.

Further reading: Public analytics.

Explore the markets: Open Polymarket (referral link).