Polymarket Odds Sweep

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When the crowd suddenly changes its mind on a prediction market.

What it is

Odds shift several percentage points fast, with rising volume — that's a sweep. Means a lot of money piled in one direction at once.

Why it matters

A sweep is a repricing: the probability the market assigns to an outcome moved several points while volume rose, which means the move was paid for rather than drifted into. The volume behind it is what separates a genuine repricing from a thin book being nudged by one order.

How to read the alert

The alert reports the odds before and after, the size of the shift in percentage points, and the volume that came with it. A ten-point move on $1M of volume and the same move on $20K are different events, and those two numbers are what tell them apart. The market link shows whether the new odds held after the sweep finished.

Sample alert

📈 Sweep on 'Yes' · 4 trades · $18,400 total
latest BUY @ 0.71 · $5,680 by lively-amber-tapir · 1m ago
Will Ethereum ETF inflows exceed $1B this month?

ℹ️ Information only, not financial advice.

Open market Transaction

Each alert includes

Market question
For a sweep: how many trades hit the same outcome inside the two-minute window, and their combined size
For an odds swing: the implied probability before and after the move
The latest trade — side, price and size — and a direct link to the market