I stepped into a very typical PnL pit yesterday: the cash flow looked like a loss of 3.35 million, but it wasn't daily revenue at all.

Here's what happened.

I took 5 of the highest profit Polymarket addresses, calculated the recent 14-day performance based on activity flow, and the total was -3,350,709.97. At first glance, it's quite scary, like these addresses lost 3.35 million in 14 days.

Did it crash?

After studying for a long time, I realized there was a key issue:

Positions bought without selling just represent cash flow going out, which does not equal a loss for the day.

If a wallet spends 100,000 today to buy a position, the system will only see a flow of -100,000. But that position is still there, it might increase tomorrow, or settle next week. You can't say it lost 100,000 today just because money left the balance.

More obviously, when calculating the same batch of addresses with a monthly activity formula, the result is 1,398,554.24; but PredictFolio only has 100,977.66 during the same period, a difference of 1,297,576.58.

The problem is not in the numbers, but in the metrics.

Activity is more like a cash flow audit: money in and money out.

PnL is more like revenue statistics: how much the asset has increased or decreased during this period.

So my criteria changed to:

Look at the performance over the period, using cumulative PnL snapshots.

Check the capital flow, using activity.

Do not confuse "buying forms a position" with "losing principal for the day."

The place where on-chain data is most deceptive is not because it lacks data.

But because it gives you a number that seems very precise, but the metrics are completely wrong.

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