Polymarket volume misreported as data providers double-count trades, report
According to a report from Paradigm, an investor in Polymarket competitor Kalshi, several important data providers were miscounting Polymarket volume, leading to volume values double what the volume actually was.
The report, which came from Paradigm’s research partner, Storm Slivkoff, detailed how many data providers were relying on counting the number of “OrderFilled” events that were emitted from the Polymarket contract.
However, when a trade occurs on Polymarket, there are actually two “OrderFilled” events, one for the marker and one for the taker.