Story perspectives

Coinbase CEO Warns of Manipulation in Betting Markets

11/2/2025

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Summary

Story summary

Brian Armstrong, Coinbase CEO, raised concerns about manipulation of prediction markets during the earnings call.
He listed Bitcoin and Ethereum as terms in Kalshi and Polymarket betting markets, where users wagered on which terms would be mentioned.
Critics say Armstrong's actions undermine the credibility of prediction markets meant to aggregate information.
Coinbase has invested in Kalshi and Polymarket as Commodity Futures Trading Commission (CFTC) considers guidelines for mention markets.

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Story summary

Brian Armstrong, Coinbase CEO, raised concerns about manipulation of prediction markets during the earnings call.
He listed Bitcoin and Ethereum as terms in Kalshi and Polymarket betting markets, where users wagered on which terms would be mentioned.
Critics say Armstrong's actions undermine the credibility of prediction markets meant to aggregate information.
Coinbase has invested in Kalshi and Polymarket as Commodity Futures Trading Commission (CFTC) considers guidelines for mention markets.