CoinDesk
A days-old Polymarket wallet called "fishalive" turned roughly $4 million into about $9 million in profit on Monday after FIFA World Cup debutant Cabo Verde held European champions Spain to a 0-0 draw, according to Polymarket trading data reviewed by CoinDesk and on-chain analytics firm Lookonchain. The account wagered that Spain would not win outright and that Cabo Verde would stay within 2.5 goals — both legs paid out when the match ended scoreless. Spain had started the match as an overwhelming 1:10 favourite.
The Spain-Cabo Verde match alone drew about $64 million in trading volume on Polymarket, the crypto-based prediction market that settles positions in USDC on a public blockchain. The platform's overall World Cup winner market has now moved roughly $2.4 billion in bets, surpassing the roughly $1.4 billion wagered on this year's Super Bowl and making the tournament Polymarket's largest event since last year's U.S. election.
Why it matters
The size and timing of the fishalive position is the part drawing scrutiny. The wallet was created this month, had no prior trading history, and placed two large opposing-to-the-favourite bets on a match priced at roughly 92% for a Spain win. On-chain transparency means every position was visible in real time — the same feature that lets anyone bet pseudonymously also leaves a public trail outsiders can analyse. Polymarket does not collect the background information regulated sportsbooks do, a gap lawmakers have repeatedly criticised.
Market impact
The losing side underscores the risk profile. Another trader, "betoor619," put nearly $1.1 million on a Spain win when the market priced that outcome near 92% — a bet that would have paid out only about $85,000 had it landed, and lost almost the full stake when it didn't. The account had never won or lost more than $9,000 on a single event before, according to its public history. With roughly $2.4 billion now riding on the tournament winner market, the World Cup is stress-testing both Polymarket's liquidity and the limits of anonymous, on-chain sports betting at scale.
Frequently asked questions
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Who is the "fishalive" Polymarket trader?
The wallet goes by the pseudonym "fishalive" and was created this month, according to on-chain analytics firm Lookonchain. Its real-world identity is not known, and Polymarket does not collect the background information regulated sportsbooks do.
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How much did the fishalive trader make on the Spain-Cabo Verde match?
The wallet redeemed about $4.7 million on the Spain market and $8.5 million on the spread bet, for a one-day profit of roughly $9 million, per its public trading record reviewed by CoinDesk.
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How big is Polymarket's World Cup trading volume?
The Spain-Cabo Verde match alone drew about $64 million. Polymarket's overall World Cup winner market has moved roughly $2.4 billion, surpassing the roughly $1.4 billion wagered on this year's Super Bowl.
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Why are people questioning whether the trade was insider information?
The fishalive account was days old, had no prior history, and loaded two large bets against a 92% favourite in a match Spain was widely expected to win. On-chain transparency means every position was visible in real time, and observers are now debating whether the trade reflected signal, luck, or non-public…
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How does Polymarket handle regulation and KYC?
Polymarket settles positions in USDC on a public blockchain and traders operate under pseudonyms tied to crypto wallets. The platform does not collect the background information that regulated sportsbooks do, a gap lawmakers have repeatedly criticised.
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