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About Sirens Spell
When asked about the Chargers—one of several teams, alongside the Dallas Cowboys and Denver Broncos, seeking to bounce back from a Week 1 upset to avoid an 0-2 start—Kubiak brushed off the narrative during his brief news conference.
That same single-game focus applies to the Raiders, with reporters pressing Kubiak on potential overconfidence following a 27-13 home win over the Miami Dolphins.
“Hopefully [the players] are mature enough to know that one of 17 is nothing,” Kubiak said.
What is Sirens Spell?
James Monk, founder of sports data and streaming provider Catalist Sports, has witnessed that dependence directly. Catalist supplies ITF tennis data to Kalshi and Polymarket and has an exclusive US sports-streaming agreement with Kalshi.
The company must also provide data to the firms making markets on those events.
“If we just sold the data to Kalshi in order to list the markets but no one was coming in and placing liquidity, there’s no point in them listing the markets,” Monk said. “We also need to supply the data to the market makers to inform their models.”
About Sirens Spell
A similar scenario is playing out on the back of the MLB index introduction. Both LeagueShares and RexShares filed plans for ETFs tied to the FutureSports MLB indexes.
If approved, the funds would hold baskets of the CME-traded derivatives. LeagueShares went a step further by adding a filing for 2x leveraged MLB futures funds.
“Of course there’s already a filing for daily leveraged futures baseball ETFs — which are basically the equivalent of a corked bat with eight holes drilled in the handle that’s been dipped in pine tar,” wrote Ben Johnson, head of client solutions at Morningstar, on X.
