Riot Games, the publisher behind League of Legends and Valorant, is talking to Polymarket and Kalshi about bringing prediction markets into its esports events. The Riot Games Polymarket Kalshi sponsorship talks were first reported by Bloomberg on September 10, 2026. It is the first time a major game publisher has openly discussed letting a prediction market platform attach its brand to professional tournaments. No deal has been signed. Neither platform has confirmed the discussions publicly, and Riot’s own comment on the matter was limited to a single statement rather than a press release, which is itself a sign of how early these conversations are.
What Riot Actually Said
Riot did not deny the talks. A company spokesperson, Joe Hixson, gave Bloomberg a short statement: prediction markets are “an emerging space that we’re evaluating with a focus on safeguarding competitive integrity, potential value for teams, impact on the fan experience, and alignment with our broader ecosystem goals.”
That wording matters. Riot is not saying yes. It is listing the conditions a sponsor would need to meet, with competitive integrity listed first. For a publisher that has spent years policing match-fixing in its own scenes, that ordering is deliberate. Each of the four conditions also does different work. Competitive integrity is about preventing manipulation of outcomes once real money is riding on them. Value for teams signals that Riot wants any deal to feed revenue back into the organizations that play the games, not just into Riot’s own coffers. Fan experience is about whether prediction markets get folded into broadcasts in a way that adds context rather than clutter. Ecosystem goals is the catch-all that lets Riot walk away from a deal that checks every other box but still feels wrong for the brand.
Why GRID Data Is the Real Sticking Point
Any approved sponsor would reportedly have to pull its match data exclusively from GRID, the data provider Riot already works with. GRID pipes official numbers straight from Riot’s game servers, which is meant to stop markets from settling on delayed, third-party, or manipulated stats. That distinction is not academic. A prediction market that settles a contract off a stat that gets corrected minutes later, or that comes from a scraped and un-verified feed, creates exactly the kind of dispute Riot wants to avoid attaching its name to.
Polymarket already has that relationship. The platform partnered with GRID in June 2026 to build a dedicated esports hub with live data and streaming, and became GRID’s exclusive prediction market partner at the time. That existing pipeline is likely one reason Polymarket is at the table for the Riot conversation at all. Kalshi does not have the same head start and would need its own data arrangement to meet Riot’s bar, which raises a practical question: does GRID’s existing exclusivity with Polymarket leave Kalshi any room to negotiate a separate feed, or does Riot’s condition effectively hand Polymarket a structural advantage before talks even conclude?
Kalshi and Polymarket Already Have Skin in Esports
Neither platform is new to esports betting. Polymarket already lists markets on CS2 majors, and our guide on how Polymarket CS2 betting works breaks down how those contracts get priced and settled. The mechanics for League of Legends or Valorant markets would likely follow a similar structure once official data is in place, though the settlement conditions would need to account for Riot’s own competition rulebooks, which differ from Valve’s in areas like map veto procedures and forfeit rules.
The broader logic behind esports prediction markets is covered in our explainer on how Polymarket esports odds actually work, which is useful background for readers unfamiliar with how these contracts differ from a traditional sportsbook line. Riot’s own rules changed in 2025, when the publisher eased restrictions on gambling-related sponsors, opening the door for conversations like this one to happen at all. Before that shift, Riot had kept betting operators at arm’s length from its own branding, even as unregulated books built entire product lines around League and Valorant matches without any formal relationship to the publisher.
The Money Behind the Push
Riot has a financial reason to care about this beyond brand safety. Betting tied to League of Legends and Valorant reached $10.7 billion in 2024, according to Sportradar data cited in Riot’s own review of the space, and most of that action ran through unregulated books with no relationship to Riot at all. A licensed, data-verified sponsor would let Riot capture some of that value and keep a closer eye on how its games are being priced for betting, rather than watching a multibillion-dollar market operate entirely outside its view.
Timing lines up with that motive. The League of Legends World Championship starts in October 2026, the single biggest viewership and betting event on Riot’s calendar. If a sponsorship deal happens, this is the moment it would need to land, since missing Worlds would mean waiting until the next major international event for a comparable audience.
What a Deal Would Actually Look Like
Riot has not published terms, so any deal structure is still a guess. A useful comparison is Kalshi’s existing arrangement with a major sports property. Our breakdown of Kalshi’s US Open partnership shows how that deal handled exclusivity and integrity language, which is roughly the same territory Riot is negotiating in now, just with a different sport and a different set of match-fixing risks. Traditional tennis match-fixing tends to involve individual players; esports match-fixing has historically involved entire teams or coaching staff, which changes what an integrity clause needs to cover.
One open question is whether Riot would let both Polymarket and Kalshi in, or pick one exclusive partner the way GRID did with Polymarket for data. Another is whether teams themselves would see any revenue from a sponsorship, since Riot’s statement specifically mentioned “potential value for teams” as a criterion. That detail suggests team organizations, not just Riot, are part of the conversation, and it hints that any final structure may need buy-in from the League Championship Series and Valorant Champions Tour franchise partners before it can move forward.
What to Watch Next
Nothing here is finalized, and Riot could walk away from both platforms without ever announcing terms. Watch for three signals over the next few weeks: whether Kalshi strikes its own data deal with GRID, whether either platform lists League of Legends or Valorant markets ahead of Worlds, and whether Riot makes any public statement beyond the single quote given to Bloomberg. Any one of those would be a much clearer signal than the talks themselves that a deal is close. Until then, treat this as an early-stage conversation rather than a done deal, and expect the practical details — exclusivity, team revenue share, and data licensing terms — to surface only once Riot is ready to make an announcement on its own terms.
