US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The June framework between Washington and Tehran created a real negotiating track, but it is still only an interim roadmap rather than the kind of signed final instrument this market needs to pay out Yes. Mediators Qatar and Pakistan said the sides agreed on a 60-day path towards a final deal, while Reuters later reported that talks were still focused on unresolved issues such as the Strait of Hormuz, sanctions relief and Iran’s nuclear programme, which points to a wide gap between a working process and a binding end-state[1][4].

That is why a 0% crowd-implied probability is not obviously irrational on a platform-comparison basis: these markets usually price the absence of a formal document, not just positive diplomacy. On Polymarket the quote is shown as implied probability, while Kalshi and Smarkets often present a contract-style decimal price, so the same view can look different across books even before fees; Betfair’s exchange model also matters because liquidity and commission can shift the effective price. The historical pattern here is that early “guiding principles” or MoUs often lead to more talks, not an immediate final accord, as seen in February and June reporting that progress was real but details were still outstanding[3][8][11].

For traders, the main catalysts are any announced deadline for the technical working groups, confirmation of IAEA access or monitoring terms, and any public statement on sanctions relief or frozen assets, because those are the sticking points most directly tied to a signable written deal[7][10][20]. Reuters reported in early July that the sides were still negotiating maritime traffic and unfreezing Iranian funds, which suggests the market can move sharply on procedural headlines even before a final text appears[4]. KYC reach also matters: access to Polymarket, Kalshi, Betfair or Smarkets varies by jurisdiction, so the same news may be tradable in one venue and blocked in another.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares US-Iran Final Nuclear Deal by…? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.