US-Iran Final Nuclear Deal by…?

Platform comparison

Market context

The real-world driver is that Washington and Tehran have already announced a written framework and a 60-day track towards a “final deal”, but the market only pays out **Yes** if a qualifying written instrument is mutually signed or formally adopted by the deadline. Reuters reported on 12 June that a senior U.S. official said a memorandum could be signed “in the coming days”, while later reporting suggested a tentative 60-day arrangement was reached rather than a finished accord[11][17]. That gap matters: markets built on diplomatic text often price the difference between an interim understanding, a memorandum, and a fully executed agreement very sharply, which is why a 0% crowd-implied price can persist even after positive headlines if the settlement rules are strict.

History argues for caution. In February, both sides described “guiding principles” and “good progress”, but Reuters noted that progress did not mean a deal was imminent, and further technical proposals were still needed[7][10]. Al Jazeera later reported that mediators said the parties agreed on a roadmap to a final deal within 60 days, with unresolved issues including enrichment levels, sanctions relief and monitoring arrangements[1][6]. For comparison across platforms, Polymarket and Kalshi usually show implied probability directly, while Betfair and Smarkets are better read via decimal prices that convert into implied odds; fee treatment also differs, with exchange commissions and spread costs often making the same event look slightly more or less attractive after costs. Access differs too: Kalshi is U.S.-regulated, Polymarket access is broader but jurisdiction-sensitive, and Betfair/Smarkets typically require full KYC and local availability.

The main catalysts now are formal text, signatures and any confirmatory statement from mediators Qatar and Pakistan. The June framework reportedly set up technical and monitoring working groups, regular reporting and talks on sanctions, oil exports and nuclear inspections, so any announcement on IAEA access, frozen assets or sanctions waivers could move pricing quickly[5][6][12]. Reuters also reported that Trump had not yet approved the deal at the earlier stage, which leaves a presidential sign-off or explicit adoption as the key binary trigger for this market[17].

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 Kalshi Alternative UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

UK Frequently Asked Questions

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.

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.

Polymarket vs Betfair Exchange: which is better for UK prediction trading?

Betfair Exchange offers UKGC regulation, GBP settlement, and potentially tax-free winnings — but focuses on sports and politics only. Polymarket has deeper liquidity, 0% platform fee, global event coverage, and crypto/geopolitical markets Betfair doesn't offer. For UK traders: Betfair for regulated GBP sports markets; Polymarket for broader, global prediction events.

Is Kalshi available in the UK?

Kalshi is a US CFTC-regulated prediction exchange. UK residents can create accounts but must use USD and US payment methods. Kalshi's product range overlaps with Polymarket but with lower liquidity on most contracts. For UK traders, Polymarket typically offers better prices due to higher global volume.