Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Prediction Today) Pick polygram.ink (preferred broker) |
99% | 1% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
99% | 1% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
Market context
The immediate shift in the last 24–48 hours has been a pullback from record territory as traders pared risk ahead of the July jobs report, after an earlier rally that pushed the S&P 500 back to fresh highs this week. Reuters noted that the market had been driven by technology strength and calmer oil prices, but that inflation and rate expectations were still the main test for the advance.[1]
That leaves the current **95% YES** pricing looking consistent with a market that has been trending higher, but it also signals that the bar is now low for an up day versus the previous close. Recent sessions show the index moving in relatively tight, news-driven swings: one report put the S&P 500 at 7,709.96 after a 0.18% decline, while another Reuters-linked update cited a 7,482.71 close on a prior volatile session, underscoring how quickly direction has flipped around geopolitical and rates headlines.[2][3] The broader backdrop is still constructive, with CNN describing the index as back at record highs earlier in the week and up strongly from the spring lows.[18]
For traders, the key catalysts are already scheduled and mostly macro rather than company-specific. The July employment report lands before the open, with nonfarm payrolls and unemployment the central inputs for Treasury yields and Fed-rate expectations.[7][11][12] Reuters also flagged next week’s CPI as another inflation check on the durability of the rally, while recent moves in oil and Iran-related headlines remain relevant because they feed directly into inflation and risk sentiment.[1][18]
Methodology
We track S&P 500 (SPX) Up or Down on August 7? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.
Resolution & payout
At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.
On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.
UK Frequently Asked Questions
- Is this market available outside the US?
- Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.
- How does resolution work?
- Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.
- Is Polymarket legal in the UK?
- Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.
- Do I pay tax on prediction market profits in the UK?
- UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.
- How do I deposit on Polymarket from the UK?
- UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.
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