Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Kalshi UK) Pick polygram.ink (preferred broker) |
52% | 48% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
52% | 48% | 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 → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| ↑ 65,000 | 52% |
| ↓ 64,000 | 45% |
| ↑ 66,000 | 7% |
| ↓ 63,000 | 5% |
| ↑ 68,000 | 1% |
| ↑ 67,000 | 1% |
| ↓ 62,000 | 1% |
| ↑ 72,000 | 0% |
| ↑ 71,000 | 0% |
| ↑ 70,000 | 0% |
| ↑ 69,000 | 0% |
| ↓ 61,000 | 0% |
| ↓ 60,000 | 0% |
| ↓ 59,000 | 0% |
| ↓ 58,000 | 0% |
| ↓ 57,000 | 0% |
Market context
Bitcoin is being priced on Polymarket as a **conditional token stack** settled in **USDC on Polygon**, so the market is really trading whether BTC prints through specific strike levels before the settlement window closes, not expressing a simple directional view on Bitcoin itself. With the current crowd-implied probability at **0% YES**, the book is implying that none of the listed price thresholds are expected to be hit in time, which is an unusually strong statement for a contract this close to expiry.
For context, short-dated Bitcoin price markets often reprice sharply around round-number levels and then compress as expiry approaches, because traders are forced to choose between a clean break and a failed attempt. Comparable August forecasts from retail and model-based outlets still cluster around the mid-$60,000s for early August, with several sources flagging support near $59,500–$62,000 and resistance around $67,500–$70,000, which helps explain why strikes in that band tend to attract the most activity.[2][10][13][17] The main point for a Polymarket user is that the contract can gap from near-dead to active very quickly if spot trades through a threshold on a liquid venue before settlement.
Catalysts to watch are the usual mix of spot volatility, ETF flow headlines, and any macro-driven move in risk assets, because those are the inputs most likely to push BTC through a strike in a single session. Recent coverage has also highlighted August policy and calendar risk, including the possibility that crypto legislation and other scheduled political events could affect sentiment, while technical commentary has pointed to a narrow support zone near $60,000 and a larger resistance band into the high $60,000s.[10][11][16] In practice, traders should watch the timestamped settlement rules, BTC/USD reference behaviour around the expiry cut-off, and whether a late move on Polygon-settled Polymarket liquidity is enough to keep the conditional token live.
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.
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
- 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.
- What's the difference between YES and NO shares?
- A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.
- 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%.
Trade What price will Bitcoin hit on August 6? on Kalshi UK
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