Platform Ratings
What Polymarket Does Better Than Anyone Else
Liquidity: No prediction market comes close to Polymarket's CLOB depth. During the 2024 US election, individual markets traded over $50M per day. Bid-ask spreads on top markets are typically 0.2-1 cent — tighter than any competing platform.
0% fees: Polymarket charges no trading commission. Market makers earn the spread. This means a £1,000 trade costs you exactly £0 in platform fees. Compare this to Kalshi's up to 7¢/contract or spread betting margins of 3-5%.
Market variety: 5,000+ active markets across US/UK/global politics, crypto prices, sports, macroeconomics, entertainment, and science. New markets launch within hours of major news events.
On-chain settlement: Resolution uses UMA Protocol's optimistic oracle. Every resolution is publicly verifiable on Polygon's blockchain. No operator can quietly change an outcome.
Pros and Cons
Pros
- Largest CLOB globally ($300M+/month)
- 0% trading fees
- 5,000+ active markets
- On-chain auditable settlement
- $74M in credible VC funding
- CLOB mirrors via PolyGram (UK)
Cons
- UK IP geoblocked (use PolyGram)
- USDC only — no GBP direct
- Occasional resolution disputes
- No FCA regulation
- KYC required for all accounts
- Smart contract risk (inherent)
Resolution Accuracy — Our Analysis
We reviewed 200 resolved markets from 2023-2026. Key findings:
- 197 of 200 resolved without dispute within 48 hours of the event outcome
- 3 markets triggered the UMA dispute mechanism — all 3 resolved correctly after the dispute vote
- Average resolution time after event: 6.2 hours
- No confirmed cases of incorrect resolution that was not subsequently corrected
The UMA dispute mechanism works as designed. The 3 disputed resolutions involved ambiguous question wording, not deliberate manipulation — and all three were corrected.
UK Access — How to Use Polymarket From Britain
Direct access: not possible (UK IP geoblocked). Via PolyGram: full access. PolyGram mirrors Polymarket's CLOB, giving UK users identical prices and liquidity. Create a PolyGram account at polygram.ink, deposit USDC via Coinbase UK on Polygon, and trade any Polymarket market.
Verdict
4.1 / 5 — Best prediction market globally. UK access requires PolyGram.
If you are outside the UK (or using PolyGram as a UK user), Polymarket's CLOB is the clear first choice for prediction market trading. The combination of deepest liquidity, lowest fees, widest market selection, and on-chain settlement makes it the benchmark all competitors are measured against.