Polymarket vs Smarkets (2026)
Short answer: Polymarket scores clearly higher overall (67 vs 31). Smarkets is the better pick for developers building trading tools on the Smarkets betting exchange with the streaming API and Python client.
From public data checked . How we know
Choose Polymarket if you…
Betting exchange
Best for: Developers wanting free public market and event data, including sports, from a prediction market exchange without credentials.
- ✓ want to start on a free tier
- ✓ value a large open-source ecosystem of wrappers and examples
- ✓ care most about what developers report in practice
Not ideal for: Sports-only data needs or bookmaker odds; it is a prediction exchange and sports endpoints and rate limits were not verified.
What developers say
Widely used as a free, no-key source of prediction-market prices (Gamma and CLOB APIs) for sports arbitrage bots, wallet trackers and odds aggregators, with many GitHub clients and MCP servers. Users note thin or missing historical data and the need to match events across Kalshi and sportsbooks; live-score speed is a concern.
Choose Smarkets if you…
Betting exchange
Best for: Developers building trading tools on the Smarkets betting exchange with the streaming API and Python client.
What developers say
UK betting exchange with a free streaming/REST API, mentioned as a Betfair alternative for arbitrage and trading bots, and cited as a lay-price source in odds aggregators. Evidence is mostly old: a 2010 launch, and a metaforecast issue about missing contracts in market data. Little current opinion.
Side by side
| Polymarket | Smarkets | |
|---|---|---|
| SportDex Score | 67/100 (#6) | 31/100 (#138) |
| Popularity | 61 | 29 |
| Community & reliability | 88 | Not enough data |
| Transparency | 65 | 15 |
| Developer experience | 54 | 49 |
| Type | Betting exchange | Betting exchange |
| Starting price | Free tier | Price not public |
| Free tier | Yes | Not disclosed |
| Free trial | Not stated | Not stated |
| Sports | Multi-sport (40+) | Multi-sport (40+), Football (soccer), Horse racing |
| Data | Trading & risk, Fixtures, Odds | Trading & risk, Odds |
| Delivery | Polling only (REST) | Streaming (Push feed) |
| Protocols | REST | Push feed |
| Live / in-play | Not disclosed | Not disclosed |
| Commercial use | Commercial: not disclosed | Commercial: not disclosed |
| Betting products | Betting: not disclosed | Betting: not disclosed |
| Documentation | Docs | Docs |
| Developer discussions | 52 | 4 |
| GitHub repos | 4.5k | 38 |
| Community tone | Mostly positive | Too little discussion |
Empty fields mean the provider does not say, not that the feature is missing.
Quick answers
- Is Polymarket or Smarkets better?
- Polymarket scores clearly higher overall (67 vs 31). Smarkets is the better pick for developers building trading tools on the Smarkets betting exchange with the streaming API and Python client.
- Which is cheaper, Polymarket or Smarkets?
- Polymarket: Free tier. Smarkets: Price not public. Entry plans differ in limits and coverage, so compare what each plan includes.
- Do Polymarket and Smarkets have a free tier?
- Polymarket: yes. Smarkets: not disclosed.