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Betting exchange · United Kingdom

Smarkets

UK person-to-person betting exchange offering a streaming trading API for order entry and market data, with an official Python client.

Facts verified against the provider's site on

Commercial use: not disclosedBetting use: not disclosedToo little discussion
Visit official siteOpen API docsCompare
31

SportDex Score

#138 of 233 sports APIs

See the full ranking →
Popularity
29

Brand demand, developer discussions, GitHub repos and videos

Community & reliability
—

Tone of public discussions, liked vs criticised points, reliability complaints; not enough public discussion to judge.

Transparency
15

Public prices, docs, terms and coverage you can check before calling sales

Developer experience
49

Free access, docs, SDKs, OpenAPI, sandbox, realtime delivery, ecosystem

Reliability reports from developers: Missing contracts in market data.

Computed from public data only; uptime and latency are not measured yet. Enterprise feeds that sell by contract score lower on transparency by design. How the score works

Starting price
Not public
Free access
Not disclosed
Sports
3 (Multi-sport (40+), Football (soccer)…)
Live data
Not disclosed
Delivery
Streaming (Push feed)
Discussions
4 threads
GitHub adoption
38 repos

Best for

Developers building trading tools on the Smarkets betting exchange with the streaming API and Python client.

Exchange trading toolsMarket data streaming

Not ideal for

Nothing stated on its pages.

Limitations to check

  • − No pages saved for verification
  • − Only covers the Smarkets exchange

Written from the provider's own pages (source).

Last checked 2026-11-03

Smarkets at a glance

What is Smarkets best for?
Developers building trading tools on the Smarkets betting exchange with the streaming API and Python client.
How much does Smarkets cost?
Smarkets does not publish prices on the pages we checked.
Does Smarkets have a free tier?
Smarkets does not say whether a free tier exists. Check https://smarkets.com.
What does Smarkets cover?
Smarkets is a betting exchange. Its sports: Multi-sport (40+), Football (soccer), Horse racing; data: Trading & risk, Odds.
Does Smarkets have a WebSocket or streaming API?
Yes. Smarkets pushes data continuously: Push feed.
What do developers say about Smarkets?
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.
What are the alternatives to Smarkets?
Close alternatives in the SportDex catalog: Matchbook Exchange, Polymarket, BETDAQ, ProphetX, SX Bet.

Commercial decision

Pricing & plan limits

No public price list. Check the provider site.

No pre-crawled pages. Standard commission reported as 2% of net winnings by a third party (pm.wiki), not confirmed on Smarkets site. docs_url is the commonly used docs host, not fetched. Auth type unconfirmed (session login/token).

Before choosing a paid plan, confirm

• What counts as one request (per call, per market, per region?)

• What happens when you exceed the quota: blocked or billed

• Whether live and historical data are on your plan

• Whether your use (public app, betting, resale) is licensed

The critical question

Data coverage

Sports
Multi-sport (40+)Football (soccer)Horse racing
Data types
Trading & riskOdds
Key competitions
Not disclosed
Competitions
Not disclosed
Live / in-play
Not disclosed
Women's competitions
Not disclosed
Betting markets
Not disclosed
Bookmaker regions
Not disclosed
Bookmakers
Not disclosed
History depth
Not disclosed
Update frequency
Not disclosed
Name languages
Not disclosed
ID mapping
Not disclosed

Coverage often depends on the plan; confirm the exact league and season on your plan.

Before you build

Usage rights & access

Commercial use
Not disclosed
Betting products
Not disclosed
Redistribution
Not disclosed
Storing data
Not disclosed
Attribution
Not disclosed
Logos & photos
Not disclosed
Who can buy
Not disclosed
Verification (KYC)
Not disclosed
Not available in
Not disclosed
Only available in
Not disclosed

Developer-ready evaluation

Integration & documentation

Protocols
Push feed
Formats
Not disclosed
Authentication
api key
SDKs
python
OpenAPI spec
Not disclosed
Claimed latency
Not disclosed
Status page
Not disclosed
Sandbox / test keys
Not disclosed
Support
Not disclosed
SLA uptime
Not disclosed
Preview brief
# Integration brief: Smarkets

Goal: build a feature on Smarkets data. Use only the official documentation below as the source of truth.

## Known facts (from SportDex, verify before relying on them)
- Website: https://smarkets.com
- Docs: https://docs.smarkets.com/
- Sports: Multi-sport (40+), Football (soccer), Horse racing
- Data: Trading & risk, Odds
- Protocols: Push feed; formats: UNKNOWN — check the docs
- Auth: api_key
- Free plan: none listed
- Note: No pre-crawled pages. Standard commission reported as 2% of net winnings by a third party (pm.wiki), not confirmed on Smarkets site. docs_url is the commonly used docs host, not fetched. Auth type unconfirmed (session login/token).

## Verify before writing code
- pricing and request limits
- live update frequency
- whether commercial use is allowed on the plan you pick
- exact endpoint paths, parameters and response fields (read the official docs, do not guess)

## Implementation rules
- Keep the API key on the server (environment variable, backend route or edge function); never ship it to the browser.
- Cache responses and respect rate limits; count how many requests each screen triggers.
- Handle errors explicitly: invalid key, quota exceeded (429), missing fields, empty fixtures, timeouts.
- Start with one demo request and log the raw response before building UI on assumed field names.

Data quality signals

Data source & company

Official partners
Not disclosed
How data is collected
Not disclosed
Certifications
Not disclosed
Payment methods
Not disclosed
Minimum contract
Not disclosed
Country
United Kingdom
Founded
Not disclosed

Reddit · Hacker News · Stack Overflow · GitHub · YouTube

What developers say

Too little discussionalternativesdata quality

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.

Praised for

  • Free API since early days
  • Exchange alternative to Betfair

Complaints

  • Missing contracts in market data

Our summary of public discussions, not a rating. Vendor posts are not counted as user opinion.

Discussions

Shortlist next steps

Alternatives worth comparing

  • Matchbook ExchangeBetting exchange30

    UK betting exchange offering a REST API for markets, offers and account data; read-only market data reportedly works without login, trading needs a funded account.

    Multi-sport (40+)
    Price not public0 discussions · 17 repos
  • PolymarketBetting exchange67

    Prediction market exchange whose public Gamma API lists markets and events, including sports, without credentials; separate trading APIs and SDKs exist.

    Free tierMulti-sport (40+)
    Free tier52 discussions · 4.5k repos
  • BETDAQBetting exchange29

    UK betting exchange whose webservice API is open to verified account holders for a one-off fee, and which offers a streaming commercial API to operators.

    Multi-sport (40+)
    from £250 one-time8 discussions · 3 repos
  • ProphetX logo
    ProphetXBetting exchange18

    US peer-to-peer sports prediction exchange offering trading, market data and parlay APIs plus WebSocket flows for market makers, covering major US and global sports.

    ⚡ StreamingAmerican footballIce hockeyCollege sports+6
    Price not public1 discussions · 2 repos
  • SX BetBetting exchange51

    Peer-to-peer crypto sports betting exchange with a public REST API for markets and orders and a realtime WebSocket feed for order books, scores and line updates.

    Free tier⚡ StreamingMulti-sport (40+)
    Free tier4 discussions · 77 repos
Polymarket vs SmarketsBetfair Exchange API vs SmarketsSX Bet vs Smarkets

Evidence & transparency

Official sources

Facts were extracted from the provider's own pages on 2026-11-03. Empty fields mean the provider does not say, not that the feature is missing. How we know