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Odds-API.io vs SportsGameOdds: which odds API should you use?

Odds-API.io vs SportsGameOdds compared from each vendor's own pages (checked 3 Nov 2026): free tiers, pricing, rate limits, bookmakers, leagues, Polymarket/Kalshi, WebSocket, historical data, props, MCP, docs and support.

Try Odds-API.io Quick answer

Last updated: · Written and reviewed by Ken Lin

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Quick answer

Verdict

Pick Odds-API.io if you need global breadth (450+ bookmakers, 12,000+ leagues, Asian handicaps, esports), Polymarket and Kalshi prices with order-book depth, ready-made value-bet and arbitrage endpoints, or WebSocket streaming on an entry-level plan (it doubles the plan price, from £98/mo) [1] [2] [3].

Pick SportsGameOdds if you build for US sports and player props, want DFS lines (PrizePicks, Underdog) with scores and settlement in the same feed, need a free tier to start (Amateur: 2,500 objects a month, card required), or prefer per-event billing that does not charge per bookmaker [4] [5]. Its WebSocket stream needs the custom All-Star plan and historical data starts at Pro [6].

Odds-API.io pricing Partner link SportsGameOdds plans Partner link

Both vendor links on this page are partner links: if you sign up through them we may earn a commission at no extra cost to you. It does not change the facts below, which come from each vendor's own pages. ↓

Side-by-side comparison

Checked on 3 November 2026. Both vendor links on this page are partner links: if you sign up through them we may earn a commission at no extra cost to you. It does not change the facts below, which come from each vendor's own pages.

Odds-API.ioSportsGameOdds
Free tierNew free keys paused; existing free keys keep 100 requests/hour, capped at 500/day [7] [8]Amateur: free, 2,500 objects/month, 10 requests/min, 10-min updates, 8 leagues, 9 bookmakers; card required, never charged [4]
Paid plansSolo £49/mo (2 bookmakers), Starter £99 (5), Growth £179 (10), Pro £229 (15); annual = 10× monthly; Enterprise on request [2]Rookie $149/mo monthly or $99/mo billed annually; Pro $499/mo or $299/mo annually; All-Star custom [5] [6]
How usage is countedRequests: 5,000/hour on every plan; add-ons +£139 (10k/h), +£229 (20k/h), +£309 (30k/h) [2]Objects (one per event returned, however many markets/books) plus requests per minute: 10 / 50 / 300 / unlimited; shared ceilings 50,000 requests/hour and 250,000 objects/hour [5]
Bookmakers450+ in the catalogue; your plan picks 2–15 of them [1] [2]85+ overall; 9 / 77 / 82 / 82+ by plan [4] [5]
Sports and leagues34 sports, 12,000+ leagues and competitions [1]28+ sports, 67+ leagues; 8 / 17 / 53 / 53+ leagues by plan [4] [5]
Markets500+ market types incl. moneyline, Asian handicap, totals, player props, correct score [1]1,630+ markets incl. spreads, moneylines, totals, partial-game, player and team props, alt lines [4]
Polymarket / KalshiYes, sports events; normalised to decimal odds with top-of-book depth in USD [3]Yes, Kalshi and Polymarket alongside sportsbooks; depth fields not stated [4]
Live odds / WebSocketLive and pre-match on every plan; WebSocket add-on on any plan at 2× the plan price [2] [9]Live and pre-match on every plan; updates every 10 min / 3 min / sub-minute by plan; WebSocket only on All-Star (custom) [5] [10]
Historical dataHistorical events, odds, closing lines and odds movements endpoints; plan availability not stated [1]Pro plan and above; availability varies by league [6] [4]
Value / arbitrageDedicated /value-bets and /arbitrage-bets endpoints [8] [11]Fair odds and consensus (vig removed) on every plan; dedicated arbitrage/value endpoint not stated [5]
Scores and settlementnot stated as a feature on the pages checkedLive scores, results, box scores, team/player stats and settlement on every plan [5]
MCP / AIOfficial MCP server, 25 read-only tools, stdio; llms.txt and OpenAPI [12] [13]Official MCP server (npx -y sports-odds-api-mcp); llms.txt and AI context [14] [6]
SDKs and docsPython and Node.js/TypeScript SDKs; docs, OpenAPI [15]SDKs for TypeScript/JavaScript, Python, Ruby, Go, Java; docs and FAQ [16] [4]
SupportEmail (Solo, Starter), priority (Growth), dedicated (Pro) [2]Email, live chat and Discord [17]
CurrencyGBP (checkout shows local currency) [2]USD [5]

“not stated” means we could not find the item on the vendor's own pages on the check date; it may still exist. Prices exclude tax and were not converted between currencies.

Pros and cons

Odds-API.io

Pros

  • Widest catalogue: 450+ bookmakers, 12,000+ leagues
  • Polymarket/Kalshi with depth in the same schema
  • Value-bet and arbitrage endpoints out of the box
  • WebSocket on every plan (paid add-on)

Cons

  • No new free keys
  • Each plan limits how many bookmakers you can pick (2–15)
  • WebSocket doubles the bill

SportsGameOdds

Pros

  • Free tier still open (card required)
  • Per-event object billing: all books on a plan for one object
  • US sports, props and DFS lines with scores and settlement
  • SDKs in five languages

Cons

  • WebSocket only on the custom All-Star plan
  • Free tier: 8 leagues, 10-minute updates
  • Historical data from Pro ($299–$499/mo)

Which one for your use case?

Use caseBetter fit
Global soccer, tennis or esports; Asian booksOdds-API.io
US props / DFS tools with settlementSportsGameOdds
Prediction-market vs bookmaker researchOdds-API.io (depth fields documented)
Prototype at zero costSportsGameOdds Amateur
Low-latency streaming on a small budgetOdds-API.io + WebSocket
AI agent over MCPBoth have an official MCP server
Odds-API.io pricing Partner link SportsGameOdds plans Partner link

Both vendor links on this page are partner links: if you sign up through them we may earn a commission at no extra cost to you. It does not change the facts below, which come from each vendor's own pages. ↓

How we compared

Checked on 3 November 2026 against each vendor's own pricing page, homepage, documentation and llms.txt (linked in every cell). We did not run paid keys on either service, so speed, uptime and accuracy claims are the vendors' own and are not repeated as facts. Pred-Data has partner links with both vendors.

Frequently asked questions

Is SportsGameOdds cheaper than Odds-API.io?

It depends on how you count. SportsGameOdds bills per event object and includes all bookmakers on a plan; Odds-API.io bills a flat plan with 5,000 requests per hour and a fixed number of bookmakers. SportsGameOdds has a free tier; Odds-API.io paid plans start at £49 a month.

Which has WebSocket streaming?

Both. Odds-API.io sells it as an add-on on any plan for 2× the plan price; SportsGameOdds includes it only on the custom All-Star plan.

Do both cover Polymarket and Kalshi?

Yes. Odds-API.io documents top-of-book depth in USD for them; SportsGameOdds lists both alongside sportsbooks but we found no depth fields stated.

Which is better for AI agents?

Both publish an official MCP server and an llms.txt. Odds-API.io's server has 25 read-only tools; SportsGameOdds' runs with npx -y sports-odds-api-mcp.

Does either offer historical odds?

Yes. Odds-API.io lists historical events, odds and closing-line endpoints; SportsGameOdds includes historical data from the Pro plan.

About this guide

Pred-Data publishes independent, source-linked explainers about prediction markets and the AI tools used around them. Every factual claim on this page links to a primary or reputable secondary source, checked on the date shown above. We do not run a trading venue, take bets, or give personal advice.

Author: Ken Lin · Corrections: if you spot an error, we review it and date-stamp the fix.

Affiliate disclosure

Some links on this site (marked “Partner link”) may be affiliate links: if you sign up through them we may earn a commission at no extra cost to you. Partner links use rel="sponsored nofollow" and never change our assessment. Platform links in our comparison tables are plain, non-affiliate links to official sites.

Sources

  1. Odds API llms.txt (coverage, endpoints incl. historical) — Odds-API.io, accessed 2 Nov 2026
  2. Odds API Pricing (plans, WebSocket add-on, extra requests, payment) — Odds-API.io, accessed 2 Nov 2026
  3. Prediction Markets guide (Polymarket, Kalshi: back/lay, depth) — Odds-API.io docs, accessed 2 Nov 2026
  4. SportsGameOdds — homepage (coverage, features, FAQ) — SportsGameOdds, accessed 2 Nov 2026
  5. SportsGameOdds — pricing & rate limits — SportsGameOdds, accessed 2 Nov 2026
  6. SportsGameOdds llms.txt (plans, WebSocket, historical, MCP, docs index) — SportsGameOdds, accessed 2 Nov 2026
  7. Free Odds API: New Free Keys Are Paused — Odds-API.io, accessed 2 Nov 2026
  8. Value Bets guide (EV formula, response format, limitations) — Odds-API.io docs, accessed 2 Nov 2026
  9. WebSocket guide (wss://api.odds-api.io/v3/ws, markets filter, reconnects) — Odds-API.io docs, accessed 2 Nov 2026
  10. SportsGameOdds docs — Real-time streaming API (WebSocket) — SportsGameOdds, accessed 2 Nov 2026
  11. Arbitrage Bets guide (formula, response format, limitations) — Odds-API.io docs, accessed 2 Nov 2026
  12. Odds API MCP server — Odds-API.io, accessed 2 Nov 2026
  13. AI & Vibe Coding (llms.txt, OpenAPI, copy-paste context, MCP setup) — Odds-API.io docs, accessed 2 Nov 2026
  14. SportsGameOdds docs — AI-assisted development (MCP server) — SportsGameOdds, accessed 2 Nov 2026
  15. SDKs & Libraries (Python, Node.js/TypeScript, MCP) — Odds-API.io docs, accessed 2 Nov 2026
  16. SportsGameOdds docs — SDK guide — SportsGameOdds, accessed 2 Nov 2026
  17. SportsGameOdds docs — Support (email, live chat, Discord) — SportsGameOdds, accessed 2 Nov 2026