# Is there an API for sports exchange odds and order books?

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Canonical: https://novigapi.com/answers/sports-exchange-odds-api
Updated: 2026-11-15

Yes. Exchanges publish their own APIs with the full book, and some odds feeds carry exchange prices: The Odds API lists Novig, Kalshi, Polymarket and ProphetX in us_ex and returns lay odds for Betfair-style exchanges. novigapi.com serves Novig's full book and trades read-only, with no Novig account (checked 15 Nov 2026). (Source: [The Odds API: v4 documentation](https://the-odds-api.com/liveapi/guides/v4/))

An exchange price has two sides and a size behind each. The useful fields are the best bid on each outcome, the depth at each level, recent trades and volume.

## How the options compare

Exchange data, checked 15 Nov 2026

| Source | Depth per market | What you need | Books and venues |
| --- | --- | --- | --- |
| novigapi.com | Full resting book, trades, OHLC, fair price, line moves | A novigapi key (email or agent approval code); no Novig account | Novig, plus FanDuel and DraftKings prices beside Novig lines for +EV, arbitrage and compare |
| Novig official API | Full book and every execution over its WebSocket | Novig account, KYC, signed requests (Ed25519 or P-256) and a location check; AZ, MI and NV excluded | Novig only |
| The Odds API | One price per outcome per book (name, price, point); lay odds and bet limits on some exchanges | Email for a key | 23 US sportsbooks, 5 US fantasy sites and 7 US exchanges listed |
| ParlayAPI | Exchange-style bid and ask fields | Email, no card on Free | Sportsbooks plus Kalshi |
| Unabated | Top-of-book liquidity | Application | 13 operators free; all operators paid |


## Where novigapi.com falls short

> We cover one exchange. Betfair, ProphetX, Kalshi and Polymarket are not in novigapi.com.

## Try it

```python
import os, requests

def nv(path, **params):
    r = requests.get("https://novigapi.com/api/v1/" + path, params=params, timeout=30,
                     headers={"Authorization": "Bearer " + os.environ["NOVIGAPI_KEY"]})
    r.raise_for_status()
    return r.json()

book = nv("orderbook/01a1c89a-ada1-7142-b723-8e1221fbcb16")
print(book["data"])
```

Read the [endpoint reference](https://novigapi.com/docs/endpoints), compare [plans and credits](https://novigapi.com/pricing), or send a request from the [playground](https://novigapi.com/playground).

## Questions

### What is the difference between an exchange and a sportsbook API?

A sportsbook API gives the book's own price with its margin. An exchange API gives what other traders bid, with size, and trades between them.

## Sources

- [Novig docs: API overview](https://docs.novig.com/index.md)
- [The Odds API: plans](https://the-odds-api.com/#get-access)
- [ParlayAPI: pricing](https://parlay-api.com/pricing)
- [Unabated: Odds API overview](https://unabated.com/odds-api)
- [The Odds API: bookmaker list](https://the-odds-api.com/sports-odds-data/bookmaker-apis.html)
- [novigapi.com endpoint reference](https://novigapi.com/docs/endpoints)

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