Betting exchange API for lay prices

The OddsRelay API carries Smarkets, Matchbook and BETDAQ prices as data: each lay price and the money available at it, beside the back prices of bookmakers in the UK & Ireland. It is read-only and pre-match, and places no bets. Every plan includes it, the free one too.

Do Smarkets, Matchbook and BETDAQ have their own APIs?

Yes. Each runs an API for its own account holders. OddsRelay is an odds feed, not a betting account: one key reads their prices beside every bookmaker's, in one JSON shape.

Feeds and API keys

Each exchange’s own page lists the sports on each feed.

Exchanges, by feed
Exchange	API key	Standard	Raw	Each-way	Extra place	Best odds guaranteed	2Up	Dutching
Smarkets	smarkets	Covered	Covered	Covered	Covered	Covered	Covered	Covered
Matchbook	matchbook	Covered	Covered	Covered	Covered	Covered	Covered	Covered
BETDAQ	betdaq	Covered	Covered	Covered	Covered	Covered	Covered	Covered

SmarketssmarketsStandard, Raw, Each-way, Extra place, Best odds guaranteed, 2Up, Dutching
MatchbookmatchbookStandard, Raw, Each-way, Extra place, Best odds guaranteed, 2Up, Dutching
BETDAQbetdaqStandard, Raw, Each-way, Extra place, Best odds guaranteed, 2Up, Dutching

Sports covered

Every sport OddsRelay covers each exchange on, across its feeds, from the coverage summary.

Sports covered on each exchange, across its feeds
Exchange	Sports
Smarkets	American football, Aussie rules, Baseball, Basketball, Boxing, Cricket, Darts, Esports, Football, Golf, Greyhound racing, Handball, Horse racing, Ice hockey, MMA, Rugby union, Snooker, Table tennis, Tennis
Matchbook	American football, Baseball, Basketball, Boxing, Cricket, Football, Golf, Greyhound racing, Horse racing, Ice hockey, MMA, Tennis
BETDAQ	American football, Baseball, Basketball, Cricket, Football, Greyhound racing, Horse racing, Ice hockey, MMA, Rugby union, Tennis

What a reply carries

On every matched feed but dutching, each outcome lists the bookmakers' back prices, best first, beside the exchange lay prices, lowest first. A lay offer carries exchange, price, available and link, and available is the money available at that price. On the each-way and extra-place feeds, lay splits into lay.win and lay.place.

The matched feeds pair against Betfair, Smarkets, Matchbook and BETDAQ. To keep the lay side to the exchanges on this page, pass exchanges=smarkets,matchbook,betdaq, as Filtering matched odds shows.

On the raw feed an exchange's outcomes carry back_price, lay_price and available side by side, and exchangesOnly=true returns the exchanges alone. On dutching, an exchange's back price can be one of the legs.

Prices are as each exchange quotes them. No commission is applied, so your own rate goes into your arithmetic.

Example · recorded 17 Sep 2026, 03:27 UK time · one event, one market, one outcome

{
  "meta": {
    "feed_type": "standard",
    "region": "uk",
    "odds_format": "decimal",
    "processed_at": "2026-09-17T02:27:33.874Z"
  },
  "data": [
    {
      "event_id": "or_evt_beecb9c3d748",
      "sport_key": "soccer_england_national_league",
      "sport_title": "England - National League",
      "commence_time": "2026-09-18T18:45:00Z",
      "home_team": "Yeovil Town",
      "away_team": "Solihull",
      "markets": [
        {
          "key": "h2h",
          "outcomes": [
            {
              "name": "Draw",
              "back": [
                {
                  "bookmaker": "unibet",
                  "price": 3.7,
                  "link": "https://www.unibet.co.uk/betting/odds/football/england/national-league/yeovil-town-vs-solihull-moors/c299eb5aa08e90993d9c0a296a2f0448"
                },
                {
                  "bookmaker": "fanteam",
                  "price": 3.67,
                  "link": "https://www.fanteam.com/sportsbook#/event/17185185"
                }
              ],
              "lay": [
                {
                  "exchange": "smarkets",
                  "price": 4,
                  "available": 21.8,
                  "link": "https://smarkets.com/sport/football/england-national-league/2026/09/18/18-45/yeovil-town-vs-solihull-moors/45317352/"
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}

OddsRelay is not affiliated with or endorsed by Smarkets, Matchbook or BETDAQ.

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