The Racing API

Extensive racecards, results and odds data for horse racing from around the world. While the bulk of their data comes from UK & Irish racing, users can also access data for major races and events globally, including France, USA, Australia, Hong Kong, UAE and South Africa.

Any programming language can be used to connect to the API, which serves data from a database of over 200,000 results and racecards spanning 12+ years.

Information is provided on a subscription basis, giving access to full UK and Ireland racing, with the database being updated every 10 minutes.

They offer 4 levels of subscription:

Free Plan provides daily basic racecards;
Basic Plan provides advanced racecards, live results for all races on daily racecards, historical results for each horse and regular API and feature updates;
Standard Plan provides daily advanced racecards, with 20+ bookmaker odds for UK & Irish racing, live results, historical results with advanced queries for all races in the last 12 months. Search horses, jockeys, trainers, owners and more, plus analysis endpoints with win percentage, a/e and 1 unit profit/loss;
Pro Plan provides all the benefits of the standard plan, plus past and future advanced racecards and additional add-on options.