Course statistics

GET /v1/courses/{course_id}/stats

The standard block for everything run there.

Available on

Free key not on this plan

Live not on this plan

Archive not on this plan

Complete not on this plan

Complete + Analyst 2017 → upcoming

Send your key in the X-API-Key header, or as ?key= if your tool cannot set one. A date outside your plan's window returns 403 outside_window naming the window, never an empty array.

Parameters

Name	In	Type	Required	Description
course_id	path	string	yes	Opaque course identifier.
by	query	string	no	A breakdown dimension: run_type, distance, going, surface, class, year, month, draw, field_size, layoff, sp_band, trainer, jockey, owner or sire.
min_runs	query	integer	no	Drop breakdown rows with fewer runners than this. Defaults to 1.
date_from	query	string	no	YYYY-MM-DD. Clamped to your plan's window.
date_to	query	string	no	YYYY-MM-DD. Clamped to your plan's window.

Request

curl https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/stats \
  -H "X-API-Key: $AHR_KEY"

$ch = curl_init('https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/stats');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER     => ['X-API-Key: ' . getenv('AHR_KEY')],
]);
$data = json_decode(curl_exec($ch), true)['data'];

const res = await fetch(
  'https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/stats',
  { headers: { 'X-API-Key': process.env.AHR_KEY } }
);
const { meta, data } = await res.json();

import os, requests

r = requests.get(
    "https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/stats",
    headers={"X-API-Key": os.environ["AHR_KEY"]},
).json()

Response

200 OK application/json harvested 8 days ago

{
    "meta": {
        "request_id": "b1f322bb222f4297",
        "data_as_of": "2026-09-12T05:10:27+00:00",
        "plan": "analyst",
        "window": "2017 → upcoming",
        "count": 1
    },
    "data": {
        "course_id": "cr_JSRC8Z",
        "course": "Fontwell",
        "window": {
            "from": null,
            "to": null,
            "note": "The whole archive. Your plan sets no date limit."
        },
        "overall": {
            "runs": 10351,
            "priced": 10305,
            "first": 1316,
            "second": 1312,
            "third": 1270,
            "fourth": 1145,
            "win_pct": 0.1271,
            "top3_pct": 0.3766,
            "expected_wins": 1315,
            "a_e": 1.001,
            "a_e_range": [
                0.947,
                1.055
            ],
            "a_e_beats_market": false,
            "significant": false,
            "low_sample": false,
            "pl_1pt": -2745.33,
            "roi_pct": -26.64
        },
        "by": "course"
    }
}

A real response from /v1/courses/cr_JSRC8Z/stats?by=course&limit=3, captured by calling the live API rather than written by hand.

Response fields

Each field is described once and rendered on every endpoint that returns it, so the wording cannot drift between pages.

Field	Type	What it is
course_id	string	Opaque course identifier.
course	string	Course name.
window	string	How far back and forward that plan can read.
runs	integer	Rides in the slice, priced or not.
priced	integer	Rides carrying a starting price. A/E and the profit figures use these; runs is the wider count.
first	integer	Wins.
second	integer	Seconds. Positions are returned separately so you apply your own place terms.
third	integer	Thirds.
fourth	integer	Fourths.
win_pct	number	Wins over runs. The number everyone quotes and the one that tells you least.
top3_pct	number	First, second or third over runs. Not a place strike rate; place terms vary.
expected_wins	number	Wins the market implied, summed over the slice.
a_e	number	Actual wins over expected. Above 1.00 means winning more often than the prices said.
a_e_range	array	Ninety five percent interval on A/E. If it spans 1.00 the figure is not evidence of anything.
a_e_beats_market	boolean	True only where the whole interval sits above 1.00.
significant	boolean	Whether the interval excludes 1.00 in either direction.
low_sample	boolean	Fewer than five expected wins. Treat A/E as noise.
pl_1pt	number	One point on every runner, settled at starting price.
roi_pct	number	Level stakes return. Backing everything loses more than the book margin, because equal stakes overweight the longshots.

Errors this endpoint returns

Code	Status	When
unauthorized	401	No key, or one we do not recognise. Check the header name and that the key has not been rotated from your account page.
upgrade_required	403	The endpoint returns computed statistics and your plan does not include them. The body names every plan that does reach it, so you never have to look it up.
not_found	404	The identifier is well formed but nothing has it. Distinct from invalid_id, which means the identifier itself is wrong.
invalid_id	422	The prefix does not match the kind of thing the path expects, or the identifier is malformed. A horse id passed where a race is wanted lands here rather than returning the wrong race.
invalid_param	422	A date that is not YYYY-MM-DD, a by= dimension we do not have, or a cursor that did not come from us. The message names the parameter.
rate_limited	429	Past your per-minute rate. Retry-After is set, and X-RateLimit-Remaining tells you where you stand on every successful response too.
server_error	500	Ours, not yours. Every response carries a request_id; quote it and we can find the exact request.

Run it live

A real request from your browser straight to api.apihorseracing.com with your own key. Nothing is proxied and nothing is logged by this page.

Your API key

Remembered in this browser so you do not paste it on every page.

course_id

by optional

min_runs optional

date_from optional

date_to optional

What this is for

The standard statistics block for everything run at one course, split any of fifteen ways. The base a course study starts from.

A course A/E close to 1.00 overall is expected and is not a failure of the endpoint. The market prices races at each track knowing the track, so the interesting figures are always in the breakdowns rather than in the total.

by=trainer here is the same question as by=course on a trainer, asked from the track's side. Which is often the more useful direction, because a course has far more runners than any one yard and the rows are correspondingly better supported.

Common uses

Finding the yards that target a track

by=trainer with min_runs=30. This is the version of the question with enough data behind it to answer.

Checking whether a distance behaves differently

by=distance. Some tracks have a trip that rides nothing like the others.

Establishing a baseline

Before claiming anything about a course, know what its ordinary numbers look like.

Notes

by=course and by=region are rejected here with invalid_param, since both are fixed for a single course.