Draw bias

Parameters

Request

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

$ch = curl_init('https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/draw-bias');
curl_setopt_array($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/draw-bias',
  { 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/draw-bias",
    headers={"X-API-Key": os.environ["AHR_KEY"]},
).json()

curl https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/draw-bias?key=$AHR_KEY

$url  = 'https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/draw-bias' . '?key=$AHR_KEY';
$data = json_decode(file_get_contents($url), true)['data'];

const res = await fetch(
  'https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/draw-bias?key=$AHR_KEY'
);
const { meta, data } = await res.json();

import os, requests

r = requests.get(
    "https://api.apihorseracing.com/v1/courses/cr_JSRC8Z/draw-bias?key=$AHR_KEY",
).json()

Response

{
    "meta": {
        "request_id": "9ec3c1f9249ae1cd",
        "data_as_of": "2026-09-12T05:10:27+00:00",
        "plan": "analyst",
        "window": "2017 → upcoming",
        "count": 0
    },
    "data": {
        "course_id": "cr_JSRC8Z",
        "course": "Fontwell",
        "distance": "all",
        "window": {
            "from": null,
            "to": null,
            "note": "The whole archive. Your plan sets no date limit."
        },
        "by_third": [],
        "by_stall": [],
        "note": "Only races with a recorded draw and six or more runners.",
        "distances_available": []
    }
}

A real response from /v1/courses/cr_JSRC8Z/draw-bias, 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.

Errors this endpoint returns

Run it live

What this is for

Whether starting position matters here. The field is split into low, middle and high thirds by stall number, and each third gets a full statistics block including A/E, so the question asked is whether a stall beat its price rather than whether it won.

Thirds rather than individual stalls, deliberately. Individual stall numbers across varying field sizes produce rows with a handful of runners each and an apparently dramatic pattern that is entirely noise. Thirds are comparable across field sizes and have enough behind them to say something.

Ask for a single distance. Draw bias is a property of a course, a distance and often a going, and averaging a five furlong sprint together with a mile and a half will reliably show no effect at a track where a real one exists.

Expect most of these to come back insignificant, and treat that as the endpoint working. Draw bias is genuine at a handful of tracks and folklore at most of the rest, and the interval is what separates the two.

Common uses

Notes

Only flat racing carries a draw. Jumps races return an empty result rather than an error, because having no draw is a fact about the race rather than a failure of the query.

Related in Courses & bias