API

Price history

The chance of a market’s first outcome over time, for charts.

GEThttps://backd.market/api/v1/markets/{eventSlug}/historycached 60 seconds

Request

curl "https://backd.market/api/v1/markets/{eventSlug}/history?market=4609859&range=1d"

Parameters

Name	In	Type	Description
`eventSlug`required	path	string	The event’s slug.
`market`	query	string	Which market in the event. Defaults to the first. Example: `4609859`
`range`	query	string	1d, 1w, 1m or max. Default 1w. Example: `1d`

Response

200 OK

{
  "ok": true,
  "market_id": "4609859",
  "question": "Will Spain win on 2026-09-29?",
  "outcome": "Yes",
  "range": "1d",
  "points": [ { "t": 1790640000, "chance": 0.82 }, { "t": 1790640600, "chance": 0.83 }, "…" ]
}

Fields

Field	Type	Meaning
`points[].t`	integer	Unix time in seconds.
`points[].chance`	number	Chance of the first outcome at that time, 0 to 1.