kalshi.markets

beta Advanced

Open Kalshi prediction markets.

GET /v1/kalshi/markets

What you get#

A list of Kalshi results in Onekey's unified shape, in data (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free 404 not_found instead.

What it costs#

Advanced · 5 credits for a fresh fetch, charged only when it succeeds.
Free when served from cache (0.2 credit for a cached response over 100 KB).
Free if the request is invalid (never charged) or the source fails or reports not found (refunded).

Parameters#

Name	Type	Required	Default	What it is	Constraints
`limit`	string	no	`20`	Rows (1-100)	max 3 chars; must match `[1-9]\d?\|100`; trimmed

Request#

curl "https://api.onekey.dev/v1/kalshi/markets?limit=5" \
  -H "x-api-key: YOUR_API_KEY"

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

Recorded response#

A real Kalshi response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": [
    {
      "entity": {
        "id": "KXHIGHNY-26SEP29-T80",
        "name": "Highest temperature in NYC on Sep 29, 2026 above 80?",
        "description": "81 or above",
        "category": "active",
        "date": "2026-09-30T04:59:00Z"
      },
      "ext": {
        "eventTicker": "KXHIGHNY-26SEP29",
        "yesBid": 42,
        "yesAsk": 44
      },
      "market": {
        "price": 43,
        "volume": 12800,
        "volume24h": 3400,
        "openInterest": 5100
      }
    }
  ],
  "metadata": {
    "platform": "kalshi",
    "endpoint": "markets",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 5,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}

Field mapping#

How this endpoint's source fields become Onekey's unified schema. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`ticker`	`entity.id`	-
`title`	`entity.name`	-
`subtitle`	`entity.description`	-
`event_ticker`	`ext.eventTicker`	-
`status`	`entity.category`	-
`yes_bid`	`ext.yesBid`	`toNumber`
`yes_ask`	`ext.yesAsk`	`toNumber`
`last_price`	`market.price`	`toNumber`
`volume`	`market.volume`	`toNumber`
`volume_24h`	`market.volume24h`	`toNumber`
`open_interest`	`market.openInterest`	`toNumber`
`close_time`	`entity.date`	`toIsoDate`

Caching and freshness#

Fresh for about 2 minutes. Repeat calls in that window are served from cache and are free.
Between 2 minutes and 15 minutes the cached copy is still served instantly and marked stale: true while Onekey refreshes it in the background.
If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
A "not found" is remembered for 1 minute and is free.
The cache is shared across all customers, which is what keeps repeat calls cheap.

What can go wrong#

Status	Code	What to do
401	`unauthorized`	Check the `x-api-key` header.
402	`insufficient_credits`	Add credits; your balance must cover the price.
404	`not_found`	Unknown endpoint path.
422	`invalid_params`	Fix the parameters using the table above. Free.
429	`rate_limited`	Wait `Retry-After` seconds, then retry.
502	`upstream_error`	The source failed. Refunded; retry with backoff.

See Errors for the full list and retry guidance.

Status: beta (not yet verified against the live source).