Prediction markets API

Which sports leagues can I find prediction markets for?

The sports leagues a prediction venue lists markets under: league code, the venue's own league, series and tag ids, settlement source and logo.

GET/api/external/prediction/prediction-sports-leagues

Get a free API key Try it in the API reference

What it returns

One row per sports league a prediction venue lists markets under: its short league code (ufl, nascar, cricipl), the venue, the venue's own league, series and tag ids for it, the source that settles its markets and its logo. Every row measured was on polymarket. The ids are the venue's own and no other endpoint of this API takes them as input; use league as search text on GET /prediction/prediction-search to find a league's markets. Rows come in the venue's own order, which is neither alphabetical nor by popularity. At most 200 leagues are listed. No chain and no subject.

Chains

This endpoint is not tied to a chain: it takes no chain in its request.

Request

Send your key in the x-dex-data-key header. Replace each <placeholder> with a real value.

curl -H "x-dex-data-key: $DEXDATA_API_KEY" \
  "https://api.dexdata.io/api/external/prediction/prediction-sports-leagues"

Parameters
Parameter	Description
`limit` query · integer · optional	How many leagues to return, from the top of the list. Defaults to 200, the whole list, which is also the most.

Response fields

A JSON response. Every field is always present; null means the value could not be established, never zero.

Response fields of Which sports leagues can I find prediction markets for?
Field	Type	Description
`leagues`	object[]	In the venue's own order. Never empty.
`leagues[].league`	string	The league's short code on its venue, lowercase, e.g. `ufl`, `lmp`, `nascar-xfinity`, `cricpakt20cup`.
`leagues[].venue`	string	The venue, lowercase, e.g. `polymarket`. Open set: new venues can appear.
`leagues[].leagueId`	string	The venue's own numeric id for the league, as a string.
`leagues[].seriesIds`	string[]	The venue's own numeric ids of the market series the league's games are listed in. Usually one; empty when the venue gives none.
`leagues[].tagIds`	string[]	The venue's own numeric tag ids for the league, general ones (sports, games) included.
`leagues[].resolutionSource`	string \| null	Where the league's markets are settled from, usually the league's official site URL; null when the venue gives none.
`leagues[].image`	string \| null	The league's logo URL, or null when it has none.

Price per call

Every call: 18 credits

Charged only when the call succeeds. Prices as of 2026-10-30; the current ones are always in the API reference.

Which prediction markets, events or traders match this text?
A league code found here is the search text that finds that league's markets.
What did this crypto up-or-down window open and close at?
The reference open ("price to beat") and close of one 5-minute or 1-hour crypto window, e.g. BTC 14:30–14:35; the close is null until the window settles.
How did the price move across this crypto up-or-down window?
The reference price path across one 5-minute, 15-minute or 1-hour crypto window, with its first and last price; the 15-minute open and close come from here.
What is a prediction market's open interest, and how many holders and trades?
Contracts open right now and lifetime volume (Kalshi), or lifetime volume, distinct holders and trade count (Polymarket), for one market. Counts, not USD.
The full category taxonomy prediction markets are sorted under
The taxonomy prediction events are filed under. Read it to learn the vocabulary an events query can filter by; it answers no question about any one event.
One prediction-market event's identity, lifecycle and windowed stats
One event: what is being bet on, whether it is open or settled, and its windowed activity. The markets that price it are a separate read.

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