Prediction markets API

Is each prediction venue open and trading right now?

Per venue: whether its exchange and its trading are active right now, and its published trading hours. Read it before placing an order or when trades stop arriving.

GET/api/external/prediction/prediction-venue-schedule

Get a free API key Try it in the API reference

What it returns

One row per prediction venue: exchangeOpen, whether the venue reports its exchange as active, tradingOpen, whether it reports trading as active, and schedule, its published trading hours as free text. There is no calendar of future maintenance windows; a venue that is down shows only through its flags, while it is down. observed says how the status was obtained: true when it was read from the venue, false when it is a fixed declaration that does not follow a live outage. activeMarkets and lastIndexedAt are published only for an observed venue. asOf is when the whole answer was last indexed, and stale is true when that index is behind. 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-venue-schedule"

Response fields

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

Response fields of Is each prediction venue open and trading right now?
Field	Type	Description
`venues`	object[]	One row per venue. The set is open: a new venue appears as a new row.
`venues[].venue`	string	The venue, lowercase, e.g. `kalshi` or `polymarket`.
`venues[].exchangeOpen`	boolean	Whether the venue reports its exchange as active.
`venues[].tradingOpen`	boolean	Whether the venue reports trading as active.
`venues[].schedule`	string \| null	The venue's trading hours as published, free text, e.g. "24/7 continuous matching".
`venues[].observed`	boolean \| null	True when the status was read from the venue; false when it is a fixed declaration that does not follow a live outage; null when unknown.
`venues[].activeMarkets`	integer \| null	Markets currently open on the venue. Null when the venue is not observed.
`venues[].lastIndexedAt`	string \| null	When the venue was last read, ISO 8601 UTC. Null when the venue is not observed.
`asOf`	string \| null	When the whole answer was last indexed, ISO 8601 UTC.
`stale`	boolean \| null	True when the index behind this answer is out of date; null when unknown.
`estimated`	boolean \| null	True when the answer is an estimate rather than a reading; null when unknown.

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.

Newest trades across every prediction market
A venue whose trades stop arriving may simply be closed or in maintenance.
How much is trading on prediction venues, per venue and combined?
A venue whose 24-hour volume collapses may be closed or in maintenance.
Which prediction markets, events or traders match this text?
A market that looks live may sit on a venue that is closed right now.
One prediction-market trader's newest buys and sells
What one prediction-market trader just bought and sold, fill by fill, newest first: price, shares, the outcome, and the market and event of each. Polymarket traders only.
Which prediction market is on this venue page?
Resolve a prediction market page slug (or a ticker) to the market: its venue id, title, event, outcome labels and close date. Identity only, no prices or volume.
Which prediction-market categories carry the most volume on each venue?
Per venue, each category tag with its market count and all-time volume, highest first. Volume is in the venue's own unit: contracts on kalshi, USD on polymarket.

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