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GET
Venue volume and 24h market share
1 credit per request

  • Each venue’s lifetime and 24h volume and market count, with its coverage stated (complete or partial, explained in coverageNote).
  • Kalshi’s totals cover every open Kalshi market, summed hourly from its catalog, not only the markets this API lists.
  • Each venue’s share of the 24h volume (marketShare24hr), computed only across venues with complete coverage; null otherwise, with marketShareBlockedBy saying why.
  • Choose the venues with view: intl (default) Polymarket and Kalshi, us Polymarket US and Kalshi, all every venue.
  • With include=categories, the 24h volume of Polymarket’s busiest open events in each category.

Authorizations

X-API-KEY
string
header
required

API key required to access the endpoints. Generate one from your dashboard at https://openapi.coinstats.app and pass it in the X-API-KEY request header. Never expose your key in client-side code.

Query Parameters

view
enum<string>
default:intl

Which venues get a row: intl (default) Polymarket and Kalshi, as before Polymarket US was added; us Polymarket US and Kalshi; all every venue. marketShare24hr counts only the venues with complete coverage, so under us (Polymarket US is partial) it is null.

Available options:
intl,
us,
all
include
enum<string>

categories: also categories[], per category Polymarket's categoriesTop (24) busiest open events counted and their 24h volume summed: the head of each category, not all of it.

Available options:
categories

Response

success
boolean
required

Whether the request succeeded

Example:

true

timestamp
string
required

ISO 8601 timestamp the response was generated

Example:

"2025-06-19T12:00:00.000Z"

data
object
required