PMIndex

Cross-venue prediction market pulse

Side-by-side view of aggregate public metrics from Kalshi and Polymarket—the kind of comparison neither venue highlights for the other.

Snapshot: · Collector sync: Page cache up to ~5 min; use Refresh for immediate re-read from Neon.

Latest snapshot — 24h volume

Kalshi reports contracts traded. Polymarket (Gamma) reports ~ USD / USDC-style volume. They are not the same unit—never read them as one chart of dollars.

Kalshi

64,368,994contracts traded (24h Σ in snapshot)

All-time Σ (snapshot)
866,192,705 contracts
Compact
64.37M (24h)

Polymarket

1,356,318,648~USD / USDC-style 24h volume (Gamma API)

All-time Σ (snapshot)
12,942,389,260 (~USD)
Compact
1.36B (24h)

Bar width is decorative (full width each). Do not compare Kalshi contract counts to Polymarket dollar volumes—the APIs measure different things.

Top markets (snapshot)

Top 8 by 24h volume per venue — see full list.

Kalshi

  1. 1
    Los Angeles L / Los Angeles L
    KXNBAGAME-26APR05LALDAL
    5.73M
  2. 2
    UConn / UConn
    KXMARMAD-26
    4.34M
  3. 3
    Michigan / Michigan
    KXMARMAD-26
    4.29M
  4. 4
    Dallas / Dallas
    KXNBAGAME-26APR05LALDAL
    4M
  5. 5
    Yes / Yes
    KXLAYOFFSYINFO-26
    2.01M
  6. 6
    Tulsa / Tulsa
    KXNCAAMBNIT-26
    1.88M
  7. 7
    Auburn / Auburn
    KXNCAAMBNIT-26
    1.87M
  8. 8
    Detroit / Detroit
    KXMLBGAME-26APR051920STLDET
    1.69M

Category activity (preview)

Independent top ranks per venue (not row-aligned). Full view on Heat map.

Kalshi — top groups

Ranked by 24h volume sum per group key (event/series from collector). Values are contract activity, not USD.

  • 1

    KXNBAGAME-26APR05LALDAL

    9.73M
  • 2

    KXMARMAD-26

    8.63M
  • 3

    KXPGATOUR-MAST26

    6.12M
  • 4

    KXNCAAMBNIT-26

    3.75M
  • 5

    KXMLBGAME-26APR051920STLDET

    3.02M
  • 6

    KXLAYOFFSYINFO-26

    2.01M

Polymarket — top tags

Ranked by 24h volume sum per tag/category from Gamma. Values are API-reported ~USD style.

  • 1

    trump

    397.23M
  • 2

    world-elections

    209.66M
  • 3

    sports

    204.18M
  • 4

    politics

    163.16M
  • 5

    soccer

    99.2M
  • 6

    elections

    35.27M

Recent collector snapshots

Each point is one ingest cycle. Lines use one axis but different units—shape only.

One Y-axis, two different units — lines show each venue’s own scale over time, not comparable magnitude.