Volume Methodology
Every volume figure on TickerTracker is face value: contracts traded, with each contract counted at its full payout, in dollars. This page sets out where each platform’s daily figure comes from and which platforms the combined total sums.
What Volume Means
A trade of 100 contracts at 63¢, each paying $1 if it wins, produces three different numbers.
| Measure | What it counts | This trade |
|---|---|---|
| Contracts traded | How many contracts changed hands | 100 |
| Volume | Every contract at its full payout, in dollars (face value) | $100 |
| Cash traded | What the buyer paid: contracts × price | $63 |
TickerTracker reports volume. It is price-independent, and it is what Kalshi and Polymarket display. Notional value is a technical synonym for face value.
When a contract pays $1, volume and contracts traded are the same number. Where a contract pays a different amount, as on some CDNA contracts, volume uses the measured payout.
Platforms at a Glance
| Platform | Source | Counted as | Combined total |
|---|---|---|---|
| Kalshi | Daily market-data export | Contracts, fractional | In combined total |
| Polymarket US | Daily market report (CSV) | Contracts, fractional | In combined total |
| Rothera | End-of-day market report (CSV) | Contracts, whole | In combined total |
| DKeX | Daily market report (CSV) | Contracts, whole | In combined total |
| Underdog Exchange | Daily market and trade data (JSON) | Contracts, fractional | In combined total |
| Novig | Daily trades and markets files (CSV) | Contracts, fractional | In combined total |
| CDNA | Daily bulletin (PDF) | Contracts × measured payout | In combined total |
| ProphetX | Daily bulletin (CSV) | Contracts × $1 | In combined total |
Kalshi
In combined totalSource
Kalshi’s published daily market-data export, one file per trading day.
Trading day
04:00 UTC to 04:00 UTC, the day covered by Kalshi’s daily export.
What counts
Every contract traded that day, including fractional contracts (Kalshi’s minimum is 0.01 of a contract). Each contract pays $1, so contracts traded and volume are the same number.
Completeness
Daily figures and totals use imported days only. The current day joins them once its export is imported.
Tracked from
June 30, 2021
Polymarket US
In combined totalSource
The daily market report CSV that Polymarket US publishes for each business date.
Trading day
The Business Date on the report.
What counts
The report’s Trade Volume for every contract, summed with fractional contracts kept.
Tracked from
October 30, 2025
Rothera
In combined totalSource
Rothera’s end-of-day market report CSV, one file per trading day, from Rothera’s public file server.
Trading day
The date of the report file.
What counts
The report’s volume for every contract, in whole contracts, each counted at $1. A settlement-weighted figure (contracts × settlement price) is stored separately; volume uses the contract count.
Tracked from
May 21, 2026
DKeX
In combined totalSource
The daily market report CSV listed in DKeX’s (Railbird Exchange) public daily-market report manifest. DKeX also publishes daily settlement and time-and-sales reports.
Trading day
The date of the report.
What counts
The report’s trade volume for every contract, in whole contracts, each counted at $1. A settlement-weighted figure (contracts × settlement price) is stored separately; volume uses the contract count.
Tracked from
June 11, 2026
Underdog Exchange
In combined totalSource
Underdog Exchange’s public daily reports: a market-data file and a trade-data file for each date, listed in a public manifest.
Trading day
The date on the report.
What counts
Contracts traded on Underdog Exchange (UDX), fractional contracts kept, each counted at $1.
Tracked from
June 24, 2026
Novig
In combined totalSource
Novig’s public data feed: a trades CSV and a markets CSV for each date, published shortly after midnight US Eastern. A day that fails Novig’s own validation is withheld from publication.
Trading day
Midnight to midnight, US Eastern.
What counts
The taker side of every trade, so each trade counts once, with fractional contracts kept and each contract counted at $1. Wash trades are excluded from Novig’s published volume.
Completeness
Novig publishes the day’s volume three ways: taker quantity in the trades file, cost across both sides of every trade, and daily volume in the markets file. A date is imported only when all three agree exactly.
Tracked from
August 4, 2026
CDNA
In combined totalSource
The daily bulletin that Crypto.com | Derivatives North America (formerly Nadex) publishes as a CFTC-required disclosure, released the next business day. Both its Summary and Detail sections are read.
Trading day
The trade date on the bulletin.
What counts
Contracts traded × payout per contract. The payout is measured from settlements, using that day’s where available and nearby days otherwise. Event contracts pay $1, financial binaries paid $10 in January 2026 and $1 by September 2026, and knock-out contracts pay other amounts.
Completeness
A day enters the totals only when a measured payout exists for every contract traded that day.
Tracked from
January 1, 2026
ProphetX
In combined totalSource
ProphetX’s publicly disclosed daily bulletin CSV, one file per date, available the following morning.
Trading day
The date on the bulletin.
What counts
The volume ProphetX reports for each contract. ProphetX publishes it as a dollar figure; every ProphetX contract pays $1, so that figure equals contracts traded at face value.
Basis
Face value, the same basis as every other platform here, and included in the combined total.
Tracked from
June 16, 2026
Combined Total
The combined prediction market volume sums Kalshi, Polymarket US, Rothera, DKeX, Underdog Exchange, Novig, CDNA and ProphetX: 8 platforms measured on the same face-value basis. Each platform contributes its own published days, and each platform’s windows (yesterday, 7 days, 30 days, year to date, all-time) end on that platform’s latest published day. A platform’s unpublished days are left out of the sum rather than counted as zero.
Polymarket joins the combined total once our on-chain volume source is live.