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Resources

Sources, methods and how to report a mistake.

This page lists every outside source the site relies on and explains how we label status, handle data and correct errors. It also offers the two 369X documents as PDFs, indexes every page on the site and lists the official 369X links.

Documents

Two PDFs set out 369X in full. View them in your browser or download a copy.

External sources

Competitor and industry facts come from these pages. 369X’s own design is described directly, with a status label on each feature.

  1. Polymarket: Trading fees (documentation) (opens in a new tab)Used for: Taker-fee formula, category rates, zero maker fees, $1.75 on 100 crypto shares at 50¢.
  2. Polymarket: Maker Rebates Program (Help Center) (opens in a new tab)Page dated 21 July 2026. Used for: Rebates funded from taker fees, 20–25% by category.
  3. Polymarket: How are markets created? (Help Center) (opens in a new tab)Page dated 19 April 2026. Used for: Markets created by the markets team; users can suggest ideas; no suggester compensation described.
  4. Polymarket: Geographic restrictions (Help Center) (opens in a new tab)Page dated 14 August 2026. Used for: 39 fully restricted countries including the United States; four close-only jurisdictions.
  5. Polymarket: Perps overview (documentation) (opens in a new tab)Used for: Perpetuals track an index, commodity, crypto asset or equity, not a prediction outcome.
  6. Bitcoin Magazine: Polymarket rolls out US app (opens in a new tab)Used for: Existence of a separate, CFTC-regulated Polymarket US venue with KYC.
  7. Kalshi: Fee schedule (effective 7 July 2026) (opens in a new tab)Page dated 7 July 2026. Used for: General taker fee: round up 0.07 × C × P × (1 − P). The PDF could not be loaded at check time; the formula was confirmed via the Kalshi Help Center fee article and secondary reporting..
  8. Kalshi: Fees (Help Center) (opens in a new tab)Used for: Taker and maker fees; maker fees lower than taker fees; no settlement fee.
  9. Kalshi: Can I trade on Kalshi from outside the United States? (Help Center) (opens in a new tab)Page dated 20 March 2026. Used for: International trading in many countries; identity verification at signup; country restrictions.
  10. Kalshi: Suggesting a new market (Help Center) (opens in a new tab)Used for: Users submit ideas to an ideas feed; the markets team reviews; no suggester compensation described.
  11. Pew Research Center: Prediction markets’ trading volume doubled between May and July, largely driven by sports (opens in a new tab)Page dated 23 September 2026. Used for: Monthly combined Kalshi + Polymarket notional taker volume, July 2024 to July 2026 (data from The Block).

How this site is written

Status labels
Every feature carries one: testnet launch, planned for mainnet, rolling out, at token launch, intended design, proposed or vision. Nothing is called live without evidence.
Illustrations
Hypothetical markets, calculators and worked examples are labelled. They never show live prices.
Numbers
Fees, token figures and limits are generated from one set of data files, so a change appears everywhere at once.
Comparisons
Competitor cells cite the venue’s own pages. Missing information is “not documented in the sources checked”. Competitor information as of September 2026. Fees and rules change; see the linked official pages.
Industry data
Historical series are shown as published, with the source and what they measure.

Corrections

Spotted an error? Tell us on Telegram (opens in a new tab) or X (opens in a new tab) with the page address and your source.

Every page on this site