How prediction markets work, how a call is scored, and what a public record proves.
There are six practical ways to timestamp a prediction: a screenshot, a public post, a published hash you reveal later, an OpenTimestamps proof anchored to Bitcoin, an on chain transaction, or a scored forecasting platform. They differ on one axis that matters more than cost or difficulty: whether the proof survives you wanting it gone, and whether it shows the predictions you would rather forget.
7 min read
No, and the reason is in the statutes. Gambling law almost everywhere is built from three elements: a stake, an outcome that turns on chance, and a prize. Take away the stake and the definition is not met, so the licensing regime never engages. The UK, Germany, France, Spain, Italy and Brazil each write the money element into their own text, in their own words, and each one is quoted below.
8 min read
Kalshi is a CFTC regulated US exchange where you trade event contracts with dollars. Polymarket is a crypto exchange, mostly offshore, blocked by order in a growing list of countries. Metaculus is a no money forecasting platform scored on accuracy. insiderz is a no money platform where your call is scored against the live Polymarket price. Money, regulator and what the ranking measures are the three real differences.
8 min read
On the 2024 US presidential race the market leaned toward the eventual winner and the leading poll model did not. Polymarket had Trump at 58 percent on 4 November 2024, while the 538 model's final forecast gave Harris 50 in 100 and Trump 49 in 100. Pundits produced no scoreable number at all. One election does not settle the general question, and the same market data set looks much worse when you widen the sample.
6 min read
Money does not appear to buy accuracy. The head to head test that settled the question ran a real money exchange against a play money exchange across 208 NFL games in 2003 and found no statistically significant difference on four separate scoring rules. Cross platform Brier scores measured to October 2025 put the money and no money platforms in the same band. What money reliably buys is attention, liquidity and a way for large holders to push a price.
6 min read
Polymarket's leaderboard ranks realized profit and trading volume, and nothing else. Its public API accepts exactly two ordering criteria, PNL and VOL, and the response carries no accuracy field, no hit rate and no count of resolved markets. That makes it an accurate answer to "who made the most money here" and a poor answer to "who knows what is going to happen".
8 min read
Polymarket runs three public HTTP APIs. Gamma at gamma-api.polymarket.com lists events and markets. CLOB at clob.polymarket.com serves order books, prices and price history. Data at data-api.polymarket.com serves trades and positions. Every read endpoint on all three works without authentication. Only trading needs credentials and a funded wallet.
7 min read
Polymarket is blocked in Brazil. Resolução CMN 5.298, published by the Banco Central do Brasil on 24 April 2026 and in force since 4 May 2026, forbids offering or trading in Brazil any derivative whose underlying is a sports event, an online game event, or a political, electoral, social, cultural or entertainment event. Article 4 extends the ban to derivatives traded abroad but offered inside Brazil.
6 min read
As of September 2026, Polymarket is blocked or barred by order in Italy, France, Spain, Portugal, Hungary, Belgium, the Netherlands, Brazil, India, Indonesia and Australia, and it is closed to Ontario residents under a 2025 securities settlement. Almost every order came from a gambling regulator, not a crypto regulator. The reasoning repeats: an event contract is a bet on an uncertain outcome, so it needs a domestic licence.
8 min read
Polymarket is blocked in France by order of the Autorité nationale des jeux. On 16 July 2026 the ANJ president ordered French internet service providers to cut access to polymarket.com, because the site promotes an unauthorized gambling offer. Belgium got there first: the Belgian Gaming Commission put polymarket.com on its blocked list with a decision dated 30 January 2025. Forecasting the same events without a stake is a separate activity in both countries.
7 min read
Polymarket is blocked in Italy. The Agenzia delle Dogane e dei Monopoli (ADM), the customs and monopolies agency that licenses gambling, put polymarket.com back on the list of sites Italian access providers must make unreachable on 10 July 2026, with compliance due by 27 July 2026. ADM treats event contracts as betting offered without an Italian licence. Users now land on an ADM page instead of the site.
6 min read
Polymarket is blocked in Spain. On 26 May 2026 the Dirección General de Ordenación del Juego (DGOJ), the state gambling regulator, opened a sanctioning case against Polymarket and Kalshi for operating without a Spanish licence, and the Ministry of Social Rights, Consumer Affairs and 2030 Agenda ordered access providers to block both sites as a precautionary measure until the case is decided. Spain treats a bet on an uncertain future outcome as gambling, whatever the technology.
8 min read
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