Most-traded open markets that charged takers nothing: 309 of 1,000

A standard-library Python script reads one Polymarket market, the order book for one outcome and the fee that market charges, in three public requests with no key. Read this way, 309 of the 1,000 most-traded open markets charged takers nothing on 20 September 2026. Three requests return one market's identity and outcome prices, the full order book for one outcome and the fee that market charges a taker, with no API key and no account. The full table is on the Polymarket fee calculator.

- Sports markets at a 0.03 rate, not the published 0.05: 65
- Public requests for one saved snapshot: 3

Observed 2026-09-20.

Study: https://vultax.com/research/polymarket-api-python-tutorial
Markdown: https://vultax.com/research/polymarket-api-python-tutorial.md
Data: https://vultax.com/research/polymarket-api-python-tutorial/data.json
Share card: https://vultax.com/og/article/research/polymarket-api-python-tutorial
Live screen: https://app.vultax.com/analytics/markets

Vultax Research, Polymarket API in Python: 3 Requests, No API Key Needed, 2026-09-22, https://vultax.com/research/polymarket-api-python-tutorial