# City and station coverage

The primary research cohort contains Miami (KMIA), Austin (KAUS), Los Angeles (KLAX), San Francisco (KSFO), Seattle (KSEA), Seoul (RKSI/Incheon) and London (EGLC/London City). Madrid (LEMD) was a reserve, outside the primary cohort. The five US cities are cross-venue candidates; station identity alone does not establish equivalent settlement.

The local August 1–4 weather/book diagnostic covers the five US cities and London. Seoul has provider metadata/history coverage, but no matching August local weather/book overlap in that diagnostic. Neither Seoul nor London enters the US cross-venue payout samples.

The inspected native Kalshi London contracts name EGLL/Heathrow, while the project and retrieved Polymarket rules use EGLC/London City. The shared city label is insufficient for a hedge. The bounded checked Kalshi London event had zero reported volume/empty results and returned 404 through Assymetrix; these observations establish neither a verified traded hedge nor permanent absence of international listings.

See the [retained panel and sample denominators](../evidence/research-summary.json). The complete source cohort document retains the dated catalog probes and station pins; this condensed note preserves the station distinction used by the article.

Source method: docs/ASSYMETRIX-COHORT.md. Original SHA256: `a57a708dc06df2a6c5ea97492446f1861b04012a24efdf35457b26f48fa0bde5`. This portable note is an explicit condensed editorial derivative, not the complete internal method document.