Open data pipeline · EU market structure
Who is a member of which European venue — and how do we know?
Search firms, LEIs, member codes and venues across Xetra, Euronext, BME and the London Stock Exchange. Every answer traces back to a captured public source.
How an observation is made
- 01
Capture
Official venue directories are fetched and stored as immutable, hashed snapshots.
- 02
Gate
Schema checks and a >15% drop rule quarantine broken captures before they count.
- 03
Resolve
Members are matched to legal entities (LEI) by deterministic, auditable rules.
- 04
Track
Snapshots become intervals and change events; absence needs two confirmations.
Built to be trusted, not just browsed
Every claim has provenance
Each membership links to the snapshot, its SHA-256, retrieval time, parser version and identity method.
Absence is never assumed
NOT_OBSERVED is scoped to a source that was processed successfully. Failed or partial sources answer UNKNOWN.
History you can replay
Intervals and events are rebuilt deterministically from observations; identity changes never rewrite membership history.