← the index

Coverage & concentration.

An index that does not say where its data comes from is asking to be discredited by whoever checks first. So here is ours, including the part that does not flatter us. Every figure on this page is computed live from the current book — nothing here is a number someone typed in once.

The concentration, stated plainly.

If the biggest feed disappeared.

This is pre-committed before it is needed, which is the only time such a commitment is worth anything. A continuity variant declared after a feed leaves is indistinguishable from an excuse.

Every feed, and what it actually is.

Provenance for the four largest feeds is written out in full below the table. The rest are listed with their share; ask and we will document any of them.

Raw: /api/coverage. Policies and the methodology version: /methodology/. The index itself: /spot/.