Data sources
Every dataset the site reads from, how many observations it has delivered and when it last delivered one. This is the operational view: the question it answers is whether a feed is still alive.
For the legal view, who owns each dataset, what licence it arrives under and what that licence obliges us to do, see attribution and licences. The attribution text below is reproduced verbatim there and here, exactly as the publisher words it.
The licence column says which namespace a feed is loaded into. Share-alike sources, principally ODbL, are kept separate and never merged into the core corpus, and statistics on the rest of the site are computed from the core corpus only. Why that has to be so is set out on attribution and licences.
Every price carries the id of the source it came from, on the individual observation and not just on the batch that loaded it. That is what makes removal tractable: if a publisher withdraws permission, their rows can be excised and every aggregate recomputed from what remains, without rebuilding the database and without leaving orphaned figures that no longer have anything behind them.
Registered sources
3 sources · 0 share-alike| Source | Licence | Observations | Last observation |
|---|---|---|---|
MITcore corpus | 1,561,981 | 28 Jul 2026Stale · 28 Jul 2026 | |
Licence Ouverte 2.0core corpus | 33,121 | 29 Jul 2026Stale · 29 Jul 2026 | |
Contributor licencecore corpus | 4 | 29 Jul 2026Stale · 29 Jul 2026 |
A dead feed is marked, not hidden
Each source is expected to deliver once a day. When a payload arrives unchanged, or stops arriving, for several days, the source is marked aging and then stale on this page and on every price that came from it.
It is not quietly carried forward as though it were current. An upstream feed that has gone dark is a fact about the data, and the reader is the one who should decide what a four-day-old pump price is worth.
What is counted here
1,595,106 observations across 9,673 located places. Every one of them is attributable to a row in the table above.
Categories with no registered source have no prices, and they are shown empty rather than filled with an estimate. The site would rather be visibly incomplete than quietly invented.