Price changes
Vendors delete old prices when they publish new ones, so historical rates cannot be recovered after the fact — only accumulated. This is the log, from the month we started keeping it.
Nothing has moved yet.
Tracking began May 2026, with 196 baseline observations across 99 services and models. Every one of those is a starting value, not a change — this page fills in from the first refresh where a vendor moves a published rate.
In the meantime the current prices are all here, each stamped with the month it was checked.
How this works
Every priced field in the dataset is snapshotted whenever it is rechecked. If the value differs from the last recorded observation, the new one is appended to an append-only log with the month the vendor's page showed it.
Nothing in that log is ever edited or deleted. A correction is recorded as a further observation rather than a rewrite, which means the file's own version history is the audit trail — an entry claiming a price changed has been in the repository since the change was noticed.