2026-09-28
Two Stripe pages moved, and UCP published a new version
Stripe moved its shared payment tokens and x402 documentation to new addresses. The values we track did not change, and the links above now point where the pages live. UCP published version 2026-08-25, and it is not backward-compatible: signing_keys becomes keys, payment extensions move under dev.ucp.common.payment, and ucp.services and ucp.payment_handlers become required. The table keeps 2026-04-08, the last version a person confirmed, until one confirms the new release, and our audits keep pointing to 2026-04-08 until the new version has been tested end to end, because a profile that claims a version it does not meet is worse than an older one. One value is now marked unconfirmed: Stripe's merchant profiles preview version no longer appears on its public docs.
2026-09-02
The watch itself went in
Until now these values were pinned with a date and re-checked when somebody remembered. A weekly job now reads each source page and flags the ones that have moved. It is deliberately small: at most twelve requests a week, only the pages linked below, and it compares a fingerprint rather than copying anything. A page we cannot reach is recorded as unconfirmed, never as a change — somebody's server being down is not their specification moving.
2026-08-31
First full read of the published sources
Every value in the table below was read from its source page and dated on this day. Two things are worth stating plainly from that read. Completing a purchase inside ChatGPT is a separate programme and, on this date, open in the United States only — everywhere else, the honest outcome is being found, understood and shortlisted, which is most of the value and all of the work anyone can actually do for you. And the Stripe versions below are preview versions: they are expected to move, which is exactly why they are pinned rather than typed into a document.