What we tested
Probed live on 23 Aug 2026 against rubric v1. 2 of 5 checks passed.
PROBE-VERIFIEDtier 2 of 3
✓Markdown negotiationAccept: text/markdown
—Markdown twin at a predictable URL/page.md
✓llms.txt/llms.txt
—API catalogRFC 9727
—MCP server answers/.well-known/mcp/server-card.json → tools/list
What an agent could do here
Read from the page’s own content, with the wording each was drawn from. Inference is kept separate from tested facts — an agent completing the action is tier 3.
UNVERIFIED
book“Purchase tickets to visit the Colosseum”https://rome-tickets.org/colosseum-tickets/
Context
10 sites in the index share the category tourist attraction tickets, of which 10 are transactional.
How we grade
Three tiers. Every listing shows which one it has reached, and when. The rubric.
tier 1Declared
The site says agents are welcome in its robots.txt. A permission, not a capability.
tier 2Probe-verified
We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
tier 3Behaviourally verified
An agent completed the action end to end — booked, bought, submitted — and it worked.
Own this site?
3 checks did not pass when we last looked: Markdown twin at a predictable URL, API catalog, MCP server answers. Each is a small, specific fix; the rubric says exactly what we look for.
Behavioural verification — an agent completing your booking, purchase or contact flow end to end, with the date published here — opens to a small founding cohort first. Leave an email to be in it.
Related verified sites
acropolis.athenstickets.orgOnline platform to buy skip-the-line tickets and guided tours for the Acropolis and relate
tourist attraction tickets athenstickets.orgSite offers information and timed-entry ticket booking for the Acropolis and six other arc
tourist attraction tickets eiffeltower.paristickets.orgThis site offers online booking for Eiffel Tower tickets including guided tours with eleva
tourist attraction tickets london-tickets.comOnline booking platform for tickets to London's top attractions, museums, river cruises, a
tourist attraction tickets paristickets.orgOnline booking platform for tickets and guided tours to major Paris attractions including
tourist attraction tickets rome-tickets.orgOffers purchase of entry tickets and guided tours for Rome attractions including the Colos
tourist attraction tickets Record generated from a live database query. Method: about the index.