What we tested
Probed live on 23 Aug 2026 against rubric v1. 0 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
contact“Call Now”tel:+18329912301
request_quote“Request Service”https://plumbingchamp.com/contact-us/
request_quote“Get emergency help”https://plumbingchamp.com/emergency-plumbing/
request_quote“Clear the drain”https://plumbingchamp.com/drain-cleaning/
request_quote“Fix hot water”https://plumbingchamp.com/water-heater/
request_quote“Inspect the line”https://plumbingchamp.com/sewer-line-repair-and-replacement/
request_quote“Schedule gas help”https://plumbingchamp.com/gas-line-repair/
request_quote“Repair the line”https://plumbingchamp.com/water-line-repair-and-replacement/
Context
10 sites in the index share the category plumbing service, of which 6 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?
5 checks did not pass when we last looked: Markdown negotiation, Markdown twin at a predictable URL, llms.txt, 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
Desatascos Pociten ToledoDesatascos Pociten Toledo offers 24h urgent plumbing and drainage services including pipe
plumbing service Pocería MadsanPocería Madsan provides 24/7 plumbing services in Madrid including urgent unclogging, sept
plumbing service Papas Plumbing Inc.Papas Plumbing Inc. is a third-generation plumbing service in Los Angeles offering 24/7 em
plumbing service MAP Plumbing and RooterLicensed plumbing service in Panorama City, CA offering emergency plumbing, drain cleaning
plumbing service No Probs PlumbingEmergency plumbing services in Perth including blocked drains, pipe relining, and hot wate
plumbing service Pulliam PlumbingPulliam Plumbing provides plumbing repairs, installations, and maintenance services in Boe
plumbing service Urban Plumbing Inc.Licensed 24/7 plumbing service in Lake Zurich and Northwest Suburbs of Illinois offering d
plumbing service Coast to Coast PlumbingCoast to Coast Plumbing provides plumbing services including drain cleaning, sewer repair,
plumbing service Record generated from a live database query. Method: about the index.