What we tested
Probed live on 23 Aug 2026 against rubric v1. 4 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 its MCP server offers
We connected, ran tools/list, and recorded what came back on 23 Aug 2026. 3 tools — the standard set for sites on mintlify.
search_polarquery_docs_filesystem_polarsubmit_feedback
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
read“Fetch the complete documentation index at: https://polar.sh/docs/llms.txt”https://polar.sh/docs/llms.txt
Context
6 sites in the index share the category billing platform, of which 1 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?
1 check did not pass when we last looked: API catalog. 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
EasybillingEasyBilling is a global billing and payments platform designed for AI companies with flexi
billing platform FlexpriceFlexprice is an open-source platform for metering, billing, and feature management designe
billing platform OrbOrb provides a billing platform supporting usage-based, seat-based, hybrid billing, and en
billing platform Vayu docsVayu provides a billing platform with flexible pricing models and a RESTful API for event-
billing platform EnlivyEnlivy is a SaaS platform for service companies managing offers, contracts, invoicing, pay
billing platform VibeMarketologRussian AI marketing platform offering agents for advertising, analytics, and sales with 2
ai marketing platform AigonAigon provides AI agents focused on productivity, education, property, and facilities mana
ai agents platform BibiGPTBibiGPT is an AI tool that summarizes and transcribes audiovisual content from multiple pl
ai video summarization tool Record generated from a live database query. Method: about the index.