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 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
query_api“connect to the MCP server at https://docs.useroot.com/_mcp/server”https://docs.useroot.com/_mcp/server
Context
199 sites in the index share the category payments api, of which 66 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: 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
TWZRD Agent IntelligenceTWZRD provides a pre-spend trust gate and receipt layer for x402 payments primarily settle
payments api Nium BrasilNium Brasil provides real-time payment solutions and API integration for businesses in Bra
payments api NiumNium provides a real-time global payments platform enabling businesses to send, receive, a
payments api Alignet Integration DocsDocumentation for Pay-me payment gateway powered by Alignet technology, offering direct ac
payments api IntroductionSpade provides an API that enriches transaction data from cards, transfers, and third-part
payments api Laso Finance APILaso Finance provides a payment API for AI agents to spend cryptocurrency on prepaid cards
payments api api-docs.solidgate.comAPI documentation for Solidgate payment platform covering authentication, signature creati
payments api NeetoInvoice DocsNeetoInvoice API documentation provides RESTful endpoints with JSON responses requiring au
payments api Record generated from a live database query. Method: about the index.