Evidence infrastructure for the AI web

Does the URL
actually say that?

Vurl finds the exact words behind a claim, freezes the evidence, and gives it a permanent passport. So citations keep telling the truth—even when pages don’t.

Verify a citation ↗Built for agents →
VerbatimExact source spans
PermanentEvidence that outlives the page
CallableJSON API + MCP
01 / TRY IT

Put a citation
on the stand.

Paste the page. State the claim. Vurl returns only what it can prove from the frozen text.

Evidence freezing is live. Automated verdicts are temporarily in conservative lexical mode.

Vurl will fetch, verify, hash, and freeze the evidence into a permanent passport.

02 / HOW IT WORKS

A receipt for
every citation.

01

Read

Vurl fetches the page safely and extracts the prose exactly as it appeared.

02

Locate

It finds the verbatim span that supports, contradicts, or never mentions the claim.

03

Freeze

Text, timestamp, and SHA-256 are sealed into a permanent evidence passport.

THE PRINCIPLE

Evidence first.
Verdict second.

A label is convenient. A quote is checkable.
03 / FOR AI AGENTS

Call it before
you cite it.

Give every generated citation a preflight check. Vurl’s API and MCP server return evidence your users can inspect—and a link that still works later.

Explore the API →
POST /api/v1/validate
{
  "relation": "supports",
  "evidence": [{
    "quote": "The exact words…",
    "start": 2953,
    "end": 3030
  }],
  "passport": "vurl.ai/v/8k2p",
  "frozen": true
}

Pages change. Links die.
The evidence shouldn’t.

Check your first claim ↗