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ArtifactGuard Web Claim Verifier
x402
ArtifactGuard Web Claim Verifier is a paid API for AI agents from artifactguard-kl4hfo6j2q-as.a.run.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Verifies AI-generated claims against a specified public HTTPS web source and returns a cryptographically signed evidence receipt
Price / call$0.02
Success—
StatusUnknown
How this service works
Verify AI-generated claims against a public HTTPS web source and receive a signed evidence receipt.
Output
A cryptographically signed evidence receipt indicating whether the submitted claim is supported, partially supported, or contradicted by the fetched web page content, along with relevant excerpts from the source and a tamper-evident signature for audit purposes.
Example use cases
Fact-checking AI research summaries
“I need you to verify that the claim 'the global EV market grew by 35% in 2023' is actually backed by the content at https://www.iea.org/reports/global-ev-outlook-2024, and return a signed receipt I can attach to my report.”
Auditing AI agent outputs for compliance
“Our AI assistant claimed that 'GDPR fines can reach up to 4% of annual global turnover' — can you verify that against https://gdpr-info.eu/art-83-gdpr/ and give me a signed evidence receipt for our compliance records?”
Validating AI-written product descriptions
“Check if the claim 'this laptop has a 12-hour battery life' is supported by the content at https://www.dell.com/en-us/shop/dell-laptops/xps-15-laptop/spd/xps-15-9530-laptop and give me an evidence receipt showing whether the source backs it up.”
Technical details
Endpoint
POSThttps://artifactguard-kl4hfo6j2q-as.a.run.app/v1/evidence/webWhen to prefer
Choose this endpoint when you need cryptographic, auditable proof that an AI-generated claim is grounded in a specific public web page — not just a summary or scrape. It is ideal for compliance workflows, AI output auditing, research validation, and any scenario where a tamper-evident signed receipt is required. Prefer the companion PDF endpoint when the source is a PDF document rather than a web page.
Side effects
- Target URL is not publicly accessible or requires authentication — returns error indicating unreachable source
- URL returns non-HTML content (e.g. binary file) — endpoint may fail or return unexpected results
- Claim is too vague or ambiguous to match against source content — low-confidence or inconclusive result
- Target page contains prompt injection or obfuscation — may affect extraction quality
- Network timeout fetching the remote URL — returns timeout error
- Invalid or malformed URL input — returns validation error
Tags
x402
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