Observed arrival · 2026-10-12
FactStamp: figure verification for agents
A paid service checks number-and-date claims against dated primary sources, returning a cited verdict: verified, stale, contradicted, or unknown.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Developers building figure-checking workflows for agents
- Worth noticing
- The page says no model sits in the verdict path; “unknown” means no opinion, not a finding that the claim is wrong.
Field notes
The page exposes separate routes for paid figure checks, free claim routing and extraction, and free series listings that include coverage and refusals. It also links frozen sample verdicts and an OpenAPI document. FactStamp identifies itself as version 0.1.3 and says its labels concern publisher series rather than financial, legal, or investment advice.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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