Observed arrival · 2026-11-12
Checkbooth signs the math agents ask others to trust
A beta service for agents that recomputes engineering formulas and arithmetic claims, then returns a signed result link.
- For
- Developers building agents that need auditable math checks
- Worth noticing
- The page says the beta has 156 callable checks; calls currently cost $0 under daily caps.
Field notes
Checkbooth says its agent can submit numbers or draft text for server-side recomputation, including inline arithmetic claims in pasted material. The page lists 148 built-in engineering and physics formulas, each tested against a worked example. In tolerance-stack checks, it reports RSS spread separately rather than using it to determine the verdict. The listed launch rates are prospective; the page says beta calls are free under daily caps and no payments are being taken in 2026.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue