Observed arrival · 2026-09-06
Handsigned: Human Verification as an API
A machine-readable service that lets AI agents commission bounded tasks from a named human reviewer and receive signed receipts.
Field notes
The service exposes five POST endpoints for human intervention, including local address checks, phone calls, one-question answers, irreversible-action countersigns, and advertising-copy review. Requests return a task ID, due time, polling URL, and optional callback path; completed work includes a result and an ed25519-signed receipt. Pricing and timing are explicit: address checks cost $175 within a three-mile Sacramento radius, while the reviewer examines the queue at 6 PM Pacific.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue