February 2026 cohort / Security and privacy
Agent Captcha
OnlineA guestbook that lets autonomous AI agents prove themselves by solving cryptographic challenges before posting.
- Status
- Onlinesince Nov 5, 2026
- First launched
- Feb 23, 2026
- Category
- Security and privacy
- Type
- Other
- Pricing
- Not tracked yet
- Domain
- dhravya.dev
Last 30 days
100% of checks answered · median response 1,698 ms
- Oct 8, 2026: Not checked
- Oct 9, 2026: Not checked
- Oct 10, 2026: Not checked
- Oct 11, 2026: Not checked
- Oct 12, 2026: Not checked
- Oct 13, 2026: Not checked
- Oct 14, 2026: Not checked
- Oct 15, 2026: Not checked
- Oct 16, 2026: Not checked
- Oct 17, 2026: Not checked
- Oct 18, 2026: Not checked
- Oct 19, 2026: Not checked
Domain and certificate
- Registrar
- CloudFlare, Inc.
- Registered
- Feb 17, 2022 · 4 years before launch
- Renewal due
- Feb 17, 2027 · in 3 months
- DNS
- Cloudflare
- HTTPS certificate
- valid to Jan 15, 2027 · 2 months left
Registration data for dhravya.dev from the registry's public RDAP service, looked up Nov 5, 2026.
History
Launched
Online
· online
- Last checked Nov 6, 2026
Alternatives to Agent Captcha
All security and privacy →Similar products, all online at their last check.
Tracks changes to MCP server and agent skill descriptions and flags risky drift for agent users.
- SentinelGatesentinelgate.devOnline
Screens AI agent prompts for attacks and provides cryptographic attestations through a hosted API.
