Agent observatory
StillOpen checks every A2A agent it knows of once a day: does its Agent Card answer, does its endpoint report an unknown task correctly, is the card signed. Everything below is observed by StillOpen; nothing is reported by the agents' operators.
893 agents watched · 820 answered at the last check · 91 passed the endpoint probe · 61 sign their card. All three counts are out of every agent watched: an agent that did not answer cannot pass the probe and is counted as not passing it. Day counts cover the last 30 days, or since we started watching an agent if that is shorter.
| Agent | Last check | Answered | Probe passed | Signed |
|---|---|---|---|---|
| Handbook QA (edition 2026-3, current) hireanagent.dev |
warn | 18 of 18 days | 0 of 18 days | no |
| HANRIA mandate check hanria.ai |
warn | 18 of 18 days | 0 of 18 days | no |
| Haulroll by CyberMax haulroll-api.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Hearlark Pro by CyberMax hearlark.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Hello World Agent hello.a2aregistry.org |
fail | 18 of 18 days | 0 of 18 days | no |
| HexNest Machine Reasoning Network hex-nest.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Hidden AI Society morris-limited-tions-reseller.trycloudflare.com |
fail | 0 of 18 days | 0 of 18 days | no |
| Hilt Pay Agent Gateway api.hilt.so |
fail | 18 of 18 days | 0 of 18 days | no |
| Hire Solidmade solidmade-a2a.solidmade.workers.dev |
fail | 13 of 13 days | 0 of 13 days | no |
| HireHeat by CyberMax hireheat-api.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Hive Civilization thehiveryiq.com |
fail | 18 of 18 days | 0 of 18 days | no |
| HIVE message relay hive-web.tail9c2892.ts.net |
fail | 13 of 13 days | 0 of 13 days | no |
| HiveBank hivebank.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| HiveClear hiveclear.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| HiveGate hivegate.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| HiveLaw hivelaw.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| HiveTrust hivetrust.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| HORIZON SHIELD KIRA hs-mcp.oga-surf-project.workers.dev |
warn | 18 of 18 days | 0 of 18 days | no |
| Horse Truth Machine Intelligence horsetruth.com.au |
fail | 18 of 18 days | 0 of 18 days | no |
| HostDeFi Token Risk API hostdefi.com |
fail | 18 of 18 days | 0 of 18 days | no |
| houseme.ai houseme.ai |
fail | 16 of 16 days | 0 of 16 days | no |
| hrops-ai-platform.io hrops-ai-platform.io |
fail | 16 of 16 days | 0 of 16 days | no |
| Human Agent Connect human-agent-connect.vercel.app |
warn | 18 of 18 days | 0 of 18 days | no |
| Human Browser agent.humanbrowser.cloud |
fail | 0 of 18 days | 0 of 18 days | no |
| HumanMirror Discovery Agent humanmirror.fr |
fail | 18 of 18 days | 0 of 18 days | no |
Check any agent yourself with the A2A Card check; a card found there joins this list from the next daily run.