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 |
|---|---|---|---|---|
| Cape Partners — Agent Exchange www.capepartners.fr |
warn | 18 of 18 days | 18 of 18 days | invalid |
| CarGene car-gene.com |
warn | 18 of 18 days | 0 of 18 days | no |
| Catalyst Desk catalyst-desk.catalystdesk.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| ChainAware.ai API beta.backend.chainaware.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| CharitySense data.charitysense.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Checkpoint402 api.checkpoint402.com |
warn | 7 of 7 days | 7 of 7 days | no |
| chelsea-hermes fachada.chelsea-hermes.workers.dev |
fail | 12 of 18 days | 0 of 18 days | no |
| ChilledSites chilledsites.com |
fail | 18 of 18 days | 0 of 18 days | no |
| China On-Site Video Service bianhuakai.club |
fail | 18 of 18 days | 0 of 18 days | no |
| Citewren by CyberMax citewren.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Citiview Agent Market agents.citiviewgroup.com |
fail | 13 of 18 days | 13 of 18 days | no |
| CityDesk Colony citydesk-chi.vercel.app |
fail | 12 of 12 days | 0 of 12 days | no |
| Claix claix.dev |
warn | 17 of 18 days | 0 of 18 days | no |
| Claude Schema Output Agent structured-output-agent-89bcb0.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Clipwhit by CyberMax clipwhit.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Clix Agent api.clix.so |
fail | 18 of 18 days | 0 of 18 days | no |
| Co-Legal Assistant agent.co-legal.be |
warn | 18 of 18 days | 18 of 18 days | valid over the card as served, not the spec's form |
| Codex-Autonomous-Worker codex-autonomous-worker.rwdburley.chatgpt.site |
fail | 18 of 18 days | 0 of 18 days | valid |
| cogDepot api.cogdepot.com |
warn | 18 of 18 days | 18 of 18 days | valid over the card as served, not the spec's form |
| Coin Railz coinrailz.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Commerce Intelligence mcp.phoslabs.io |
fail | 18 of 18 days | 0 of 18 days | no |
| Commonkite by CyberMax commonkite.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Comrades of War Archive Research Agent comrades-of-war-router.discoglobal.workers.dev |
warn | 18 of 18 days | 0 of 18 days | no |
| CONNSKILL Growth Services agent.connskill.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Conway Replicatio conway-replicatio-cloudflare.nikitamakiel1.workers.dev |
fail | 0 of 18 days | 0 of 18 days | no |
| Cook County (Chicago) property records API api.ingest0r.com |
fail | 18 of 18 days | 0 of 18 days | no |
| corsoai10puntate canfly.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Council of AI — Measurement Agent councilof.ai |
warn | 18 of 18 days | 18 of 18 days | unverifiable |
| Cracked cracked.ai |
fail | 5 of 18 days | 0 of 18 days | no |
| Creator Desk Machine Distribution creator-desk-x402-isolated.onrender.com |
warn | 18 of 18 days | 0 of 18 days | no |
| CreditUnions creditunions.fyi |
fail | 10 of 10 days | 0 of 10 days | no |
| crosscheck crosscheckapi.com |
warn | 18 of 18 days | 18 of 18 days | no |
| crvUSD Yield Optimizer llama.box |
fail | 18 of 18 days | 0 of 18 days | no |
| CueVanta cuevanta.com |
warn | 18 of 18 days | 0 of 18 days | no |
| CurseX cursex.tech |
warn | 18 of 18 days | 0 of 18 days | no |
| cai.com cai.com |
warn | 16 of 16 days | 0 of 16 days | no |
| clawdflix.com clawdflix.com |
fail | 16 of 16 days | 0 of 16 days | no |
| clearmarket.fyi clearmarket.fyi |
warn | 16 of 16 days | 0 of 16 days | no |
| clinicalops-agent.io clinicalops-agent.io |
fail | 16 of 16 days | 0 of 16 days | no |
| cocktail.towerofrecords.com cocktail.towerofrecords.com |
fail | 16 of 16 days | 0 of 16 days | no |
| codepulse-api.hahavoid0.workers.dev codepulse-api.hahavoid0.workers.dev |
warn | 16 of 16 days | 0 of 16 days | no |
| coin-signal.airblock2026.workers.dev coin-signal.airblock2026.workers.dev |
fail | 16 of 16 days | 0 of 16 days | no |
| commerce.delx.ai commerce.delx.ai |
fail | 16 of 16 days | 0 of 16 days | no |
| composer.agenticpaywall.com composer.agenticpaywall.com |
fail | 16 of 16 days | 0 of 16 days | no |
| coordinator.agentmoney.net coordinator.agentmoney.net |
fail | 16 of 16 days | 0 of 16 days | no |
| cpater-metastate.hf.space cpater-metastate.hf.space |
fail | 16 of 16 days | 0 of 16 days | no |
Check any agent yourself with the A2A Card check; a card found there joins this list from the next daily run.