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 |
|---|---|---|---|---|
| Dant3 Discovery Agent dant3.net |
warn | 18 of 18 days | 0 of 18 days | no |
| Dating Coaches Directory datingcoaches.fyi |
fail | 10 of 10 days | 0 of 10 days | no |
| Datoka Agent datoka-agent.bhazarstudio.workers.dev |
warn | 18 of 18 days | 0 of 18 days | valid over the card as served, not the spec's form |
| DDG Agent Services agents.daedalusdevelopmentgroup.com |
warn | 16 of 16 days | 14 of 16 days | no |
| Dealwork-MegaWorkers practical-ambition-production.up.railway.app |
fail | 18 of 18 days | 0 of 18 days | invalid |
| Decimoor by CyberMax decimoor.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Decision Anchor a2a.decision-anchor.com |
fail | 18 of 18 days | 0 of 18 days | valid over the card as served, not the spec's form |
| Defigent opacus-liana-lanceted.ngrok-free.dev |
fail | 10 of 18 days | 10 of 18 days | no |
| Degenscan Intel intel.degenscan.io |
fail | 18 of 18 days | 0 of 18 days | no |
| Deltawren by CyberMax deltawren.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Delx Agent Operations Protocol api.delx.ai |
warn | 18 of 18 days | 0 of 18 days | no |
| Depmoor by CyberMax depmoor.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| DEUSPROOF deusproof.com |
warn | 18 of 18 days | 18 of 18 days | unverifiable |
| Direct Hire Agent Directory directhireagents.com |
pass | 18 of 18 days | 18 of 18 days | no |
| Dirtsmith dirtsmith-go.bfurrow26.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Dish Directory dishdirectory.com |
fail | 6 of 6 days | 0 of 6 days | no |
| DiversZ Commons diversz.lovable.app |
fail | 18 of 18 days | 0 of 18 days | no |
| DNAAI prediction ledger dnaai.xyz |
warn | 18 of 18 days | 18 of 18 days | no |
| DocuSeal www.docuseal.com |
warn | 18 of 18 days | 0 of 18 days | no |
| DomainDNA by CyberMax domaindna-api.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Donuk donuk-agent.donuk-kitap.workers.dev |
warn | 18 of 18 days | 0 of 18 days | no |
| Doulas doulas.fyi |
fail | 10 of 10 days | 0 of 10 days | no |
| Driving Schools drivingschools.fyi |
fail | 10 of 10 days | 0 of 10 days | no |
| Duami duami.ai |
warn | 1 of 1 days | 1 of 1 days | valid over the card as served, not the spec's form |
| Dutyfinch by CyberMax dutyfinch.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Dynamic Health Monitor health.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | unverifiable |
| dasha.ai dasha.ai |
fail | 16 of 16 days | 0 of 16 days | no |
| db8779d7-2f6b-4401-971d-4497f2084a3f.agents.inhotel.io db8779d7-2f6b-4401-971d-4497f2084a3f.agents.inhotel.io |
fail | 16 of 16 days | 0 of 16 days | no |
| ddq.nl ddq.nl |
fail | 16 of 16 days | 0 of 16 days | no |
| deropay.derod.org deropay.derod.org |
fail | 16 of 16 days | 0 of 16 days | no |
| dev-match.xyz dev-match.xyz |
fail | 15 of 16 days | 0 of 16 days | no |
| developers.live-direct-marketing.online developers.live-direct-marketing.online |
fail | 16 of 16 days | 0 of 16 days | no |
| dineguide.com dineguide.com |
fail | 16 of 16 days | 0 of 16 days | no |
| doc.getlago.com doc.getlago.com |
warn | 16 of 16 days | 0 of 16 days | no |
| docs.dify.ai docs.dify.ai |
warn | 16 of 16 days | 0 of 16 days | no |
| docs.unstructured.io docs.unstructured.io |
fail | 16 of 16 days | 0 of 16 days | no |
| dreaming.press dreaming.press |
fail | 16 of 16 days | 0 of 16 days | no |
| dubai-property-signal.airblock2026.workers.dev dubai-property-signal.airblock2026.workers.dev |
fail | 16 of 16 days | 0 of 16 days | no |
| dwelldata.io dwelldata.io |
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.