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 |
|---|---|---|---|---|
| salesops-agent.dev salesops-agent.dev |
fail | 16 of 16 days | 0 of 16 days | no |
| sharksapi.ai sharksapi.ai |
fail | 16 of 16 days | 0 of 16 days | valid |
| signalsfeed.com signalsfeed.com |
fail | 16 of 16 days | 0 of 16 days | no |
| similarity-search-api-production.up.railway.app similarity-search-api-production.up.railway.app |
fail | 13 of 16 days | 0 of 16 days | no |
| sipi.bot sipi.bot |
fail | 16 of 16 days | 0 of 16 days | no |
| sm-amp-cpg.org sm-amp-cpg.org |
fail | 15 of 16 days | 0 of 16 days | no |
| solidnumber.com solidnumber.com |
fail | 16 of 16 days | 0 of 16 days | no |
| sourvillo.ru sourvillo.ru |
fail | 16 of 16 days | 0 of 16 days | no |
| speaksafely.com speaksafely.com |
fail | 16 of 16 days | 0 of 16 days | no |
| steadywrk.app steadywrk.app |
warn | 16 of 16 days | 0 of 16 days | no |
| stock-signal-kr.airblock2026.workers.dev stock-signal-kr.airblock2026.workers.dev |
fail | 16 of 16 days | 0 of 16 days | no |
| superoptix.ai superoptix.ai |
warn | 16 of 16 days | 0 of 16 days | no |
| Sanctum Beacon sanctum-beacon.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| ScalpStream Research feed.scalpstream.com |
fail | 8 of 18 days | 0 of 18 days | no |
| Scanmoor by CyberMax scanmoor.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| scramble scramble.wibandwob.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Screwtape.ai screwtape.ai |
fail | 9 of 9 days | 0 of 9 days | no |
| SCRIPTMASTERLABS — SqueezeOS Trust Router www.scriptmasterlabs.com |
warn | 18 of 18 days | 18 of 18 days | no |
| Scro Orphan Desk dualregistry.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Scro Orphan Desk orphan-desk-echo.vercel.app |
fail | 18 of 18 days | 0 of 18 days | no |
| Scry Wallet Intelligence scry.solanahub.de |
fail | 18 of 18 days | 0 of 18 days | no |
| SCVD Evidence Agent scvd.store |
fail | 18 of 18 days | 0 of 18 days | no |
| SEC Filing Proof sec-filing-proof.mattskowronis.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Secured LangChain OpenAI Agent bcrypt-langchain-core-mcp-25b8f1.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| SendSets Outbound Agent api.sendsetsapi.com |
pass | 18 of 18 days | 0 of 18 days | no |
| ShadowGraph Market Intelligence shadowgraph-live.floot.app |
warn | 18 of 18 days | 0 of 18 days | no |
| ShardLink Control Plane app.clawspan.cloud |
fail | 18 of 18 days | 0 of 18 days | no |
| Shiftmoor by CyberMax shiftmoor.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| SHIP letsship.ai |
warn | 18 of 18 days | 0 of 18 days | no |
| SI Federation si-federation-a2a.onrender.com |
warn | 18 of 18 days | 0 of 18 days | no |
| Sidequest Commons Guide agents.kimetsu.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| SignalMend signalmend-repair.pages.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| SINCOR Agent Swarm getsincor.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Skowron Compliance Gateway skowron-compliance-gateway.mattskowronis.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| SKYROS Economic Agent Platform vlgibwclecuhnnrgycnx.supabase.co |
fail | 17 of 18 days | 17 of 18 days | no |
| SleepStudies sleepstudies.fyi |
fail | 3 of 3 days | 0 of 3 days | no |
| Slickrock.dev www.slickrock.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Smalltalk Experimental Agent 18.222.26.118:47831 |
fail | 0 of 18 days | 0 of 18 days | no |
| SMKlog Parcel Quotes www.smklog.com |
warn | 18 of 18 days | 0 of 18 days | valid over the card as served, not the spec's form |
| Sober Bars soberbars.fyi |
fail | 10 of 10 days | 0 of 10 days | no |
| Social network for AI agents socialnetworkforaiagents.com |
pass | 16 of 16 days | 16 of 16 days | no |
| Solvatron Intelligence solvatron77.pythonanywhere.com |
fail | 0 of 18 days | 0 of 18 days | no |
| Solvela api.solvela.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Source Checker sources.hireanagent.dev |
warn | 18 of 18 days | 0 of 18 days | no |
| Source Claim Proof source-claim-proof.mattskowronis.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| SpecStream api.specstream.ai |
warn | 16 of 16 days | 16 of 16 days | valid over the card as served, not the spec's form |
| SSSNACK Takeover Arena sssnack.com |
warn | 18 of 18 days | 0 of 18 days | valid |
| Star Guard localhost-0.tail351ad9.ts.net |
fail | 10 of 18 days | 0 of 18 days | no |
| Staylocoworks Compliance Operations staylocoworks-agent-commerce.vercel.app |
fail | 18 of 18 days | 0 of 18 days | no |
| StillOpen stillopen.work |
pass | 17 of 17 days | 17 of 17 days | valid |
| Strasmore US market data ai.strasmore.com |
warn | 18 of 18 days | 18 of 18 days | no |
| Structured Output Agent structured-output-agent-c2ddcc.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output Agent structured-output-agent-openai.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output MCP Agent structured-output-agent.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output MCP Agent (Authlib) structured-output-mcp-agent-authlib.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output MCP Agent (Cryptography) structured-output-mcp-agent-cryptography.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output MCP Agent (Instructor) structured-output-mcp-agent-instructor.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output MCP Agent (Langchain Core) structured-output-mcp-agent-langchain-core.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Structured Output MCP Traced Agent structured-output-mcp-traced-agent.getvda.ai |
fail | 18 of 18 days | 0 of 18 days | no |
| Studiofinder studiofinder.fyi |
fail | 5 of 5 days | 0 of 5 days | no |
| Sumbloom by CyberMax sumbloom.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Sunny Yuen agent.yuens.me |
fail | 18 of 18 days | 0 of 18 days | no |
| Sunward Proof Receipt sunward-proof-receipts.aadoc.chatgpt.site |
fail | 18 of 18 days | 0 of 18 days | no |
| SursaTech AI Advisor www.sursatech.com |
warn | 18 of 18 days | 0 of 18 days | no |
| Swarm Foundry Preflight a2aregistry.org |
fail | 18 of 18 days | 0 of 18 days | no |
| Swarm Foundry Preflight swarm-foundry.noble-pine-2603.chatgpt.site |
fail | 18 of 18 days | 0 of 18 days | no |
| SwarmMemo swarmmemo.com |
fail | 14 of 14 days | 0 of 14 days | valid |
| Swarmnest swarmnest.ai |
fail | 2 of 2 days | 2 of 2 days | no |
| Swarmonic swarmonic.ai |
fail | 13 of 18 days | 13 of 18 days | no |
| SwarmSync Commerce Demo Agent swarmsync-agents.onrender.com |
fail | 18 of 18 days | 0 of 18 days | no |
| Swellmeter Trending by CyberMax swellmeter-api.cybermax-tools.workers.dev |
fail | 18 of 18 days | 0 of 18 days | no |
| Synap by Linkrra pool.linkrra.com |
warn | 18 of 18 days | 0 of 18 days | no |
| SYNTHORA Open Interest Oracle openinterest.hergertsynthora.com |
fail | 14 of 18 days | 0 of 18 days | no |
| SYNTHORA regwatch regwatch.hergertsynthora.com |
fail | 14 of 18 days | 0 of 18 days | no |
| SYNTHORA — M2M Intelligence Mesh api.hergertsynthora.com |
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.