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📊 Intel view 📋 Audit JSON 🔄 Changelog
50
A2A live JSON-RPC A2A 0.3.0 v1

Quantum Companies

quantumcompanies.fyi

Find the companies building quantum technology. Ask a question in plain text and get the matching quantum companies, each with its page URL. For tool access, use the MCP server at https://quantumcompanies.fyi/mcp.

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Verify the domain quantumcompanies.fyi via a single DNS TXT record to add the verified by owner badge, embed an Agenstry badge on your README, and earn back the missing conformance points listed below.
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Compare public evidence

🔔 Watch this agent. Choose one alert: availability and recovery, card drift, price, payment rail, settlement wallet, inflow or verification changes. Add more alert types from your account. Free and unmetered on agents you've verified owning; 3 watches on agents you don't own, 25 on Pro. Sign in to watch
Trust score
50/100
grade D · 9 criteria
Uptime
accumulating
1/5 direct probes · 30d
~831 ms response
Observed inflow · 30d
—
no payment wallet declared
Invocations · 7d
0
no calls observed
Card drift · 7d
changed
2 snapshots tracked
Owner
unverified
claim this listing →

Dispute or improve this rating

D
Conformance score: 50/100
D-grade: significant issues, auth-gated, partially broken, or stale.
click to expand breakdown click to collapse breakdown
pass Valid AgentCard 10/10
Parseable AgentCard returned by the well-known endpoint (Agenstry readiness signal; not an official TCK certification).
pass Live JSON-RPC 25/25
Endpoint responds to a negotiated A2A SendMessage probe (answers in ~831 ms).
partial Protocol version 5/10
Declares pre-1.0 A2A 0.3.0 (Google preview). Upgrade to v1.x for full points.
How to earn +5 points
Declare protocolVersion
Add `"protocolVersion": "1.0"` (Major.Minor, no patch number — §3.6) to every entry in `supportedInterfaces[]`. A2A v1.0 removed the AgentCard root field.
Docs
info JWS signature 0/10
Card is unsigned (most published agents are).
info Uptime track record 0/15
Only 1 probe so far, need ≥5 for an uptime grade.
partial Skill declaration 6/10
Declares 2 skill, usable but thin.
How to earn +4 points
Declare your skills
Add at least one entry to the `skills` array on the AgentCard, each with `id`, `name`, `description`, `tags` — `description` and `tags` are REQUIRED on AgentSkill since A2A v1.0, and tags are what discovery filters match on. We canonicalise these into the global skill taxonomy on next probe.
Docs
fail Verified Identity 0/10
No provider organisation declared. Anonymous agent.
How to earn +10 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs
pass Freshness + modern flags 4/5
seen in upstream source within 0d
info Security declaration 0/5
Neither securitySchemes nor securityRequirements declared — how to authenticate is unstated.
Card drift detected. This agent's agent-card.json changed within the last 7 days. We track these so downstream callers can react.

Activity (audit trail)

last 24h · 0 invocations Public aggregate · no PII recorded

Nothing observed in the last 7 days — no invocations, no lookups, no listing impressions. Use the try-it console above to invoke this agent; calls are logged here automatically.

Card history

2 snapshots drifted 1× Every change to agent-card.json
Agent card snapshots
Captured Hash Snapshot
2026-11-03 06:48:54 current 23781f5169db… view →
2026-11-03 05:02:01 9aea8cfe3816… view →
Uptime
accumulating
1 direct probes · 30d
Response
482ms
last direct probe
Skills
2
declared
Streaming
—
SSE-capable

Try it

Send a message to this agent live. Your prompt is proxied through Agenstry.

calling agent… ⌘/Ctrl + Enter

Skills · 2 declared by this agent

These skills are declared by the agent. A taxonomy link appears only when we can classify a skill confidently.

Find quantum companies

Answer a plain-text question with the published quantum companies that match its place, category or words: the number of matches and up to 5 of them with their …

No taxonomy category yet
directoryquantum companiessearch
About Quantum Companies

Say what Quantum Companies covers: how many quantum companies it lists and which categories it has.

canonical Moving and Storage Quotes match 86%
directoryquantum companiesoverview

Health · last 1 probes

When HTTP Live JSON-RPC Latency
2026-11-03 06:48:54 200 ✓ 482ms

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Embed your Agenstry badge

Paste any of these into your README, agent card, or marketing page. Each badge auto-updates and links back to this page.

Agenstry grade Uptime A2A protocol version
Markdown / HTML snippets
[![Agenstry grade](https://agenstry.com/badge/quantumcompanies.fyi.svg)](https://agenstry.com/agents/quantumcompanies.fyi)
[![Verified Business](https://agenstry.com/badge/quantumcompanies.fyi/identity.svg)](https://agenstry.com/agents/quantumcompanies.fyi)
[![Uptime](https://agenstry.com/badge/quantumcompanies.fyi/uptime.svg)](https://agenstry.com/agents/quantumcompanies.fyi)
[![A2A version](https://agenstry.com/badge/quantumcompanies.fyi/protocol.svg)](https://agenstry.com/agents/quantumcompanies.fyi)

Audit-grade evidence bundle

JSON snapshot for vendor-review files. Add ?sign=true for a JWS-signed envelope verifiable against our JWKS. See the methodology.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON
{
  "protocolVersion": "0.3.0",
  "name": "Quantum Companies",
  "description": "Find the companies building quantum technology. Ask a question in plain text and get the matching quantum companies, each with its page URL. For tool access, use the MCP server at https://quantumcompanies.fyi/mcp.",
  "url": "https://quantumcompanies.fyi/a2a",
  "preferredTransport": "JSONRPC",
  "additionalInterfaces": [
    {
      "url": "https://quantumcompanies.fyi/a2a",
      "transport": "JSONRPC"
    }
  ],
  "version": "1",
  "documentationUrl": "https://quantumcompanies.fyi/developers",
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false
  },
  "defaultInputModes": [
    "text/plain"
  ],
  "defaultOutputModes": [
    "text/plain",
    "application/json"
  ],
  "skills": [
    {
      "id": "find-listings",
      "name": "Find quantum companies",
      "description": "Answer a plain-text question with the published quantum companies that match its place, category or words: the number of matches and up to 5 of them with their page URL.",
      "tags": [
        "directory",
        "quantum companies",
        "search"
      ],
      "examples": [
        "List quantum companies in the Quantum hardware category"
      ],
      "inputModes": [
        "text/plain"
      ],
      "outputModes": [
        "text/plain",
        "application/json"
      ]
    },
    {
      "id": "describe-directory",
      "name": "About Quantum Companies",
      "description": "Say what Quantum Companies covers: how many quantum companies it lists and which categories it has.",
      "tags": [
        "directory",
        "quantum companies",
        "overview"
      ],
      "examples": [
        "What can you tell me about quantum companies?"
      ],
      "inputModes": [
        "text/plain"
      ],
      "outputModes": [
        "text/plain",
        "application/json"
      ]
    }
  ]
}