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📊 Intel view 📋 Audit JSON 🔄 Changelog
100
A2A live JSON-RPC A2A 1.0 v0.4.3 x402 micropay

Agent Verification Utility

agent-economy.kgninja.dev · KG-NINJA

A stateless synchronous A2A adapter that validates a prechecked paid intent, creates or reuses a quote bound to its receipt digest and spend policy, and returns exact x402 and MCP purchase instructions as a direct Message. It does not create Tasks or execute paid work without payment.

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🔔 Watch this agent. Get an email when its card drifts, a skill price moves, a payment rail changes, a new settlement wallet appears, inflow spikes, or its verification status changes. 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
78/100
grade B · 9 criteria
Uptime
100.0%
18 direct probes · 30d
~124 ms response
Observed inflow · 30d
no payment wallet declared
Invocations · 7d
0
3 listing impressions — no calls
Card drift · 7d
changed
4 snapshots tracked
Owner
unverified
claim this listing →

Dispute or improve this rating

B
Conformance score: 78/100
B-grade: working agent with minor gaps (often unsigned cards or thin metadata).
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 ~124 ms).
pass Protocol version 10/10
Declares A2A 1.0 with supportedInterfaces[] (current v1 card shape).
info JWS signature 0/10
Card is unsigned (most published agents are).
pass Uptime track record 15/15
18/18 probes succeeded (100% uptime).
partial Skill declaration 6/10
Declares 1 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`. We canonicalise these into the global skill taxonomy on next probe.
Docs →
partial Verified Identity 5/10
Provider declared: KG-NINJA (https://agent-economy.kgninja.dev). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.
How to earn +5 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 5/5
declares 1 modern capability flag(s) (x402); seen in upstream source within 0d
partial Security declaration 2/5
Declares securityRequirements: [] — deliberately public, no credentials required.
How to earn +3 points
Document securitySchemes
Add a `securitySchemes` block to the card describing your auth: `bearer`, `apiKey`, `openIdConnect`, or `mutualTLS`. Routers refuse to call agents that declare no auth model.
Docs →
⚠ 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
0
invocations 7d
reached the endpoint through us
0
lookups 7d
our API answered about it
3
impressions 7d
appeared in a result list
Per event type (7d)
3
search_impression
Recent events (last 20)
When Event Method Status Latency
2026-08-15T03:39:12 search_impression 200 ok
2026-08-15T03:38:41 search_impression 200 ok
2026-08-14T13:41:29 search_impression 200 ok

Card history

4 snapshots drifted 3× Every change to agent-card.json
Captured Hash
2026-08-13 20:05:17 current 8365565ab2ce… view →
2026-08-13 08:07:39 534bbb1f064c… view →
2026-08-12 20:08:43 ed0a9112b1f8… view →
2026-08-11 11:13:06 c6d2ae2a6a67… view →
Uptime
100.0%
18 direct probes · 30d
Response
37ms
last direct probe
Skills
1
declared
Streaming
SSE-capable

Try it

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

calling agent…

Skills · 1 declared · mapped to canonical taxonomy

Prepare JSON evidence verification

Revalidate a bounded request, spend policy, and precheck receipt digest; create or reuse an idempotent bound quote; and return exact x402 purchase instructions.…

canonical X402 Usdc Payments match 86%
jsonverificationx402quote

Health · last 18 probes

When HTTP Live JSON-RPC Latency
2026-08-19 10:33:49 200 37ms
2026-08-18 19:57:44 200 30ms
2026-08-18 08:43:50 200 92ms
2026-08-17 23:43:51 200 29ms
2026-08-17 16:44:43 200 27ms
2026-08-17 06:17:57 200 33ms
2026-08-16 20:49:10 200 72ms
2026-08-16 07:39:02 200 57ms
2026-08-16 01:30:57 200 33ms
2026-08-15 06:07:43 200 25ms

Who's calling this agent 30d

3 interactions captured (impressions + lookups + A2A calls)

By AI host (caller_kind) · top 3
Web browser 3 (100%)
Caller geography · top 3
BG 2
US 1
Via which API surface · top 3
rest 3

Public teaser: top-3 per dimension only. Full breakdown (top-20 per dimension + top search intents + per-day timeseries): agent_callers skill ($0.05/call, $0 on Enterprise). Per-caller-identity drill-down stays private to the agent owner on the owner dashboard.

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Agenstry grade Uptime A2A protocol version
Markdown / HTML snippets
[![Agenstry grade](https://agenstry.com/badge/agent-economy.kgninja.dev.svg)](https://agenstry.com/agents/agent-economy.kgninja.dev)
[![Verified Business](https://agenstry.com/badge/agent-economy.kgninja.dev/identity.svg)](https://agenstry.com/agents/agent-economy.kgninja.dev)
[![Uptime](https://agenstry.com/badge/agent-economy.kgninja.dev/uptime.svg)](https://agenstry.com/agents/agent-economy.kgninja.dev)
[![A2A version](https://agenstry.com/badge/agent-economy.kgninja.dev/protocol.svg)](https://agenstry.com/agents/agent-economy.kgninja.dev)

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
{
  "name": "Agent Verification Utility",
  "description": "A stateless synchronous A2A adapter that validates a prechecked paid intent, creates or reuses a quote bound to its receipt digest and spend policy, and returns exact x402 and MCP purchase instructions as a direct Message. It does not create Tasks or execute paid work without payment.",
  "supportedInterfaces": [
    {
      "url": "https://agent-economy.kgninja.dev/a2a",
      "protocolBinding": "JSONRPC",
      "protocolVersion": "1.0"
    }
  ],
  "provider": {
    "organization": "KG-NINJA",
    "url": "https://agent-economy.kgninja.dev"
  },
  "version": "0.4.3",
  "documentationUrl": "https://agent-economy.kgninja.dev/docs/mcp-x402-interoperability",
  "iconUrl": "https://agent-economy.kgninja.dev/icon.svg",
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "extendedAgentCard": false
  },
  "defaultInputModes": [
    "application/json"
  ],
  "defaultOutputModes": [
    "application/json"
  ],
  "securityRequirements": [],
  "skills": [
    {
      "id": "prepare-json-evidence-verification",
      "name": "Prepare JSON evidence verification",
      "description": "Revalidate a bounded request, spend policy, and precheck receipt digest; create or reuse an idempotent bound quote; and return exact x402 purchase instructions. Paid execution remains an explicit later step.",
      "tags": [
        "json",
        "verification",
        "x402",
        "quote"
      ],
      "examples": [
        "Quote a deterministic check that /status equals ready in supplied JSON."
      ],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ],
      "securityRequirements": []
    }
  ]
}