KG-NINJA

KG-NINJA is the operator identity (GitHub user KG-NINJA, Osaka; Cloudflare Wallet handle @kgninja) behind Agent Verification Utility at agent-economy.kgninja.dev, a Cloudflare Workers service (v0.4.3) that runs bounded deterministic checks (SHA-256 equality, JSON Pointer existence/equality/type) over caller-supplied inline JSON and returns an Ed25519-signed execution record, sold to agents per call for 10000 atomic USDC ($0.01) on Base through x402 v2 with no account, API key or OAuth. One origin exposes the product three ways — a 44-operation OpenAPI 3.1.0 contract at /openapi.json, a remote Streamable HTTP MCP server at /mcp answering an anonymous tools/list (five tools, one paid), and an A2A 1.0 agent card at /.well-known/agent-card.json with JSON-RPC at /a2a — plus an RFC 9727 API catalog, an MCP Registry server.json, a provider-published Agent Skill, a JWKS, an x402 manifest, llms.txt and Content-Signal. The apex kgninja.dev has no A record; the subdomain is its only web presence.

KG-NINJA publishes 10 API contracts indexed on the APIs.io network, including A2a API, Decision Support API, Discovery API, and 7 more. Tagged areas include Agents, Agentic Commerce, A2A, MCP, and x402.

KG-NINJA’s developer surface includes authentication, documentation, getting-started guide, API reference, FAQ, pricing, sandbox, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub
37.7/100 thin ▬ flat Agent 55/100 agent native Front door AI 3/6 light Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0
2 published contracts 1 MCP Servers
AgentsAgentic CommerceA2AMCPx402VerificationJSONCryptographyCloudflare WorkersAgent-NativeJapan

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0
Composite quality — 37.7/100 · thin
Contract Quality 7.9 / 19
Developer Ergonomics 8.2 / 15
Access Clarity 4.7 / 15
Operational Transparency 0.5 / 10
Contract Governance 1.6 / 9
Discoverability 5.6 / 8
Regulatory Posture 2.5 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 55/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 3 / 3
A2A Agent Card 8 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/kgninja-dev: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

JSON
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified
x402
tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

Agent Verification Utility MCP Server

Remote Model Context Protocol server at https://agent-economy.kgninja.dev/mcp — stateless Streamable HTTP, POST only (GET returns 405), serverInfo dev.kgninja/agent-verification...

Agent Verification Utility A2A Agent

Agent2Agent (A2A) 1.0 surface: an agent card served from https://agent-economy.kgninja.dev/.well-known/agent-card.json (supportedInterfaces[] JSONRPC at https://agent-economy.kg...

KG-NINJA A2a API

Synchronous A2A 1.0 JSON-RPC quote preparation

KG-NINJA Decision Support API

Free use-case selection and request validation before payment

KG-NINJA Discovery API

Machine-readable service discovery

KG-NINJA Goals API

Goal-driven revenue measurement and improvement recommendations

KG-NINJA MCP API

Stateless MCP Streamable HTTP transport

KG-NINJA Operations API

Availability and operational status

KG-NINJA Purchase API

Quote and paid verification operations

KG-NINJA Registration API

Optional anonymous, short-lived agent registration

Scroll for all 10

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

KG-NINJA MCP Server

KG-NINJA operates ONE remote MCP server at https://agent-economy.kgninja.dev/mcp — the same origin as its website, OpenAPI and A2A endpoint. It is stateless Streamable HTTP, POS...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Kgninja Dev Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Kgninja Dev Rate Limits

0 limits

RATE LIMITS

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Kgninja Dev Openapi Overlay

6 actions · update · kgninja-dev-openapi.json

GENERATED

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Kgninja Dev Authentication

http · 1 scheme

SECURITY

Kgninja Dev Domain Security

TLSv1.3 · HSTS · DNSSEC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Kgninja Dev Agentic Access

44 operations · 6 acting

44 operations · 6 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 7

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 WellKnown
WellKnown
 LLMsTxt
LLMsTxt
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill
 AgentSkill
AgentSkill

Scroll for all 7

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 ToolCrosswalk
ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

FAQ
FAQ
 RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Plans
Plans

Company 1

The organization behind the API

Website
Website

Other 4

Properties that don't map to a standard resource type

AgentCard
AgentCard
 APICatalog
APICatalog
 ContentSignal
ContentSignal
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: kgninja-dev
name: KG-NINJA
description: KG-NINJA is the operator identity (GitHub user KG-NINJA, Osaka; Cloudflare Wallet handle @kgninja) behind Agent
  Verification Utility at agent-economy.kgninja.dev, a Cloudflare Workers service (v0.4.3) that runs bounded deterministic
  checks (SHA-256 equality, JSON Pointer existence/equality/type) over caller-supplied inline JSON and returns an Ed25519-signed
  execution record, sold to agents per call for 10000 atomic USDC ($0.01) on Base through x402 v2 with no account, API key
  or OAuth. One origin exposes the product three ways — a 44-operation OpenAPI 3.1.0 contract at /openapi.json, a remote Streamable
  HTTP MCP server at /mcp answering an anonymous tools/list (five tools, one paid), and an A2A 1.0 agent card at /.well-known/agent-card.json
  with JSON-RPC at /a2a — plus an RFC 9727 API catalog, an MCP Registry server.json, a provider-published Agent Skill, a JWKS,
  an x402 manifest, llms.txt and Content-Signal. The apex kgninja.dev has no A record; the subdomain is its only web presence.
url: https://raw.githubusercontent.com/api-evangelist/kgninja-dev/refs/heads/main/apis.yml
image: https://agent-economy.kgninja.dev/icon.svg
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Agents
- Agentic Commerce
- A2A
- MCP
- x402
- Verification
- JSON
- Cryptography
- Cloudflare Workers
- Agent-Native
- Japan
tags_raw:
- Agents
- Agent commerce
- A2A
- MCP
- x402
- Verification
- JSON
- Cryptography
- Cloudflare Workers
- Agent-native
- Japan
- Agent Commerce
- agent-native
apis:
- aid: kgninja-dev:agent-verification-utility-mcp-server
  name: Agent Verification Utility MCP Server
  image: https://agent-economy.kgninja.dev/icon.svg
  description: 'Remote Model Context Protocol server at https://agent-economy.kgninja.dev/mcp — stateless Streamable HTTP,
    POST only (GET returns 405), serverInfo dev.kgninja/agent-verification-utility 0.4.3, protocol version 2025-06-18 negotiated
    live and 2026-07-28 declared on the server card. initialize and tools/list answer anonymously with five tools carrying
    real inputSchemas and MCP annotations: four free (describe_verify_evidence, get_revenue_goal_status, quote_verify_evidence,
    prepare_verify_evidence_purchase) and one paid (verify_evidence), whose unpaid call returns an x402 v2 PaymentRequired
    document in _meta["x402/error"] and is retried with _meta["x402/payment"]. resources/list and prompts/list are not implemented.
    Published alongside it: an MCP Registry server.json, an experimental MCP Server Card, a Cloudflare Agent Readiness card
    at /.well-known/mcp/server-card.json (aliased at /.well-known/mcp.json), a registry HTTP ownership proof and a browser
    WebMCP bridge (webmcp.js).'
  humanURL: https://agent-economy.kgninja.dev/docs/mcp-x402-interoperability
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - MCP
  - Agent-Native
  - x402
  tags_raw:
  - MCP
  - agent-native
  - x402
  properties:
  - type: MCPServer
    url: mcp/kgninja-dev-mcp.yml
  - type: MCPServer
    name: MCP endpoint (Streamable HTTP)
    url: https://agent-economy.kgninja.dev/mcp
  - type: ToolCrosswalk
    url: mcp/kgninja-dev-tool-crosswalk.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/mcp-x402-interoperability
- aid: kgninja-dev:agent-verification-utility-a2a-agent
  name: Agent Verification Utility A2A Agent
  image: https://agent-economy.kgninja.dev/icon.svg
  description: 'Agent2Agent (A2A) 1.0 surface: an agent card served from https://agent-economy.kgninja.dev/.well-known/agent-card.json
    (supportedInterfaces[] JSONRPC at https://agent-economy.kgninja.dev/a2a, protocolVersion 1.0, version 0.4.3, provider
    KG-NINJA) declaring one skill, prepare-json-evidence-verification, which revalidates a prechecked paid intent, creates
    or reuses an idempotent bound quote and returns exact x402 and MCP purchase instructions as a direct Message. The adapter
    is stateless and synchronous: it never creates Tasks, never executes paid work, and declares streaming, push notifications
    and extended cards unsupported. The endpoint enforces the A2A-Version header (0.3 is rejected with -32009 VERSION_NOT_SUPPORTED;
    1.0 is required).'
  humanURL: https://agent-economy.kgninja.dev/docs/mcp-x402-interoperability
  baseURL: https://agent-economy.kgninja.dev/a2a
  tags:
  - A2A
  - Agent-Native
  - x402
  tags_raw:
  - A2A
  - agent-native
  - x402
  properties:
  - type: AgentCard
    url: a2a/kgninja-dev-a2a.yml
  - type: AgentCard
    name: A2A Agent Card (provider-hosted)
    url: https://agent-economy.kgninja.dev/.well-known/agent-card.json
- aid: kgninja-dev:kgninja-dev-a2a-api
  name: KG-NINJA A2a API
  description: Synchronous A2A 1.0 JSON-RPC quote preparation
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - A2A
  tags_raw:
  - a2a
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-a2a-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-decision-support-api
  name: KG-NINJA Decision Support API
  description: Free use-case selection and request validation before payment
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - Decision Support
  tags_raw:
  - decision-support
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-decision-support-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-discovery-api
  name: KG-NINJA Discovery API
  description: Machine-readable service discovery
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - Discovery
  tags_raw:
  - discovery
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-discovery-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-goals-api
  name: KG-NINJA Goals API
  description: Goal-driven revenue measurement and improvement recommendations
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - Goals
  tags_raw:
  - goals
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-goals-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-mcp-api
  name: KG-NINJA MCP API
  description: Stateless MCP Streamable HTTP transport
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - MCP
  tags_raw:
  - mcp
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-mcp-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-operations-api
  name: KG-NINJA Operations API
  description: Availability and operational status
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags: []
  tags_raw:
  - operations
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-operations-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-purchase-api
  name: KG-NINJA Purchase API
  description: Quote and paid verification operations
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - Purchase
  tags_raw:
  - purchase
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-purchase-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
- aid: kgninja-dev:kgninja-dev-registration-api
  name: KG-NINJA Registration API
  description: Optional anonymous, short-lived agent registration
  humanURL: https://agent-economy.kgninja.dev/
  baseURL: https://agent-economy.kgninja.dev/mcp
  tags:
  - Registration
  tags_raw:
  - registration
  properties:
  - type: OpenAPI
    url: openapi/kgninja-dev-registration-api-openapi.yml
  - type: Documentation
    url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
  - type: APIReference
    url: https://agent-economy.kgninja.dev/openapi.json
  - type: GettingStarted
    url: https://agent-economy.kgninja.dev/index.md
  - type: Conventions
    url: conventions/kgninja-dev-conventions.yml
  - type: ErrorCatalog
    url: errors/kgninja-dev-problem-types.yml
  - type: DataModel
    url: data-model/kgninja-dev-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/kgninja-dev-domain-security.yml
- type: AgenticAccess
  url: agentic-access/kgninja-dev-agentic-access.yml
- type: Authentication
  url: authentication/kgninja-dev-authentication.yml
- type: Website
  url: https://agent-economy.kgninja.dev/
- type: Documentation
  url: https://agent-economy.kgninja.dev/docs/deterministic-json-verification
- type: GettingStarted
  url: https://agent-economy.kgninja.dev/index.md
- type: APIReference
  url: https://agent-economy.kgninja.dev/openapi.json
- type: FAQ
  url: https://agent-economy.kgninja.dev/faq
- type: Pricing
  name: Published price (agent manifest payment block)
  url: https://agent-economy.kgninja.dev/agent.json
- type: GitHubOrganization
  url: https://github.com/KG-NINJA
- type: AgentCard
  url: a2a/kgninja-dev-a2a.yml
- type: MCPServer
  url: mcp/kgninja-dev-mcp.yml
- type: ToolCrosswalk
  url: mcp/kgninja-dev-tool-crosswalk.yml
- type: WellKnown
  url: well-known/kgninja-dev-well-known.yml
- type: APICatalog
  url: well-known/kgninja-dev-api-catalog.json
- type: ContentSignal
  url: https://agent-economy.kgninja.dev/robots.txt
- type: LLMsTxt
  url: llms/kgninja-dev-llms.txt
- type: LLMsTxt
  name: llms.txt (provider-hosted)
  url: https://agent-economy.kgninja.dev/llms.txt
- type: AgentSkill
  url: skills/_index.yml
- type: AgentSkill
  name: verify-json-evidence SKILL.md (provider-hosted)
  url: https://agent-economy.kgninja.dev/.well-known/agent-skills/verify-json-evidence/SKILL.md
- type: Conventions
  url: conventions/kgninja-dev-conventions.yml
- type: Idempotency
  url: conventions/kgninja-dev-conventions.yml
- type: ErrorCatalog
  url: errors/kgninja-dev-problem-types.yml
- type: DataModel
  url: data-model/kgninja-dev-data-model.yml
- type: RateLimits
  url: rate-limits/kgninja-dev-rate-limits.yml
- type: Plans
  url: plans/kgninja-dev-plans-pricing.yml
- type: Sandbox
  url: sandbox/kgninja-dev-sandbox.yml
- type: Conformance
  url: conformance/kgninja-dev-conformance.yml
- type: Lifecycle
  url: lifecycle/kgninja-dev-lifecycle.yml
- type: Overlay
  url: overlays/kgninja-dev-openapi-overlay.yaml
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 37
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://agent-economy.kgninja.dev/.well-known/agent-card.json
  grade: flavored
  protocol_version: '1.0'
  control: 404

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