# HORIZON SHIELD

**Canonical:** https://apis.io/providers/horizonshield-dev/  
**Website:** https://shield.the-horizons-innovation.com/  
**APIs profiled:** 1

The HORIZ音s株式会社 (The HORIZONs Co., Ltd., Hiratsuka, Kanagawa) operates HORIZON SHIELD, a buyer-side, agent-native fair-price verification service for Japanese construction and renovation estimates, built by a 30-year master carpenter on the open JCCDB dataset (95,403 items, CC BY 4.0). Its flagship KIRA server at mcp.horizonshield.dev is a free, anonymous remote MCP server (15 tools, 5 prompts) and A2A agent that audits a quoted price against fair ranges, flags overcharge tactics, and issues SHA-256 receipts anchored to Bitcoin via OpenTimestamps; a FairPriceAttestation tool bridges to Google's AP2 Cart Mandate. Around it sit a public MCP Verification Gate (the family's one OpenAPI, plus MCP and A2A) that measures other people's MCP servers against an A2A Conduct Extension the company authors, the JIDEC append-only verification ledger with an RFC 9727 api-catalog, the Yakumo verified-contractor directory MCP, a WebMCP intake server and a femtech source registry — every card JWS-signed, every surface unauthenticated by design, and paid for by buyers rather than contractors.

## Kin Score — 54.2 / 100 (developing)

Scored 2026-10-09 under rubric 0.23.0. Trend: flat (+0.0 from 54.2).

| Facet | Score |
|---|---|
| Discoverability | 86.7 |
| Contract Quality | 43.5 |
| Contract Governance | 18.2 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 69.0 |
| Access Clarity | 63.2 |

Regulatory layer — **Government & Public Sector**: 30.4 (matched via tags).

## Agent readiness — 36.2 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | derived |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | yes |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | conformant |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## APIs (28)

- **HORIZON SHIELD KIRA MCP Server** — Remote Model Context Protocol server at https://mcp.horizonshield.dev/ (Streamable HTTP, POST only, protocol 2025-06-18, serverInfo horizon-shield 1.0.9, listed on registry.mode...
- **HORIZON SHIELD KIRA A2A Agent** — Agent2Agent surface of the same service: a JWS-signed agent card at https://mcp.horizonshield.dev/.well-known/agent-card.json (protocolVersion 0.3.0 with 1.0-style supportedInte...
- **JIDEC Verification Ledger API** — Append-only, Bitcoin-anchored (OpenTimestamps) public ledger of the verification process at https://ledger.horizonshield.dev: an index of anchored entries, per-entry raw bytes a...
- **Yakumo Verified-Contractor Directory MCP** — Remote MCP server at https://hearing.horizonshield.dev/mcp (serverInfo HORIZON SHIELD YAKUMO 2.3.1, protocol 2025-06-18) exposing six read-only tools over the Yakumo mall, where...
- **HORIZON SHIELD WebMCP Intake Server** — A second public MCP endpoint at https://web.horizonshield.dev/mcp (serverInfo hs-webmcp 1.0.4, protocol 2025-06-18; server.json published at shield.the-horizons-innovation.com/s...
- **HORIZON SHIELD Femtech Source Registry MCP** — A separate product line by the same company: a neutral, verifiable registry of femtech information sources exposed as a remote MCP server at https://femtech.horizonshield.dev/mc...
- **HORIZON SHIELD Badge API** — The Badge API from HORIZON SHIELD — 2 operation(s) for badge.
- **HORIZON SHIELD Changes API** — The Changes API from HORIZON SHIELD — 1 operation(s) for changes.
- **HORIZON SHIELD Check API** — The Check API from HORIZON SHIELD — 1 operation(s) for check.
- **HORIZON SHIELD E API** — The E API from HORIZON SHIELD — 1 operation(s) for e.
- **HORIZON SHIELD Embed API** — The Embed API from HORIZON SHIELD — 1 operation(s) for embed.
- **HORIZON SHIELD Ext API** — The Ext API from HORIZON SHIELD — 1 operation(s) for ext.
- **HORIZON SHIELD Feed.xml API** — The Feed.xml API from HORIZON SHIELD — 1 operation(s) for feed.xml.
- **HORIZON SHIELD Health API** — The Health API from HORIZON SHIELD — 1 operation(s) for health.
- **HORIZON SHIELD History API** — The History API from HORIZON SHIELD — 1 operation(s) for history.
- **HORIZON SHIELD MCP API** — The Mcp API from HORIZON SHIELD — 1 operation(s) for mcp.
- **HORIZON SHIELD Mould API** — The Mould API from HORIZON SHIELD — 1 operation(s) for mould.
- **HORIZON SHIELD Nenrin API** — The Nenrin API from HORIZON SHIELD — 1 operation(s) for nenrin.
- **HORIZON SHIELD Recompute API** — The Recompute API from HORIZON SHIELD — 1 operation(s) for recompute.
- **HORIZON SHIELD Register API** — The Register API from HORIZON SHIELD — 2 operation(s) for register.
- **HORIZON SHIELD Self API** — The Self API from HORIZON SHIELD — 1 operation(s) for self.
- **HORIZON SHIELD Sitemap.xml API** — The Sitemap.xml API from HORIZON SHIELD — 1 operation(s) for sitemap.xml.
- **HORIZON SHIELD Spec API** — The Spec API from HORIZON SHIELD — 1 operation(s) for spec.
- **HORIZON SHIELD Sweep API** — The Sweep API from HORIZON SHIELD — 1 operation(s) for sweep.
- **HORIZON SHIELD Verified.json API** — The Verified.json API from HORIZON SHIELD — 1 operation(s) for verified.json.
- **HORIZON SHIELD Verify Event API** — The Verify Event API from HORIZON SHIELD — 1 operation(s) for verify event.
- **HORIZON SHIELD Watchlist API** — The Watchlist API from HORIZON SHIELD — 1 operation(s) for watchlist.
- **HORIZON SHIELD .well Known API** — The .well Known API from HORIZON SHIELD — 2 operation(s) for .well known.

## MCP servers (6)

- **HORIZON SHIELD MCP Server** — HORIZON SHIELD operates a FAMILY of remote MCP servers on subdomains of horizonshield.dev (the apex resolves to nothing; see well-known/). The flagship is https://mcp.horizonshi...
- **JIDEC read-only MCP endpoint**
- **Yakumo MCP endpoint (Streamable HTTP, POST)**
- **WebMCP intake endpoint (Streamable HTTP, POST)**
- **Femtech registry MCP endpoint**
- **HORIZON SHIELD MCP Server**

## Agentic access (1)

- **Horizonshield Dev Agentic Access** — 25 operations · 4 acting

## Security (3)

- **Horizonshield Dev Authentication** — 0 schemes
- **Horizonshield Dev Domain Security** — TLSv1.3 · DMARC
- **Horizonshield Dev Vulnerability Disclosure** — Hackerone

## Plans (1)

- **Horizonshield Dev Plans Pricing**

## Tags

Construction, Renovation, Cost Estimation, Fair Pricing, Consumer Protection, Verification, Transparency Ledger, Open Data, MCP, A2A, AP2, Agents, Agent-Native, Japan

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/horizonshield-dev/). Scores are computed from the provider's own public artifacts under a published rubric.