HORIZON SHIELD Femtech Registry

A neutral, verifiable registry of femtech (women's health) information sources. It does not diagnose, does not claim products work, does not take referral fees, and does not pretend to be a medical authority. It verifies who stands behind a source, under which jurisdiction, with what compensation, and lets anyone re-compute the proof.

Live endpoint: https://femtech.horizonshield.dev (also https://hs-femtech-mcp.oga-surf-project.workers.dev)

Verified

This server passes the HORIZON SHIELD Verification Gate (status: verified): reachable, MCP conformant, agent-card published, compensation disclosed (paid_by: public, no referral or listing fees), and deterministic. It holds itself to the same bar it would apply to anyone else. Re-check it yourself, no trust in us required:

curl -s -X POST "https://hs-verify-gate.oga-surf-project.workers.dev/check" \
  -H "content-type: application/json" \
  -d '{"endpoint":"https://femtech.horizonshield.dev/"}'

Related MCP server: ebp-directory

Why this exists

Women's health is a credence-goods market: buyers cannot easily judge quality, and noise, advertising and referral-driven "recommendations" crowd out primary sources. As front LLMs start recommending femtech, the hard problem is not more content, it is trust: who published this, are they authoritative, do they get paid to say it, and can the claim be re-checked?

This server is the trust rail, not the oracle. It never becomes the medical authority. It indexes authoritative sources and makes their provenance, jurisdiction and compensation machine-readable and re-computable.

The design principle: do not call "verified" what you cannot verify. We verify existence, authority tier, jurisdiction, disclosure and re-computability. We do not adjudicate medical truth.

What it does / does not

Does

• Indexes femtech information sources with publisher, authority tier, jurisdiction, evidence URL and machine-readable compensation.

• Verifies each entry deterministically (SHA-256) so a third party can re-compute the proof.

• Returns neutral, source-linked general information, always with a disclaimer.

• Discloses its own compensation (referral_fee: false, listing_fee: false) and passes its own bar at /self.

Does not (enforced in code, fail-closed)

• Diagnose (no symptom to condition tool).

• Claim a product is effective, or rank brands.

• Recommend or take referral / listing fees for any source.

• Store personal health data.

• Claim medical authority or make cross-jurisdiction medical judgments.

The registry model

Each entry is one information source:

{
  "entry_id": "acog_pms_en",
  "kind": "source",
  "publisher": "American College of Obstetricians and Gynecologists (ACOG)",
  "authority_tier": "A_public_or_academic",
  "jurisdiction": "US",
  "lang": "en",
  "topic": "pms",
  "evidence_url": "https://www.acog.org/",
  "compensation": { "paid_by": "none", "referral_fee": false, "listing_fee": false },
  "status": "verified",
  "verified_at": "2026-08-27T22:46:08.179Z",
  "provenance_sha256": "…",
  "anchored": false
}

Five conditions to be listed (self-application plus machine verification, no human gatekeeper):

1. A reachable, real evidence source.

2. A declared authority tier (public / academic, medical institution, commercial media).

3. A declared jurisdiction (so no source is treated as "correct everywhere").

4. Machine-readable compensation disclosure (we do not judge the content, we only remove the option to hide it).

5. Determinism and re-computation (SHA-256 anchored, reproducible by anyone).

A source that fails is not "rejected", it is pending. Fix it and re-apply.

Topics (P1)

menstruation · pms · menopause, with authoritative sources across JP / US / GB (JSOG, Japan Society for Menopause and Women's Health, MHLW Healthcare Lab, ACOG, NHS, The Menopause Society, Office on Women's Health).

Quickstart

Self-check (the server declares and proves its own neutrality):

BASE="https://hs-femtech-mcp.oga-surf-project.workers.dev"
curl -s "$BASE/self" | python3 -m json.tool

List the registry (filter by topic / jurisdiction / lang / status):

curl -s "$BASE/registry?topic=menopause" | python3 -m json.tool

MCP over JSON-RPC 2.0:

curl -s -X POST "$BASE/" -H "content-type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

curl -s -X POST "$BASE/" -H "content-type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"get_femtech_topic","arguments":{"topic_id":"pms_basics_en"}}}'

Agent discovery: GET /.well-known/agent-card.json (A2A) and GET /llms.txt (for front LLMs).

Tools

Verifiability

Every entry has a canonical JSON form and a SHA-256 that a third party can re-compute (how_to_verify). Verified entries are listed at /anchor/pending for Bitcoin / JIDEC anchoring (OpenTimestamps), so untamperedness becomes provable with a timestamp. verified means untampered and re-computable, never medically true.

Not a medical service

This service provides source verification and general information only. It does not diagnose, treat, or recommend products. For symptoms or treatment decisions, consult a healthcare professional.

About

Built and operated by The HORIZ音s株式会社, part of HORIZON SHIELD. Same design lineage as the JCCDB open construction-cost dataset and the HORIZON SHIELD verification gate: verifiable, buyer-side, no pay-for-endorsement.

Endpoints

License

MIT. See LICENSE.