Ethyreal Bio

Ethyreal Bio is a Cambridge, Massachusetts clinical-stage biotechnology company founded in 2024 and headquartered at 700 Technology Square, developing precision therapies for thyroid diseases with high unmet need. It emerged from stealth on 10 June 2026 with $101 million in combined Series A and Series B financing — the Series A co-led by Atlas Venture and Medicxi alongside Nandi Life Sciences and Checkpoint Capital, the Series B led by Avoro Capital. Its lead program ETHY-001 is a monoclonal antibody that blocks autoantibody-mediated activation of the thyroid stimulating hormone receptor (TSHR), the shared pathogenic driver of Graves' disease and thyroid eye disease; it is formulated for subcutaneous administration with half-life extension technology for infrequent dosing, and first-in-human trials were planned for the second half of 2026. Ethyreal Bio publishes no developer program, no product API, no SDKs and no OpenAPI definition of its own. The only machine-readable surface on ethyrealbio.com is the WordPress REST API (wp/v2) that the company website exposes at /wp-json/, which serves its press releases, corporate pages, leadership and board-of-directors profiles, media library, taxonomies and site search as JSON. The OpenAPI documents in this repository were derived mechanically by API Evangelist from that route-discovery descriptor.

Ethyreal Bio publishes 1 API on the APIs.io network. Tagged areas include Company, Biotechnology, Pharmaceuticals, Life Sciences, and Drug Discovery.

Ethyreal Bio’s developer surface includes product news, support, authentication, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub

18.4/100 emerging ▬ flat Agent 9/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

1 APIs

Company Biotechnology Pharmaceuticals Life Sciences Drug Discovery Clinical Trials ImmunologyEndocrinologyAntibodies Rare Disease Health Content

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 18.4/100 · emerging

Contract Quality 0.4 / 21

Developer Ergonomics 4.8 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.5 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.9 / 15

Agent readiness — 9/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 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 Health 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/ethyreal-bio: 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 →

APIs 1

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

Ethyreal Bio Website (WordPress REST)

The public WordPress REST API (wp-json) of the Ethyreal Bio website at www.ethyrealbio.com: the route index of the site's content management system, catalogued as one site surfa...

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Ethyreal Bio Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Ethyreal Bio Rate Limits

0 limits

RATE LIMITS

Security Posture 2

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

Ethyreal Bio Authentication

http · 1 scheme

SECURITY

Ethyreal Bio Domain Security

TLSv1.3

SECURITY

Agentic Access 1

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

Ethyreal Bio Agentic Access

131 operations · 89 acting · 5 human-in-the-loop

131 operations · 89 acting

AGENTIC

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

Lifecycle

DataModel

ErrorCatalog

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 5

The organization behind the API

Website

About

News

BlogRSS

LinkedIn

Other 4

Properties that don't map to a standard resource type

Team

Pipeline

SecondaryMarket

Overlay

Source (apis.yml)

aid: ethyreal-bio
name: Ethyreal Bio
description: Ethyreal Bio is a Cambridge, Massachusetts clinical-stage biotechnology company founded in 2024 and headquartered
  at 700 Technology Square, developing precision therapies for thyroid diseases with high unmet need. It emerged from stealth
  on 10 June 2026 with $101 million in combined Series A and Series B financing — the Series A co-led by Atlas Venture and
  Medicxi alongside Nandi Life Sciences and Checkpoint Capital, the Series B led by Avoro Capital. Its lead program ETHY-001
  is a monoclonal antibody that blocks autoantibody-mediated activation of the thyroid stimulating hormone receptor (TSHR),
  the shared pathogenic driver of Graves' disease and thyroid eye disease; it is formulated for subcutaneous administration
  with half-life extension technology for infrequent dosing, and first-in-human trials were planned for the second half of
  2026. Ethyreal Bio publishes no developer program, no product API, no SDKs and no OpenAPI definition of its own. The only
  machine-readable surface on ethyrealbio.com is the WordPress REST API (wp/v2) that the company website exposes at /wp-json/,
  which serves its press releases, corporate pages, leadership and board-of-directors profiles, media library, taxonomies
  and site search as JSON. The OpenAPI documents in this repository were derived mechanically by API Evangelist from that
  route-discovery descriptor.
url: https://raw.githubusercontent.com/api-evangelist/ethyreal-bio/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment-pipeline
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-09-03'
  method: derived
image: https://www.ethyrealbio.com/wp-content/uploads/logo.png
specificationVersion: '0.23'
created: '2026-08-12'
modified: '2026-08-12'
tags:
- Company
- Biotechnology
- Pharmaceuticals
- Life Sciences
- Drug Discovery
- Clinical Trials
- Immunology
- Endocrinology
- Antibodies
- Rare Disease
- Health
- Content
apis:
- aid: ethyreal-bio:ethyrealbio-com-website-wordpress-rest
  name: Ethyreal Bio Website (WordPress REST)
  description: 'The public WordPress REST API (wp-json) of the Ethyreal Bio website at www.ethyrealbio.com: the route index
    of the site''s content management system, catalogued as one site surface rather than as separate APIs.'
  baseURL: https://www.ethyrealbio.com/wp-json
  tags:
  - WordPress
  x-surface: platform-generated
  properties:
  - type: Documentation
    url: https://www.ethyrealbio.com/wp-json
  x-platform: wordpress
  x-platform-surface: rest
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/ethyreal-bio-agentic-access.yml
- type: DomainSecurity
  url: security/ethyreal-bio-domain-security.yml
- type: Website
  url: https://www.ethyrealbio.com/
- type: About
  url: https://www.ethyrealbio.com/about-us/
- type: News
  url: https://www.ethyrealbio.com/news/
- type: BlogRSS
  url: https://www.ethyrealbio.com/feed/
- type: Support
  url: https://www.ethyrealbio.com/contact/
- type: Team
  url: https://www.ethyrealbio.com/about-us/
- type: Pipeline
  url: https://www.ethyrealbio.com/our-program/
- type: TermsOfService
  url: https://www.ethyrealbio.com/terms-of-use/
- type: PrivacyPolicy
  url: https://www.ethyrealbio.com/privacy-policy/
- type: LinkedIn
  url: https://www.linkedin.com/company/ethyreal-bio
- type: SecondaryMarket
  url: https://forgeglobal.com/ethyreal-bio_stock/
- type: Overlay
  url: overlays/ethyreal-bio-content-overlay.yaml
- type: Packages
  url: packages/ethyreal-bio-packages.yml
- type: LLMsTxt
  url: llms/ethyreal-bio-llms.txt
- type: Authentication
  url: authentication/ethyreal-bio-authentication.yml
- type: Conventions
  url: conventions/ethyreal-bio-conventions.yml
- type: Conformance
  url: conformance/ethyreal-bio-conformance.yml
- type: Lifecycle
  url: lifecycle/ethyreal-bio-lifecycle.yml
- type: RateLimits
  url: rate-limits/ethyreal-bio-rate-limits.yml
- type: Plans
  url: plans/ethyreal-bio-plans-pricing.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/ethyreal-bio-data-model.yml
- type: ErrorCatalog
  url: errors/ethyreal-bio-problem-types.yml
x-enrichment:
  date: '2026-08-12'
  status: enriched
  artifacts_added: 35
  pass: local-v1

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