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 12 APIs on the APIs.io network, including Comments API, Discovery API, FAQ API, and 9 more. Tagged areas include Company, Biotechnology, Pharmaceuticals, Life Sciences, and Drug Discovery.

Ethyreal Bio’s developer surface includes product news, support, authentication, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

32.5/100 thin ▬ flat Agent 42/100 agent ready Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0

12 APIs

CompanyBiotechnologyPharmaceuticalsLife SciencesDrug DiscoveryClinical TrialsImmunologyEndocrinologyAntibodiesRare DiseaseHealthContent

Kin Score

Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0

Composite quality — 32.5/100 · thin

Contract Quality 11.5 / 21

Developer Ergonomics 3.7 / 17

Commercial Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Governance 2.1 / 10

Discoverability 6.9 / 9

Regulatory Posture 4.7 / 15

Agent readiness — 42/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 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

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.

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/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 12

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

Open Collections 13

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

Rate Limits 1

Documented rate limits and quota policies.

AGENTIC

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions

Conventions

Conformance

Conformance

Lifecycle

Lifecycle

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
image: https://www.ethyrealbio.com/wp-content/uploads/logo.png
specificationVersion: '0.20'
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:ethyreal-bio-comments-api
  name: Ethyreal Bio Comments API
  description: The Comments API from Ethyreal Bio — 7 operation(s) for comments on the ethyrealbio.com WordPress REST surface.
    The collection is anonymously readable and currently returns zero items; write operations require authentication.
  humanURL: https://www.ethyrealbio.com/news/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Comments
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-comments-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-discovery-api
  name: Ethyreal Bio Discovery API
  description: The Discovery API from Ethyreal Bio — 6 operation(s) exposing the WordPress content-type, taxonomy and post-status
    registries that describe the rest of the ethyrealbio.com content surface.
  humanURL: https://www.ethyrealbio.com/news/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-discovery-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-faq-api
  name: Ethyreal Bio FAQ API
  description: The FAQ API from Ethyreal Bio — 14 operation(s) over the Avada theme avada_faq custom post type and its faq_category
    taxonomy. The routes are registered and anonymously readable but currently hold zero published items.
  humanURL: https://www.ethyrealbio.com/patients/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - FAQ
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-faq-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-media-api
  name: Ethyreal Bio Media API
  description: The Media API from Ethyreal Bio — 8 operation(s) over the ethyrealbio.com media library, which holds 57 items
    including the leadership and board headshots and the ETHY-001 program artwork.
  humanURL: https://www.ethyrealbio.com/news/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Media
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-media-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-news-api
  name: Ethyreal Bio News API
  description: The News API from Ethyreal Bio — 7 operation(s) over the WordPress posts collection, which carries the company's
    press releases including the June 2026 emergence-from-stealth announcement and the ENDO 2026 preclinical data release.
  humanURL: https://www.ethyrealbio.com/news/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - News
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-news-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-pages-api
  name: Ethyreal Bio Pages API
  description: The Pages API from Ethyreal Bio — 7 operation(s) over the corporate pages, including About Us, Our Program,
    Disease Areas, Patients, Contact, the Expanded Access Policy, the Terms of Use and the Privacy Policy.
  humanURL: https://www.ethyrealbio.com/about-us/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Pages
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-pages-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-people-api
  name: Ethyreal Bio People API
  description: The People API from Ethyreal Bio — 14 operation(s) over the team_member custom post type and its team_group
    taxonomy, which publish the company's ten leadership and board-of-directors profiles grouped into Leadership and Board
    of Directors.
  humanURL: https://www.ethyrealbio.com/about-us/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - People
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-people-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-portfolio-api
  name: Ethyreal Bio Portfolio API
  description: The Portfolio API from Ethyreal Bio — 28 operation(s) over the Avada theme avada_portfolio custom post type
    and its portfolio_category, portfolio_skills and portfolio_tags taxonomies. The routes are registered and anonymously
    readable but currently hold zero published items.
  humanURL: https://www.ethyrealbio.com/our-program/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Portfolio
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-portfolio-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-search-api
  name: Ethyreal Bio Search API
  description: The Search API from Ethyreal Bio — 1 operation providing site-wide search across the ethyrealbio.com posts,
    pages, team members and taxonomy terms.
  humanURL: https://www.ethyrealbio.com/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-search-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-settings-api
  name: Ethyreal Bio Settings API
  description: The Settings API from Ethyreal Bio — 4 operation(s) over the site settings document. The route is authentication-gated;
    an anonymous GET returns HTTP 401 rest_forbidden.
  humanURL: https://www.ethyrealbio.com/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Settings
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-settings-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-taxonomy-api
  name: Ethyreal Bio Taxonomy API
  description: The Taxonomy API from Ethyreal Bio — 14 operation(s) over the categories and tags that classify ethyrealbio.com
    content. Three categories are published, of which News carries the press releases.
  humanURL: https://www.ethyrealbio.com/news/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Taxonomy
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-taxonomy-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
- aid: ethyreal-bio:ethyreal-bio-users-api
  name: Ethyreal Bio Users API
  description: The Users API from Ethyreal Bio — 21 operation(s) over WordPress author accounts and their application passwords.
    The route is authentication-gated; an anonymous GET returns HTTP 403 rest_user_cannot_view.
  humanURL: https://www.ethyrealbio.com/
  baseURL: https://www.ethyrealbio.com/wp-json/wp/v2
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/ethyreal-bio-users-api-openapi.yml
  - type: DataModel
    url: data-model/ethyreal-bio-data-model.yml
  - type: ErrorCatalog
    url: errors/ethyreal-bio-problem-types.yml
  - type: Examples
    url: examples/ethyreal-bio-examples.yml
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
x-enrichment:
  date: '2026-08-12'
  status: enriched
  artifacts_added: 35
  pass: local-v1