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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Ethyreal Bio the way a machine reads it — 30 machine-readable artifacts across 12 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Ethyreal Bio scores 32.5/100 (thin), with a separate agent-readiness read of 42/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
Put this on your own site. The badge is drawn live from Ethyreal Bio's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/ethyreal-bio/"
title="Ethyreal Bio on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/ethyreal-bio.svg"
alt="Ethyreal Bio Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/ethyreal-bio/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/ethyreal-bio/"
title="Ethyreal Bio on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/ethyreal-bio/card.svg"
alt="Ethyreal Bio Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Ethyreal Bio
Each block below is one kind of artifact we hold for Ethyreal Bio. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 12
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Ethyreal Bio Comments API
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...
Ethyreal Bio Discovery API
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 conte...
Ethyreal Bio FAQ API
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...
Ethyreal Bio Media API
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 progr...
Ethyreal Bio News API
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 an...
Ethyreal Bio Pages API
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 Ter...
Ethyreal Bio People API
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-dir...
Ethyreal Bio Portfolio API
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 taxon...
Ethyreal Bio Search API
The Search API from Ethyreal Bio — 1 operation providing site-wide search across the ethyrealbio.com posts, pages, team members and taxonomy terms.
Ethyreal Bio Settings API
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.
Ethyreal Bio Taxonomy API
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 th...
Ethyreal Bio Users API
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 HTT...
Scroll within the panel for all 12 ·
Open Collections 13
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Comments API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) FAQ API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Media API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) News API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Pages API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) People API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Search API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Settings API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Taxonomy API
OPEN COLLECTIONEthyreal Bio Content API (WordPress REST wp/v2) Users API
OPEN COLLECTIONScroll within the panel for all 13 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Ethyreal Bio Rate Limits
RATE LIMITSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Ethyreal Bio — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 5
The organization behind the API
Other 4
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/ethyreal-bio · machine-readable index on apis.io
This is an independent, third-party profile of Ethyreal Bio, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.