Bluejay Therapeutics

Bluejay Therapeutics, Inc. was a clinical-stage biopharmaceutical company headquartered in Redwood City, California, developing treatments for viral hepatitis and liver disease. Its lead asset, brelovitug (BJT-778), is an investigational monoclonal antibody targeting the surface antigen shared by the hepatitis D and hepatitis B viruses; it received U.S. FDA Breakthrough Therapy designation for chronic hepatitis delta and reported a 100% virologic response at week 48 in its Phase 2 monotherapy study before entering the AZURE-2 global Phase 3 trial. The company also advanced a proprietary TLR9 agonist (cavrotolimod), a liver-targeted HBV transcript inhibitor (BJT-628) and a liver-targeted fatty acid synthase inhibitor (BJT-188) toward a combination regimen aimed at functional cure of chronic hepatitis B. Mirum Pharmaceuticals agreed to acquire Bluejay Therapeutics in December 2025 and completed the acquisition on 26 January 2026; the corporate site now serves a single acquisition notice redirecting readers to mirumpharma.com. Bluejay Therapeutics never ran a developer program — no product API, no developer portal, no API documentation, no SDKs, no GitHub organisation and no package-registry presence. The only machine-readable surface reachable without credentials is the WordPress REST content API behind bluejaytx.com, catalogued here. That surface is notable for outliving the web site it belongs to: the marketing page tree was deleted in the teardown, but the REST API and the post archive still serve all 35 press releases and publication notices from 2021 through 2025 with full text.

Bluejay Therapeutics publishes 1 API on the APIs.io network. Tagged areas include Company, Biopharmaceutical, Pharmaceuticals, Life Sciences, and hepatology.

The Bluejay Therapeutics catalog on APIs.io includes 1 JSON-LD context.

Bluejay Therapeutics’ developer surface includes engineering blog, authentication, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub

14.3/100 emerging ▬ flat Agent 6/100 agent aware Front door AI 1/6 silent Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

1 APIs

Company Biopharmaceutical Pharmaceuticals Life ScienceshepatologyInfectious Disease Clinical Trials Drug Development Monoclonal Antibodies content-api

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Corporate Communications Management

BC-850

content

Kin Score

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

Composite quality — 14.3/100 · emerging

Contract Quality 1.8 / 21

Developer Ergonomics 4.4 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.5 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.0 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 0 / 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/bluejay-therapeutics: 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.

Bluejay Therapeutics Website (WordPress REST)

The public WordPress REST API (wp-json) of the Bluejay Therapeutics website at bluejaytx.com: the route index of the site's content management system, catalogued as one site sur...

Open Collections 1

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

API Collection

OPEN COLLECTION

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Bluejay Therapeutics Organization Context

0 classes · 0 properties

JSON-LD

Security Posture 2

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

Bluejay Therapeutics Authentication

1 scheme

SECURITY

Bluejay Therapeutics Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

ErrorCatalog

Lifecycle

DataModel

JSONLD

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Company 4

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

LinkedIn

Other 6

Properties that don't map to a standard resource type

CapabilityMap

Overlay

Publications

Sitemap

Acquirer

SecondaryMarket

Source (apis.yml)

aid: bluejay-therapeutics
name: Bluejay Therapeutics
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-02'
  method: derived
image: https://bluejaytx.com/wp-content/uploads/2023/01/BluejayTx_Logo.png
description: 'Bluejay Therapeutics, Inc. was a clinical-stage biopharmaceutical company headquartered in Redwood City, California,
  developing treatments for viral hepatitis and liver disease. Its lead asset, brelovitug (BJT-778), is an investigational
  monoclonal antibody targeting the surface antigen shared by the hepatitis D and hepatitis B viruses; it received U.S. FDA
  Breakthrough Therapy designation for chronic hepatitis delta and reported a 100% virologic response at week 48 in its Phase
  2 monotherapy study before entering the AZURE-2 global Phase 3 trial. The company also advanced a proprietary TLR9 agonist
  (cavrotolimod), a liver-targeted HBV transcript inhibitor (BJT-628) and a liver-targeted fatty acid synthase inhibitor (BJT-188)
  toward a combination regimen aimed at functional cure of chronic hepatitis B. Mirum Pharmaceuticals agreed to acquire Bluejay
  Therapeutics in December 2025 and completed the acquisition on 26 January 2026; the corporate site now serves a single acquisition
  notice redirecting readers to mirumpharma.com. Bluejay Therapeutics never ran a developer program — no product API, no developer
  portal, no API documentation, no SDKs, no GitHub organisation and no package-registry presence. The only machine-readable
  surface reachable without credentials is the WordPress REST content API behind bluejaytx.com, catalogued here. That surface
  is notable for outliving the web site it belongs to: the marketing page tree was deleted in the teardown, but the REST API
  and the post archive still serve all 35 press releases and publication notices from 2021 through 2025 with full text.'
url: https://raw.githubusercontent.com/api-evangelist/bluejay-therapeutics/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enriched
specificationVersion: '0.23'
created: '2026-08-07'
modified: '2026-08-07'
tags:
- Company
- Biopharmaceutical
- Pharmaceuticals
- Life Sciences
- hepatology
- Infectious Disease
- Clinical Trials
- Drug Development
- Monoclonal Antibodies
- content-api
tags_raw:
- Company
- biopharmaceuticals
- pharmaceuticals
- life-sciences
- hepatology
- infectious-disease
- clinical-trials
- drug-development
- monoclonal-antibodies
- content-api
apis:
- aid: bluejay-therapeutics:bluejaytx-com-website-wordpress-rest
  name: Bluejay Therapeutics Website (WordPress REST)
  description: 'The public WordPress REST API (wp-json) of the Bluejay Therapeutics website at bluejaytx.com: the route index
    of the site''s content management system, catalogued as one site surface rather than as separate APIs.'
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - WordPress
  x-surface: platform-generated
  properties:
  - type: Documentation
    url: https://bluejaytx.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: CapabilityMap
  url: capabilities/bluejay-therapeutics-capability-edges.yml
  name: Bluejay Therapeutics Business Capability Map
- type: Overlay
  url: overlays/bluejay-therapeutics-content-overlay.yaml
- type: Website
  url: https://bluejaytx.com/
- type: Blog
  url: https://bluejaytx.com/category/press-releases/
- type: BlogRSS
  url: https://bluejaytx.com/feed/
- type: Publications
  url: https://bluejaytx.com/category/publication/
- type: Sitemap
  url: https://bluejaytx.com/sitemap.xml
- type: LinkedIn
  url: https://www.linkedin.com/company/bluejay-therapeutics/
- type: Acquirer
  url: https://mirumpharma.com/
- type: SecondaryMarket
  url: https://forgeglobal.com/bluejay-therapeutics_stock/
- type: Authentication
  url: authentication/bluejay-therapeutics-authentication.yml
- type: Conventions
  url: conventions/bluejay-therapeutics-conventions.yml
- type: Conformance
  url: conformance/bluejay-therapeutics-conformance.yml
- type: ErrorCatalog
  url: errors/bluejay-therapeutics-problem-types.yml
- type: Lifecycle
  url: lifecycle/bluejay-therapeutics-lifecycle.yml
- type: DataModel
  url: data-model/bluejay-therapeutics-data-model.yml
- type: JSONLD
  url: json-ld/bluejay-therapeutics-json-ld.yml
- type: WellKnown
  url: well-known/bluejay-therapeutics-well-known.yml
- type: DomainSecurity
  url: security/bluejay-therapeutics-domain-security.yml
- type: LLMsTxt
  url: llms/bluejay-therapeutics-llms.txt
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-08-07'
  status: enriched
  artifacts_added: 14
  pass: local-v1

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