Bluejay Therapeutics website screenshot

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 6 APIs on the APIs.io network, including Content API, Discovery API, Embed API, and 3 more. Tagged areas include Company, biopharmaceuticals, 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 18 more developer resources.

🌐 Visit website 📡 Source on GitHub
26.1/100 emerging ▬ flat Agent 30/100 agent aware Full breakdown ↓
scored 2026-08-12 · rubric v0.11.0
6 APIs
Companybiopharmaceuticalspharmaceuticalslife-scienceshepatologyinfectious-diseaseclinical-trialsdrug-developmentmonoclonal-antibodiescontent-api

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-12 · rubric v0.11.0
Composite quality — 26.1/100 · emerging
Contract Quality 12.3 / 21
Developer Ergonomics 2.5 / 17
Commercial Clarity 0.0 / 17
Operational Transparency 0.0 / 11
Governance 1.2 / 10
Discoverability 6.9 / 9
Regulatory Posture 3.2 / 15
Agent readiness — 30/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
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
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/bluejay-therapeutics: 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 6

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

Bluejay Therapeutics Content API

Posts, pages and cross-content search.

Bluejay Therapeutics Discovery API

Route index and namespace discovery documents.

Bluejay Therapeutics Embed API

oEmbed 1.0 provider endpoint.

Bluejay Therapeutics Empty Collections API

Registered collections that answer 200 anonymously but currently hold no items.

Bluejay Therapeutics Media API

The site media library.

Bluejay Therapeutics Taxonomy API

Categories, tags and taxonomy/type/status registries.

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
Conventions
 Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 DataModel
DataModel
 JSONLD
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
LinkedIn

Other 5

Properties that don't map to a standard resource type

Overlay
Overlay
 Publications
Publications
 Sitemap
Sitemap
 Acquirer
Acquirer
 SecondaryMarket
SecondaryMarket

Source (apis.yml)

apis.yml Raw ↑ 
aid: bluejay-therapeutics
name: Bluejay Therapeutics
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: '0.20'
created: '2026-08-07'
modified: '2026-08-07'
tags:
- Company
- biopharmaceuticals
- pharmaceuticals
- life-sciences
- hepatology
- infectious-disease
- clinical-trials
- drug-development
- monoclonal-antibodies
- content-api
apis:
- aid: bluejay-therapeutics:bluejay-therapeutics-content-api
  name: Bluejay Therapeutics Content API
  description: Posts, pages and cross-content search.
  humanURL: https://developer.wordpress.org/rest-api/
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - content
  properties:
  - type: OpenAPI
    url: openapi/bluejay-therapeutics-content-api-openapi.yml
  - type: Authentication
    url: authentication/bluejay-therapeutics-authentication.yml
  - type: ErrorCatalog
    url: errors/bluejay-therapeutics-problem-types.yml
  - type: Conventions
    url: conventions/bluejay-therapeutics-conventions.yml
  - type: DataModel
    url: data-model/bluejay-therapeutics-data-model.yml
  - type: JSONLD
    url: json-ld/bluejay-therapeutics-json-ld.yml
- aid: bluejay-therapeutics:bluejay-therapeutics-discovery-api
  name: Bluejay Therapeutics Discovery API
  description: Route index and namespace discovery documents.
  humanURL: https://developer.wordpress.org/rest-api/
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - discovery
  properties:
  - type: OpenAPI
    url: openapi/bluejay-therapeutics-discovery-api-openapi.yml
  - type: Authentication
    url: authentication/bluejay-therapeutics-authentication.yml
  - type: ErrorCatalog
    url: errors/bluejay-therapeutics-problem-types.yml
  - type: Conventions
    url: conventions/bluejay-therapeutics-conventions.yml
  - type: DataModel
    url: data-model/bluejay-therapeutics-data-model.yml
  - type: JSONLD
    url: json-ld/bluejay-therapeutics-json-ld.yml
- aid: bluejay-therapeutics:bluejay-therapeutics-embed-api
  name: Bluejay Therapeutics Embed API
  description: oEmbed 1.0 provider endpoint.
  humanURL: https://developer.wordpress.org/rest-api/
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - embed
  properties:
  - type: OpenAPI
    url: openapi/bluejay-therapeutics-embed-api-openapi.yml
  - type: Authentication
    url: authentication/bluejay-therapeutics-authentication.yml
  - type: ErrorCatalog
    url: errors/bluejay-therapeutics-problem-types.yml
  - type: Conventions
    url: conventions/bluejay-therapeutics-conventions.yml
  - type: DataModel
    url: data-model/bluejay-therapeutics-data-model.yml
  - type: JSONLD
    url: json-ld/bluejay-therapeutics-json-ld.yml
- aid: bluejay-therapeutics:bluejay-therapeutics-empty-collections-api
  name: Bluejay Therapeutics Empty Collections API
  description: Registered collections that answer 200 anonymously but currently hold no items.
  humanURL: https://developer.wordpress.org/rest-api/
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - empty-collections
  properties:
  - type: OpenAPI
    url: openapi/bluejay-therapeutics-empty-collections-api-openapi.yml
  - type: Authentication
    url: authentication/bluejay-therapeutics-authentication.yml
  - type: ErrorCatalog
    url: errors/bluejay-therapeutics-problem-types.yml
  - type: Conventions
    url: conventions/bluejay-therapeutics-conventions.yml
  - type: DataModel
    url: data-model/bluejay-therapeutics-data-model.yml
  - type: JSONLD
    url: json-ld/bluejay-therapeutics-json-ld.yml
- aid: bluejay-therapeutics:bluejay-therapeutics-media-api
  name: Bluejay Therapeutics Media API
  description: The site media library.
  humanURL: https://developer.wordpress.org/rest-api/
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - media
  properties:
  - type: OpenAPI
    url: openapi/bluejay-therapeutics-media-api-openapi.yml
  - type: Authentication
    url: authentication/bluejay-therapeutics-authentication.yml
  - type: ErrorCatalog
    url: errors/bluejay-therapeutics-problem-types.yml
  - type: Conventions
    url: conventions/bluejay-therapeutics-conventions.yml
  - type: DataModel
    url: data-model/bluejay-therapeutics-data-model.yml
  - type: JSONLD
    url: json-ld/bluejay-therapeutics-json-ld.yml
- aid: bluejay-therapeutics:bluejay-therapeutics-taxonomy-api
  name: Bluejay Therapeutics Taxonomy API
  description: Categories, tags and taxonomy/type/status registries.
  humanURL: https://developer.wordpress.org/rest-api/
  baseURL: https://bluejaytx.com/wp-json
  tags:
  - taxonomy
  properties:
  - type: OpenAPI
    url: openapi/bluejay-therapeutics-taxonomy-api-openapi.yml
  - type: Authentication
    url: authentication/bluejay-therapeutics-authentication.yml
  - type: ErrorCatalog
    url: errors/bluejay-therapeutics-problem-types.yml
  - type: Conventions
    url: conventions/bluejay-therapeutics-conventions.yml
  - type: DataModel
    url: data-model/bluejay-therapeutics-data-model.yml
  - type: JSONLD
    url: json-ld/bluejay-therapeutics-json-ld.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- 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