HilleVax

HilleVax was a clinical-stage biopharmaceutical company focused on developing and commercializing novel vaccines, most notably HIL-214, a virus-like-particle based vaccine candidate aimed at preventing moderate-to-severe acute gastroenteritis caused by norovirus infection. The company was surfaced in the API Evangelist network as a portfolio company of Lightspeed Venture Partners. Enrichment probing found no developer program, no API, no developer portal, and no public API documentation of any kind, which is expected for a clinical-stage vaccine developer rather than a technology/API producer. The company's primary domain (hillevax.com) now redirects to xoma.com (XOMA Royalty), indicating HilleVax has been acquired and wound down as an independent operating company; XOMA Royalty itself was subsequently acquired by Ligand (closed July 2026). This profile is retained as a company/identity record with no API surface.

HilleVax is profiled on the APIs.io network. Tagged areas include Company, Biopharmaceutical, Vaccines, Life Sciences, and Healthcare.

🌐 Visit website 📡 Source on GitHub

2.2/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company Biopharmaceutical Vaccines Life Sciences HealthcareNorovirusClinical Stage

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 2.2/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 0.0 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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/hillevax: 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 →

Resources

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: hillevax
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - url: https://www.hillevax.com
    status: 301
    note: declared website redirects to https://xoma.com/ — a different registrable domain (hillevax.com -> xoma.com), possible
      rename or acquisition (probed 2026-09-03, roadmap#169)
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/hillevax.png
name: HilleVax
description: HilleVax was a clinical-stage biopharmaceutical company focused on developing and commercializing novel vaccines,
  most notably HIL-214, a virus-like-particle based vaccine candidate aimed at preventing moderate-to-severe acute gastroenteritis
  caused by norovirus infection. The company was surfaced in the API Evangelist network as a portfolio company of Lightspeed
  Venture Partners. Enrichment probing found no developer program, no API, no developer portal, and no public API documentation
  of any kind, which is expected for a clinical-stage vaccine developer rather than a technology/API producer. The company's
  primary domain (hillevax.com) now redirects to xoma.com (XOMA Royalty), indicating HilleVax has been acquired and wound
  down as an independent operating company; XOMA Royalty itself was subsequently acquired by Ligand (closed July 2026). This
  profile is retained as a company/identity record with no API surface.
url: https://raw.githubusercontent.com/api-evangelist/hillevax/refs/heads/main/apis.yml
x-api-posture: no-product-api
x-api-posture-basis: observed
x-api-posture-note: Enrichment probing found no developer program, no API, no developer portal, and no public API documentation
  of any kind, which is expected for a clinical-stage vaccine developer rather than a technolo
x-type: company
x-source: vc-portfolio
x-backed-by:
- lightspeed-venture-partners
x-tier: stub
x-tier-reason: no-api-surface
x-status: acquired
x-acquisition-note: hillevax.com redirects to xoma.com (XOMA Royalty); no developer/API surface exists.
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Biopharmaceutical
- Vaccines
- Life Sciences
- Healthcare
- Norovirus
- Clinical Stage
common:
- type: Website
  url: https://www.hillevax.com
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: nochange
  artifacts_added: 0
  pass: local-v1

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