Aiolos Bio

Aiolos Bio was a clinical-stage biopharmaceutical company founded in 2023 with offices in San Francisco, California and London, United Kingdom, developing treatments for respiratory and inflammatory disease. Its sole disclosed asset was AIO-001, a half-life-extended monoclonal antibody against thymic stromal lymphopoietin (TSLP), positioned as a Phase 2-ready candidate for moderate-to-severe asthma with potential six-month dosing intervals. The company launched in October 2023 with an oversubscribed $245 million Series A co-led by Atlas Venture, Bain Capital Life Sciences, Forbion and Sofinnova Investments, with RA Capital Management. GSK plc agreed to acquire it on 9 January 2024 for $1 billion upfront plus up to $400 million in milestones, completing on 14 February 2024. Aiolos Bio is a drug developer, not a software vendor: it never ran a developer program, public API, SDK or machine-readable contract, and aiolosbio.com now serves a blanket HTTP 301 to www.gsk.com on every path.

Aiolos Bio is profiled on the APIs.io network. Tagged areas include Company, Biotechnology, Biopharmaceutical, Pharmaceuticals, and Drug Development.

🌐 Visit website 📡 Source on GitHub

2.9/100 minimal Agent 0/100 human only Full breakdown ↓
scored 2026-09-14 · rubric v0.22.0

0 APIs

Company Biotechnology Biopharmaceutical Pharmaceuticals Drug Development Clinical Trials Respiratory Immunology Monoclonal Antibodies Life Sciences Acquired

Kin Score

Kin Score How this is scored →
scored 2026-09-14 · rubric v0.22.0

Composite quality — 2.9/100 · 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 3.9 / 9

Regulatory Posture 1.1 / 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/aiolos-bio: 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 →

Security Posture 1

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

Aiolos Bio Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Website

Website

LinkedIn

Other 1

Properties that don't map to a standard resource type

SecondaryMarket

SecondaryMarket

Source (apis.yml)

aid: aiolos-bio
name: Aiolos Bio
description: 'Aiolos Bio was a clinical-stage biopharmaceutical company founded in 2023 with offices in San Francisco, California
  and London, United Kingdom, developing treatments for respiratory and inflammatory disease. Its sole disclosed asset was
  AIO-001, a half-life-extended monoclonal antibody against thymic stromal lymphopoietin (TSLP), positioned as a Phase 2-ready
  candidate for moderate-to-severe asthma with potential six-month dosing intervals. The company launched in October 2023
  with an oversubscribed $245 million Series A co-led by Atlas Venture, Bain Capital Life Sciences, Forbion and Sofinnova
  Investments, with RA Capital Management. GSK plc agreed to acquire it on 9 January 2024 for $1 billion upfront plus up to
  $400 million in milestones, completing on 14 February 2024. Aiolos Bio is a drug developer, not a software vendor: it never
  ran a developer program, public API, SDK or machine-readable contract, and aiolosbio.com now serves a blanket HTTP 301 to
  www.gsk.com on every path.'
url: https://raw.githubusercontent.com/api-evangelist/aiolos-bio/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-source-url: https://forgeglobal.com/aiolos-bio_stock/
x-tier: stub
x-tier-reason: harvest
specificationVersion: '0.20'
created: '2026-09-14'
modified: '2026-09-14'
tags:
- Company
- Biotechnology
- Biopharmaceutical
- Pharmaceuticals
- Drug Development
- Clinical Trials
- Respiratory
- Immunology
- Monoclonal Antibodies
- Life Sciences
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://aiolosbio.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/aiolos-bio
- type: SecondaryMarket
  url: https://forgeglobal.com/aiolos-bio_stock/
- type: DomainSecurity
  url: security/aiolos-bio-domain-security.yml
x-enrichment:
  date: '2026-09-14'
  status: minimal
  artifacts_added: 2
  pass: local-v3
x-coverage:
  state: none
  reason: defunct
  detail: Aiolos Bio was a clinical-stage asthma-antibody developer that ceased to exist as an independent company when GSK
    completed its acquisition on 2024-02-14, and its domain aiolosbio.com now answers every path — including /.well-known/security.txt,
    /openapi.json and /llms.txt — with a blanket HTTP 301 to https://www.gsk.com/, while api., docs., developer. and portal.aiolosbio.com
    are all NXDOMAIN, so there is no surviving host, developer program or contract to profile.
  evidence:
  - url: https://aiolosbio.com/.well-known/security.txt
    status: 301
  - url: https://aiolosbio.com/openapi.json
    status: 301
  - url: https://www.gsk.com/en-gb/media/press-releases/gsk-completes-acquisition-of-aiolos-bio/
    status: 200
  - url: https://forgeglobal.com/aiolos-bio_stock/
    status: 403
  checked: '2026-09-14'

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