Calixa Therapeutics

Calixa Therapeutics was a privately held, San Diego-based biopharmaceutical company focused on developing antibiotics to treat serious infections caused by multi-drug-resistant Gram-negative bacterial pathogens. Its lead compound, CXA-201 (later ceftolozane/tazobactam), was an intravenous therapy for serious hospital-acquired Gram-negative infections. Calixa was acquired by Cubist Pharmaceuticals in December 2009 for approximately $92.5 million (plus up to $310 million in milestone payments) and no longer operates as an independent company. It has no public developer or API surface. This profile exists in the API Evangelist network as a portfolio-lead stub associated with canaan-partners; there are no API artifacts to enrich because it is a defunct pharmaceutical company, not an API provider.

Calixa Therapeutics is profiled on the APIs.io network. Tagged areas include Company, Pharmaceuticals, Biotechnology, Antibiotics, and Anti-Infectives.

📡 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 Pharmaceuticals Biotechnology Antibiotics Anti-Infectives Drug Development Life Sciences Healthcare Acquired

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/calixa-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 →

Source (apis.yml)

aid: calixa-therapeutics
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: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/calixa-therapeutics.png
name: Calixa Therapeutics
description: Calixa Therapeutics was a privately held, San Diego-based biopharmaceutical company focused on developing antibiotics
  to treat serious infections caused by multi-drug-resistant Gram-negative bacterial pathogens. Its lead compound, CXA-201
  (later ceftolozane/tazobactam), was an intravenous therapy for serious hospital-acquired Gram-negative infections. Calixa
  was acquired by Cubist Pharmaceuticals in December 2009 for approximately $92.5 million (plus up to $310 million in milestone
  payments) and no longer operates as an independent company. It has no public developer or API surface. This profile exists
  in the API Evangelist network as a portfolio-lead stub associated with canaan-partners; there are no API artifacts to enrich
  because it is a defunct pharmaceutical company, not an API provider.
url: https://raw.githubusercontent.com/api-evangelist/calixa-therapeutics/refs/heads/main/apis.yml
x-api-posture: no-product-api
x-api-posture-basis: observed
x-type: company
x-source: vc-portfolio
x-backed-by:
- canaan-partners
x-tier: stub
x-tier-reason: portfolio-lead
x-status: acquired
x-status-note: Acquired by Cubist Pharmaceuticals in December 2009; not an independent operating company and has no public
  API surface.
x-acquired-by: cubist-pharmaceuticals
x-acquired-date: '2009-12-16'
x-industry: pharmaceuticals
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Pharmaceuticals
- Biotechnology
- Antibiotics
- Anti-Infectives
- Drug Development
- Life Sciences
- Healthcare
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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