Fable Therapeutics

Fable Therapeutics is a biopharmaceutical company developing protein-engineered biologics for obesity and metabolic disease. Its lead candidate, FBL-140, is an infrequently dosed monoclonal antibody antagonizing the activin receptor type II (ActR2) pathway to reduce body weight and fat while preserving lean muscle mass and improving cardiometabolic health, with clinical trials expected to begin in early 2027. The company is also advancing a combination therapy pairing ActR2 antagonism with an incretin mimetic. Fable Therapeutics is a deep-tech portfolio company backed by DCVC. It operates as a traditional drug-development company and does not currently publish any public API, developer documentation, or technical platform.

Fable Therapeutics is profiled on the APIs.io network. Tagged areas include Company, Biotechnology, Pharmaceuticals, Therapeutics, and Obesity.

🌐 Visit website 📡 Source on GitHub

6.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyBiotechnologyPharmaceuticalsTherapeuticsObesityMetabolic DiseaseDrug DiscoveryProtein EngineeringBiologics

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 6.8/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

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Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: fable-therapeutics
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/fable-therapeutics.png
name: Fable Therapeutics
description: Fable Therapeutics is a biopharmaceutical company developing protein-engineered biologics for obesity and metabolic
  disease. Its lead candidate, FBL-140, is an infrequently dosed monoclonal antibody antagonizing the activin receptor type
  II (ActR2) pathway to reduce body weight and fat while preserving lean muscle mass and improving cardiometabolic health,
  with clinical trials expected to begin in early 2027. The company is also advancing a combination therapy pairing ActR2
  antagonism with an incretin mimetic. Fable Therapeutics is a deep-tech portfolio company backed by DCVC. It operates as
  a traditional drug-development company and does not currently publish any public API, developer documentation, or technical
  platform.
url: https://raw.githubusercontent.com/api-evangelist/fable-therapeutics/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- dcvc
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Biotechnology
- Pharmaceuticals
- Therapeutics
- Obesity
- Metabolic Disease
- Drug Discovery
- Protein Engineering
- Biologics
apis: []
common:
- type: DomainSecurity
  url: security/fable-therapeutics-domain-security.yml
- type: Website
  url: https://fabletherapeutics.com
  name: Fable Therapeutics
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

Fable Therapeutics

Kin Score

Security Posture 1

Fable Therapeutics Domain Security

Resources

Access & Security 1

Company 1

Source (apis.yml)