# Fable Therapeutics

**Canonical:** https://apis.io/providers/fable-therapeutics/  
**Website:** https://fabletherapeutics.com  
**APIs profiled:** 0

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.

## Kin Score — 5.0 / 100 (minimal)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 5.0).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Fable Therapeutics Domain Security** — TLSv1.3 · HSTS

## Tags

Company, Biotechnology, Pharmaceuticals, Therapeutics, Obesity, Metabolic Disease, Drug Discovery, Protein Engineering, Biologics

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/fable-therapeutics/). Scores are computed from the provider's own public artifacts under a published rubric.