# Day One Biopharmaceuticals

**Canonical:** https://apis.io/providers/day-one-biopharmaceuticals/  
**Website:** https://www.dayonebio.com  
**APIs profiled:** 0

Day One Biopharmaceuticals is a commercial-stage biopharmaceutical company developing and commercializing targeted therapies for people of all ages living with life-threatening diseases, with an initial focus on pediatric and rare cancers. Its lead product OJEMDA (tovorafenib) is an FDA-approved treatment for relapsed or refractory pediatric low-grade glioma, and its pipeline includes DAY301 and the antibody-drug conjugate Emi-Le. Headquartered in Brisbane, California, the company was acquired by and is now part of the Servier Group as of March 2026. Day One was surfaced as a portfolio company of Canaan Partners and added to the API Evangelist network; it maintains a corporate and investor-relations web presence but publishes no public developer API, SDK, or programmatic surface.

## Kin Score — 10.7 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 10.7).

| Facet | Score |
|---|---|
| Discoverability | 57.4 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 4.8 |
| Commercial Clarity | 21.1 |
| Access Clarity | 21.1 |

Regulatory layer — **Health**: 17.5 (matched via tags).

## 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)

- **Day One Biopharmaceuticals Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Biopharmaceutical, Oncology, Pediatric Cancer, Rare Disease, Pharmaceuticals, Biotechnology, Life Sciences, Servier Group

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