# Leyden Labs

**Canonical:** https://apis.io/providers/leyden-labs/  
**Website:** https://leydenlabs.com  
**APIs profiled:** 0

Leyden Labs is a clinical-stage biotechnology company headquartered in Leiden, The Netherlands, with a regional office in Singapore, developing intranasal antibody products that protect people against known and newly emerging respiratory viruses. Its approach pairs mucosal immunity — delivering antibodies directly into the nasal passages, the gateway respiratory viruses use to enter the body — with broad protection, by targeting conserved regions of viral proteins so a single product can cover circulating strains and future variants. Its lead program, PanFlu, is an intranasal antibody candidate in clinical trials derived from CR9114, among the most broadly neutralizing influenza antibodies identified to date. Founded in 2021 by Koenraad Wiedhaup and Ronald Brus with founding scientist Jaap Goudsmit, the company is backed by GV and the SoftBank Vision Fund alongside the European Innovation Council Fund, the European Investment Bank and Invest-NL. Leyden Labs publishes no public developer program, API, or SDK; this profile captures its public web, security and identity surface for the API Evangelist network.

## Kin Score — 7.4 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 7.4).

| Facet | Score |
|---|---|
| Discoverability | 57.4 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 2.4 |
| Commercial Clarity | 10.5 |
| Access Clarity | 10.5 |

Regulatory layer — **Health**: 12.5 (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)

- **Leyden Labs Domain Security** — TLSv1.3 · DMARC

## Tags

Company, Life Sciences, Biotechnology, Pharmaceuticals, Immunology, Infectious Disease, Vaccines, Antibodies, Respiratory Health, Clinical Trials, Netherlands

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