Leyden Labs
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.
Index entry only — little beyond a description and a link, and nothing machine-readable enough for an agent to act on without a human reading the site first.
API Evangelist profiles Leyden Labs the way a machine reads it — 1 machine-readable artifact, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Leyden Labs scores 11.2/100 (minimal), with a separate agent-readiness read of 0/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Leyden Labs
Each block below is one kind of artifact we hold for Leyden Labs. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Leyden Labs — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Access & Security 1
Authentication, authorization, and security posture
Learn 1
Tutorials, courses, talks, and written guidance
Operate 1
Status, limits, changes, and where to get help
Commercial 1
Pricing, plans, and the legal terms of use
Company 5
The organization behind the API
Other 2
Properties that don't map to a standard resource type
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