Capstan Therapeutics
Capstan Therapeutics was a clinical-stage biotechnology company based in San Diego, California, developing in vivo cell engineering medicines built on a proprietary targeted lipid nanoparticle (tLNP) platform that delivers mRNA and other RNA payloads to specific cell types inside the body. Its lead candidate CPTX2309 is an anti-CD19 in vivo CAR-T therapy in Phase 1 for B cell-mediated autoimmune disease, intended to achieve deep B cell depletion without lymphodepleting chemotherapy. AbbVie completed its acquisition of Capstan on 19 August 2025 for up to $2.1 billion. The company's own domain now redirects to AbbVie and its DNS is served by AbbVie nameservers; it operates no developer program, public API, SDK, or machine-readable specification.
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.
Capstan Therapeutics is tracked in the API Evangelist network. This page is the human-readable profile that sits on top of the machine-readable index we maintain at apis.io.
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 — Capstan Therapeutics scores 3.9/100 (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.
Why this profile is thin
Capstan's own site is gone: capstantx.com 301s to www.abbvie.com/capstan-therapeutics.html and its nameservers are now ns1-4.abbviedns.com, following AbbVie's completed acquisition on 19 August 2025 — the company was a clinical-stage biotech that never operated a developer program, GitHub org, or public API.
This is an honest zero, not a gap in our research. Capstan Therapeutics does not appear to expose an API, so there is nothing here for us to index and nothing for them to fix.
What we probed
https://capstantx.com/→ HTTP 301https://www.capstantx.com/→ HTTP 301https://capstantx.com/.well-known/agent-card.json→ HTTP 403https://capstantx.com/openapi.json→ HTTP 403https://api.github.com/orgs/capstantx→ HTTP 404
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 2026-08-17 · rubric v0.11.0
Put this on your own site. The badge is drawn live from Capstan Therapeutics's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/capstan-therapeutics/"
title="Capstan Therapeutics on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/capstan-therapeutics.svg"
alt="Capstan Therapeutics Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/capstan-therapeutics/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/capstan-therapeutics/"
title="Capstan Therapeutics on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/capstan-therapeutics/card.svg"
alt="Capstan Therapeutics Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
Resources
Every other property we hold for Capstan Therapeutics — 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.
Company 1
The organization behind the API
Capstan Therapeutics is in the network as a tracked entity. We haven't yet indexed a public API surface for it — when one is published, the artifacts, score, and agent-readiness read will appear here automatically. The source repository is where that profile is built.
← All providers · Data indexed from github.com/api-evangelist/capstan-therapeutics · machine-readable index on apis.io
This is an independent, third-party profile of Capstan Therapeutics, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.