TRexBio

TRexBio, Inc. is a clinical-stage biotechnology company headquartered at 681 Gateway Blvd in South San Francisco, California, founded in 2018 and seed funded by SV Health Investors, that discovers and develops immunoregulatory biologics based on tissue regulatory T cell (Treg) biology. Its Deep Biology Platform combines human tissue samples, computational biology and immunobiology expertise to map how tissue Tregs behave in disease and to identify and characterize novel targets for inflammatory, autoimmune and other immune-mediated conditions. Disclosed programs include TRB-061, the CD30 agonist TRB-071, TRB-081, and the Lilly-partnered TRB-051, with Phase 1 trials expected to initiate in 2027. The company announced an $84 million Series B in November 2024 and closed a further $50 million financing in January 2026; investors include Eli Lilly and Company, Pfizer Ventures, Johnson & Johnson, SV Health Investors and Polaris Partners. TRexBio publishes no developer program, API documentation, SDK or machine-readable API contract. trex.bio is a WordPress marketing site whose only machine-readable surfaces are the WordPress core REST API, a Yoast-generated llms.txt, and an OAuth-protected WordPress MCP adapter endpoint — CMS infrastructure rather than a product API.

TRexBio is profiled on the APIs.io network. Tagged areas include Company, Biotechnology, Life Sciences, Pharmaceuticals, and Immunology.

TRexBio’s developer surface includes engineering blog and 18 more developer resources.

🌐 Visit website 📡 Source on GitHub
13.5/100 emerging ▬ flat Agent 11/100 agent aware Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0
0 APIs 1 MCP Servers
CompanyBiotechnologyLife SciencesPharmaceuticalsImmunologyDrug DiscoveryRegulatory T CellsClinical StageComputational BiologyTherapeuticsSouth San Francisco

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0
Composite quality — 13.5/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 1.9 / 17
Commercial Clarity 3.6 / 17
Operational Transparency 0.6 / 11
Governance 0.0 / 10
Discoverability 4.9 / 9
Regulatory Posture 2.6 / 15
Agent readiness — 11/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Regulatory Posture applies to this provider. Its tags matched the Health regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/trexbio: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

trexbio-mcp.yml

MCP SERVER

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Trexbio Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Contact
Contact

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 7

The organization behind the API

Website
Website
 About
About
 Blog
Blog
 BlogFeeds
BlogFeeds
 Careers
Careers
 LinkedIn
LinkedIn
 Investors
Investors

Scroll for all 7

Other 4

Properties that don't map to a standard resource type

Platform
Platform
 Pipeline
Pipeline
 Research
Research
 CookiePolicy
CookiePolicy

Source (apis.yml)

apis.yml Raw ↑ 
aid: trexbio
name: TRexBio
description: TRexBio, Inc. is a clinical-stage biotechnology company headquartered at 681 Gateway Blvd in South San Francisco,
  California, founded in 2018 and seed funded by SV Health Investors, that discovers and develops immunoregulatory biologics
  based on tissue regulatory T cell (Treg) biology. Its Deep Biology Platform combines human tissue samples, computational
  biology and immunobiology expertise to map how tissue Tregs behave in disease and to identify and characterize novel targets
  for inflammatory, autoimmune and other immune-mediated conditions. Disclosed programs include TRB-061, the CD30 agonist
  TRB-071, TRB-081, and the Lilly-partnered TRB-051, with Phase 1 trials expected to initiate in 2027. The company announced
  an $84 million Series B in November 2024 and closed a further $50 million financing in January 2026; investors include Eli
  Lilly and Company, Pfizer Ventures, Johnson & Johnson, SV Health Investors and Polaris Partners. TRexBio publishes no developer
  program, API documentation, SDK or machine-readable API contract. trex.bio is a WordPress marketing site whose only machine-readable
  surfaces are the WordPress core REST API, a Yoast-generated llms.txt, and an OAuth-protected WordPress MCP adapter endpoint
  — CMS infrastructure rather than a product API.
image: https://trex.bio/wp-content/uploads/2025/10/cropped-Group-3.png
url: https://raw.githubusercontent.com/api-evangelist/trexbio/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profile
x-tier-reason: no-api-surface
specificationVersion: '0.20'
created: '2026-08-05'
modified: '2026-08-05'
tags:
- Company
- Biotechnology
- Life Sciences
- Pharmaceuticals
- Immunology
- Drug Discovery
- Regulatory T Cells
- Clinical Stage
- Computational Biology
- Therapeutics
- South San Francisco
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: MCPServer
  url: mcp/trexbio-mcp.yml
- type: Website
  url: https://trex.bio/
- type: About
  url: https://trex.bio/about-trex-bio/
- type: Platform
  url: https://trex.bio/deep-biology-platform/
- type: Pipeline
  url: https://trex.bio/pipeline/
- type: Blog
  url: https://trex.bio/news/
- type: BlogFeeds
  url: https://trex.bio/feed/
- type: Research
  url: https://trex.bio/news/
- type: Careers
  url: https://trex.bio/careers/
- type: Contact
  url: https://trex.bio/contact-us/
- type: TermsOfService
  url: https://trex.bio/terms-of-use/
- type: PrivacyPolicy
  url: https://trex.bio/privacy-policy/
- type: CookiePolicy
  url: https://trex.bio/cookie-policy/
- type: LinkedIn
  url: https://www.linkedin.com/company/trexbio-inc/
- type: GitHubOrganization
  url: https://github.com/trexbio
- type: Investors
  url: https://forgeglobal.com/trexbio_stock/
- type: LLMsTxt
  url: llms/trexbio-llms.txt
- type: WellKnown
  url: well-known/trexbio-well-known.yml
- type: DomainSecurity
  url: security/trexbio-domain-security.yml
x-enrichment:
  date: '2026-08-05'
  status: minimal
  artifacts_added: 6
  pass: local-v1
x-coverage:
  state: none
  reason: no-developer-program
  detail: 'TRexBio is a clinical-stage Treg biologics company with no developer program at all — trex.bio is a WordPress/WP
    Engine marketing site, and the only machine-readable things on it are stock CMS plumbing: the WordPress core REST API
    at /wp-json/ (342 routes, all of them WordPress and plugin routes), a Yoast-SEO-generated /llms.txt listing news posts
    and careers pages, and an undocumented WordPress MCP adapter at /wp-json/mcp/mcp-oauth-server that returns 401 mcp_unauthorized
    to anonymous tools/list — there is no product API, no /openapi.json, no docs host, and github.com/trexbio has zero public
    repositories.'
  evidence:
  - url: https://trex.bio/openapi.json
    status: 404
  - url: https://trex.bio/graphql
    status: 404
  - url: https://trex.bio/.well-known/agent-card.json
    status: 404
  - url: https://trex.bio/wp-json/mcp/mcp-oauth-server
    status: 401
  - url: https://trex.bio/llms.txt
    status: 200
  - url: https://api.github.com/orgs/trexbio/repos
    status: 200
  checked: '2026-08-05'