Twelve

Twelve is a carbon transformation company that converts CO2, water, and renewable electricity into fuels and chemicals that serve as drop-in replacements for petroleum-based products. Its proprietary eManufacturing technology powers AirPlant One in Moses Lake, Washington, which produces E-Jet sustainable aviation fuel and E-Naphtha, while its eMade program partners with consumer brands on CO2-made materials. Investors include TPG, DCVC, Microsoft, Carbon Direct, Breakout Ventures, and the Chan Zuckerberg Initiative. Twelve publishes no public developer API, but its Wix-hosted site exposes an llms.txt and a live site MCP endpoint for agentic access.

Twelve is profiled on the APIs.io network. Tagged areas include Company, Carbon Transformation, Climate Tech, Sustainable Aviation Fuel, and Chemicals.

Twelve’s developer surface includes engineering blog, support, and 6 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

11.2/100 emerging ▬ flat Agent 2/100 human only Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 MCP Servers

CompanyCarbon TransformationClimate Tech Sustainable Aviation Fuel Chemicals Clean Energy Manufacturing

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 11.2/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.2 / 17

Access Clarity 3.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.0 / 9

Regulatory Posture 1.7 / 15

Agent readiness — 2/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Energy & Utilities 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.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 7.1 — up to +18.6 composite points
Access Clarity scores 21.1 — up to +15.8 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/twelve/apis.yml: open an issue on github.com/api-evangelist/twelve to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (platform)

Universal Commerce Protocol (UCP)

measured — observed by APIs.io (wix)

MCP Servers 1

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

Site Visitor Assistant for site "Twelve | A World Made from Air"

Remote MCP server at www.twelve.co over HTTP; 10 tools listed.

MCP SERVER

Security Posture 1

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

Twelve Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

TermsOfService

TermsOfService

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: twelve
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/twelve.png
name: Twelve
description: Twelve is a carbon transformation company that converts CO2, water, and renewable electricity into fuels and
  chemicals that serve as drop-in replacements for petroleum-based products. Its proprietary eManufacturing technology powers
  AirPlant One in Moses Lake, Washington, which produces E-Jet sustainable aviation fuel and E-Naphtha, while its eMade program
  partners with consumer brands on CO2-made materials. Investors include TPG, DCVC, Microsoft, Carbon Direct, Breakout Ventures,
  and the Chan Zuckerberg Initiative. Twelve publishes no public developer API, but its Wix-hosted site exposes an llms.txt
  and a live site MCP endpoint for agentic access.
url: https://raw.githubusercontent.com/api-evangelist/twelve/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- dcvc
- techstars
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Carbon Transformation
- Climate Tech
- Sustainable Aviation Fuel
- Chemicals
- Clean Energy
- Manufacturing
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.twelve.co/
- type: Blog
  url: https://www.twelve.co/catalyst
- type: Support
  url: https://www.twelve.co/contact
- type: PrivacyPolicy
  url: https://www.twelve.co/privacypolicy
- type: TermsOfService
  url: https://www.twelve.co/termsofservice
- type: MCPServer
  url: mcp/twelve-mcp.yml
- type: LLMsTxt
  url: llms/twelve-llms.txt
- type: DomainSecurity
  url: security/twelve-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 4
  pass: local-v1

Twelve API — frequently asked questions

Does Twelve have an MCP server?

Yes. APIs.io lists 1 MCP server for Twelve: Remote MCP server at www.twelve.co over HTTP; 10 tools listed.

Is the Twelve API ready for AI agents?

Twelve has a Kin Score of 11.2 out of 100 (emerging) and an Agent Readiness score of 2.2 (human-only), scored by API Evangelist on 2026-11-06.

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MCP server

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
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find_cohortsEvery scored population of providers in the catalog.

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