CNaught

CNaught provides a science‑backed platform that helps businesses purchase, manage and retire high‑integrity carbon credits. Their API enables integration of carbon‑credit portfolios, access to Energy Attribute Certificates, and tools for emissions calculations, aiming to simplify climate impact for companies of any size.

CNaught is listed with 3 APIs on the APIs.io network: CNaught API, Orders API, and Subaccounts API. Tagged areas include Company, Climate, Carbon Credits, and Sustainability.

The CNaught catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

CNaught’s developer surface includes changelog, authentication, documentation, API reference, getting-started guide, engineering blog, pricing, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.9/100 thin ▼ -9.7 Agent 28/100 agent aware Heartbeat 65/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

3 APIs

Company Climate Carbon Credits Sustainability

Kin Score

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

Composite quality — 34.9/100 · thin

Contract Quality 4.5 / 19

Developer Ergonomics 5.5 / 15

Access Clarity 7.1 / 15

Operational Transparency 1.8 / 10

Contract Governance 2.0 / 9

Discoverability 5.2 / 8

Regulatory Posture 3.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 0 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 23.8 — up to +19.1 composite points
Developer Ergonomics scores 36.9 — up to +12.6 composite points
Operational Transparency scores 18.4 — up to +10.6 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/cnaught/apis.yml: open an issue on github.com/api-evangelist/cnaught 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

CNaught CNaught API

The CNaught API API from CNaught — 2 operation(s) for cnaught api.

CNaught Orders API

The Orders API from CNaught — 2 operation(s) for orders.

CNaught Subaccounts API

The Subaccounts API from CNaught — 1 operation(s) for subaccounts.

CNaught API pricing

Prices published by CNaught, read 2026-10-09 from www.cnaught.com/pricing.

Plan	Price
Standard	$12–20/ tonne
Custom	Talk to us
API	free

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Cnaught Plans Pricing

3 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

CNaught

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Cnaught Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Cnaught Context

7 classes · 9 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

CNaught API Rules

11 rules · 9 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

DeleteV1SubaccountsIdResponse

2 properties

JSON SCHEMA

GetV1V1IdIdResponse

2 properties

JSON SCHEMA

GetV1V1IdResponse

2 properties

JSON SCHEMA

PostV1OrdersIdCancelResponse

6 properties

JSON SCHEMA

PostV1OrdersIdResponse

2 properties

JSON SCHEMA

PostV1V1IdRequest

4 properties

JSON SCHEMA

Security Posture 2

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

Cnaught Authentication

1 scheme

SECURITY

Cnaught Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Idempotency

Conventions

Conformance

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

ChangeLog

StatusPage

ChangeLog

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: cnaught
name: CNaught
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://www.cnaught.com/api/og?title=Carbon credits you can trust
description: CNaught provides a science‑backed platform that helps businesses purchase, manage and retire high‑integrity carbon
  credits. Their API enables integration of carbon‑credit portfolios, access to Energy Attribute Certificates, and tools for
  emissions calculations, aiming to simplify climate impact for companies of any size.
url: https://raw.githubusercontent.com/api-evangelist/cnaught/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-09 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-09'
modified: '2026-10-09'
tags:
- Company
- Climate
- Carbon Credits
- Sustainability
tags_raw:
- Company
- Climate
- CarbonCredits
- API
- Sustainability
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/cnaught-plans-pricing.yml
- type: Spectral
  url: rules/cnaught-rules.yml
- type: JSONLD
  url: json-ld/cnaught-context.jsonld
- type: Vocabulary
  url: vocabulary/cnaught-vocabulary.yml
- type: DataModel
  url: data-model/cnaught-data-model.yml
- type: ChangeLog
  url: changelog/cnaught-changelog.yml
- type: Idempotency
  url: conventions/cnaught-conventions.yml
- type: Conventions
  url: conventions/cnaught-conventions.yml
- type: Authentication
  url: authentication/cnaught-authentication.yml
- type: Conformance
  url: conformance/cnaught-conformance.yml
- type: LLMsTxt
  url: llms/cnaught-llms.txt
- type: Hosts
  url: hosts/cnaught-hosts.yml
- type: Vendors
  url: vendors/cnaught-vendors.yml
- type: SDKs
  url: packages/cnaught-packages.yml
- type: Packages
  url: packages/cnaught-packages.yml
- type: TermsOfService
  url: https://www.cnaught.com/terms
- type: StatusPage
  url: https://status.cnaught.com/
- type: PrivacyPolicy
  url: https://www.cnaught.com/privacy
- type: GitHubOrganization
  url: https://github.com/cnaught-inc
- type: ChangeLog
  url: https://docs.cnaught.com/changelog
- type: DomainSecurity
  url: security/cnaught-domain-security.yml
- type: Website
  url: https://www.cnaught.com/
- type: Documentation
  url: https://docs.cnaught.com/
- type: APIReference
  url: https://docs.cnaught.com/api-reference/introduction
- type: GettingStarted
  url: https://docs.cnaught.com/quickstart
- type: Blog
  url: https://www.cnaught.com/blog
- type: Pricing
  url: https://www.cnaught.com/pricing
- type: Support
  url: https://www.cnaught.com/contact-sales
apis:
- aid: cnaught:cnaught-cnaught-api-api
  name: CNaught CNaught API
  description: The CNaught API API from CNaught — 2 operation(s) for cnaught api.
  humanURL: https://docs.cnaught.com/api-reference/orders/cancel-order.md
  baseURL: https://api.cnaught.com
  tags:
  - CNaught API
  properties:
  - type: OpenAPI
    url: openapi/cnaught-cnaught-api-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-orders-id-cancel-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-v1-id-request-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-delete-v1-subaccounts-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-get-v1-v1-id-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-get-v1-v1-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-orders-id-response-schema.json
- aid: cnaught:cnaught-orders-api
  name: CNaught Orders API
  description: The Orders API from CNaught — 2 operation(s) for orders.
  humanURL: https://docs.cnaught.com/api-reference/orders/cancel-order.md
  baseURL: https://api.cnaught.com
  tags:
  - Order
  tags_raw:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/cnaught-orders-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-orders-id-cancel-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-v1-id-request-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-delete-v1-subaccounts-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-get-v1-v1-id-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-get-v1-v1-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-orders-id-response-schema.json
- aid: cnaught:cnaught-subaccounts-api
  name: CNaught Subaccounts API
  description: The Subaccounts API from CNaught — 1 operation(s) for subaccounts.
  humanURL: https://docs.cnaught.com/api-reference/orders/cancel-order.md
  baseURL: https://api.cnaught.com
  tags:
  - Subaccounts
  properties:
  - type: OpenAPI
    url: openapi/cnaught-subaccounts-api-openapi.yml
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-orders-id-cancel-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-v1-id-request-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-delete-v1-subaccounts-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-get-v1-v1-id-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-get-v1-v1-id-response-schema.json
  - type: JSONSchema
    url: json-schema/cnaught-post-v1-orders-id-response-schema.json
x-enrichment:
  date: '2026-10-09'
  status: enriched
  artifacts_added: 26
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

CNaught API — frequently asked questions

Does CNaught have an API?

Yes. APIs.io lists 3 APIs from CNaught, including CNaught CNaught API, CNaught Orders API and CNaught Subaccounts API.

Is there an OpenAPI specification for the CNaught API?

Yes. APIs.io indexes 3 OpenAPI specifications for CNaught, each linked for download from this page.

How do I authenticate with the CNaught API?

CNaught uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Cnaught Authentication.

How much does the CNaught API cost?

CNaught publishes its prices; its Standard plan is $12–20/ tonne as of 2026-10-09. APIs.io lists 3 pricing plans for CNaught, with each plan's price, limits and inclusions under Pricing on this page.

Is the CNaught API ready for AI agents?

CNaught has a Kin Score of 34.9 out of 100 (thin) and an Agent Readiness score of 28.1 (agent-aware), scored by API Evangelist on 2026-11-06.

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