Carbone

Carbone is a document generation engine that uses Word, Excel, PowerPoint and ODF templates with JSON data to produce PDFs or office documents. The Carbone HTTP API offers a template-then-render workflow with both cloud (api.carbone.io) and on-prem deployments. The Carbone JS rendering engine is open-source and embeddable.

Carbone publishes 6 API contracts indexed on the APIs.io network, including Render API, Status API, Template API, and 3 more. Tagged areas include Document Generation, PDF, Templates, Open Source, and Office.

The Carbone catalog on APIs.io includes 1 Spectral governance ruleset.

Carbone’s developer surface includes authentication, documentation, pricing, GitHub presence, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

33.5/100 thin ▬ flat Agent 20/100 agent aware Front door AI 6/6 dominant Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serveFree trial⚡ Free to try

1 published contract

Document Generation PDF Templates Open Source OfficeDOCXXLSX

Kin Score

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

Composite quality — 33.5/100 · thin

Contract Quality 8.9 / 19

Developer Ergonomics 4.7 / 15

Access Clarity 3.9 / 15

Operational Transparency 2.3 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 1.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 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
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
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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):

Access Clarity scores 26.3 — up to +14.7 composite points
Developer Ergonomics scores 31.0 — up to +13.8 composite points
Contract Quality scores 47.5 — up to +13.1 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/carbone/apis.yml: open an issue on github.com/api-evangelist/carbone 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
PDF and Document Standards (PDF tooling, document signing trust, invoice documents)	builds-on	34.9	1	-
Artifact Hub Cloud-Native Packages	builds-on	34.9	1	-
Airtable Marketplace (extension builders)	builds-on	34.9	1	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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.

PDF

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Carbone Cloud HTTP API

Cloud-hosted Carbone API. Two flows — upload-once via POST /template then render with a template ID; or single-request inline-base64 render. Bearer-token auth (Authorization hea...

Carbone On-Premises

Self-hosted Carbone deployment exposing the same HTTP API. Auth disabled by default; enable via configuration. 30-day free trial of paid features.

Carbone Render Engine (Open Source)

Open-source Node.js library that powers the rendering engine. Embed directly in your application; render templates with JSON data without hitting the cloud API.

Carbone Render API

The Render API from Carbone — 3 operation(s) for render.

Carbone Status API

The Status API from Carbone — 1 operation(s) for status.

Carbone Template API

The Template API from Carbone — 2 operation(s) for template.

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Carbone Cloud HTTP Render API

OPEN COLLECTION

Carbone Cloud HTTP Render Status API

OPEN COLLECTION

Carbone Cloud HTTP Render Template API

OPEN COLLECTION

Carbone Cloud HTTP API

OPEN COLLECTION

Carbone API pricing

Not yet checked against Carbone's own pricing page. Compiled by API Evangelist on 2026-05-08 from carbone.io/pricing.html; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Cloud — Free free	Free
Cloud — Essential subscription	$29 per plan price / month · $26 per annual monthly price / month
Cloud — Essential Plus subscription	$95 per plan price / month · $85 per annual monthly price / month
Cloud — Advanced subscription	$159 per plan price / month
Cloud — Advanced Plus subscription	$295 per plan price / month
Cloud — Advanced Ultra subscription	$595 per plan price / month
On-Prem — Free free	Free
On-Prem — Fit subscription	$1500 per annual price

All 11 plans, limits and sources →

Rate limits

Sync render timeout: 60 seconds
Async render timeout: 300 seconds
Render document availability: 1 hours

Compiled by API Evangelist, not yet checked against Carbone's documentation. All 4 limits →

Billed by: plan-month / document · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Carbone Plans Pricing

11 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Carbone Rate Limits

4 limits

RATE LIMITS

Service Levels 1

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

Carbone

SLA

FinOps 1

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

Carbone Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Carbone API Rules

53 rules · 51 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Carbone Authentication

http · 1 scheme

SECURITY

Carbone Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Carbone Agentic Access

7 operations · 4 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 3

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: carbone
url: https://raw.githubusercontent.com/api-evangelist/carbone/refs/heads/main/apis.yml
name: Carbone
kind: company
description: Carbone is a document generation engine that uses Word, Excel, PowerPoint and ODF templates with JSON data to
  produce PDFs or office documents. The Carbone HTTP API offers a template-then-render workflow with both cloud (api.carbone.io)
  and on-prem deployments. The Carbone JS rendering engine is open-source and embeddable.
deliveryModel:
  model: unknown
  license_evidence:
    repo: carboneio/carbone
    spdx: NOASSERTION
    stars: 2118
  open_source: unknown
  commercial: true
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - pricing
  - repository-unlicensed
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: true
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium (free trial) · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/carbone.png
tags:
- Document Generation
- PDF
- Templates
- Open Source
- Office
- DOCX
- XLSX
tags_raw:
- Document Generation
- PDF
- Templates
- Open Source
- Office
- DOCX
- XLSX
- Open-Source
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.23'
apis:
- aid: carbone:cloud
  name: Carbone Cloud HTTP API
  description: Cloud-hosted Carbone API. Two flows — upload-once via POST /template then render with a template ID; or single-request
    inline-base64 render. Bearer-token auth (Authorization header). Sync and async via webhooks. Hosted on European providers
    (OVHCloud, Scaleway, BunnyCDN).
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://carbone.io/api-reference.html
  baseURL: https://api.carbone.io
  tags:
  - REST
  - Templates
  - Render
  - Async
  - Webhook
  tags_raw:
  - REST
  - Templates
  - Render
  - Async
  - Webhooks
  properties:
  - type: Documentation
    url: https://carbone.io/api-reference.html
  - type: Authentication
    url: https://carbone.io/api-reference.html#authentication
  - type: SDKs
    url: https://github.com/carboneio/carbone-sdk-js
- aid: carbone:on-prem
  name: Carbone On-Premises
  description: Self-hosted Carbone deployment exposing the same HTTP API. Auth disabled by default; enable via configuration.
    30-day free trial of paid features.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://carbone.io/documentation.html
  baseURL: http://<your-host>:4000
  tags:
  - REST
  - Self-Hosted
  - On-Prem
  properties:
  - type: Documentation
    url: https://carbone.io/documentation.html
- aid: carbone:js
  name: Carbone Render Engine (Open Source)
  description: Open-source Node.js library that powers the rendering engine. Embed directly in your application; render templates
    with JSON data without hitting the cloud API.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://github.com/carboneio/carbone
  baseURL: npm:carbone
  tags:
  - SDK
  - Open Source
  - Node.js
  tags_raw:
  - SDK
  - Open Source
  - Node.js
  - Open-Source
  properties:
  - type: SourceCode
    url: https://github.com/carboneio/carbone
  - type: Documentation
    url: https://carbone.io/documentation.html
- aid: carbone:carbone-render-api
  name: Carbone Render API
  description: The Render API from Carbone — 3 operation(s) for render.
  humanURL: https://carbone.io/api-reference.html
  baseURL: https://api.carbone.io
  tags:
  - Render
  properties:
  - type: OpenAPI
    url: openapi/carbone-render-api-openapi.yml
- aid: carbone:carbone-status-api
  name: Carbone Status API
  description: The Status API from Carbone — 1 operation(s) for status.
  humanURL: https://carbone.io/api-reference.html
  baseURL: https://api.carbone.io
  tags:
  - Status
  properties:
  - type: OpenAPI
    url: openapi/carbone-status-api-openapi.yml
- aid: carbone:carbone-template-api
  name: Carbone Template API
  description: The Template API from Carbone — 2 operation(s) for template.
  humanURL: https://carbone.io/api-reference.html
  baseURL: https://api.carbone.io
  tags:
  - Templates
  tags_raw:
  - Template
  properties:
  - type: OpenAPI
    url: openapi/carbone-template-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/carboneio/carbone/issues
- type: SecurityPolicy
  url: https://github.com/carboneio/carbone/blob/master/SECURITY.md
- type: AgenticAccess
  url: agentic-access/carbone-agentic-access.yml
- type: DomainSecurity
  url: security/carbone-domain-security.yml
- type: Authentication
  url: authentication/carbone-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/carboneio
- type: Website
  url: https://carbone.io/
- type: Documentation
  url: https://carbone.io/documentation.html
- type: Pricing
  url: https://carbone.io/pricing.html
- type: GitHub
  url: https://github.com/carboneio
- type: Plans
  url: plans/carbone-plans-pricing.yml
- type: RateLimits
  url: rate-limits/carbone-rate-limits.yml
- type: FinOps
  url: finops/carbone-finops.yml
- url: https://carbone.io/blog/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Carbone API — frequently asked questions

Does Carbone have an API?

Yes. APIs.io lists 6 APIs from Carbone, including Carbone Cloud HTTP API, Carbone On-Premises and Carbone Render Engine (Open Source), and 3 more.

Is there an OpenAPI specification for the Carbone API?

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

How do I authenticate with the Carbone API?

Carbone uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Carbone Authentication.

How much does the Carbone API cost?

APIs.io lists 11 pricing plans for Carbone, with each plan's price, limits and inclusions under Pricing on this page.

Is the Carbone API ready for AI agents?

Carbone has a Kin Score of 33.5 out of 100 (thin) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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