Carte

Carta provides an end‑to‑end suite for private capital markets, offering cap table management, equity plan administration, fund accounting, compliance, and a robust API platform for developers to integrate equity data, valuations, and workflow automation across investors, companies, and service providers.

Carte is listed with 2 APIs on the APIs.io network, including V1Alpha1 API, and 1 more. Tagged areas include Company, Finance, Equity, and Fund Management.

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

Carte’s developer surface includes authentication, engineering blog, API reference, getting-started guide, documentation, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.2/100 thin ▼ -8.9 Agent 32/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

2 APIs

Company Finance Equity Fund Management

Kin Score

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

Composite quality — 28.2/100 · thin

Contract Quality 3.3 / 19

Developer Ergonomics 4.3 / 15

Access Clarity 3.6 / 15

Operational Transparency 3.6 / 10

Contract Governance 2.0 / 9

Discoverability 4.3 / 8

Regulatory Posture 3.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 6 / 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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 17.6 — up to +20.6 composite points
Access Clarity scores 23.7 — up to +15.3 composite points
Developer Ergonomics scores 28.6 — up to +14.3 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/carte/apis.yml: open an issue on github.com/api-evangelist/carte 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.

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Carta API

API platform for private capital markets, providing endpoints for equity data, valuations, and workflow automation.

Carte V1Alpha1 API

The V1Alpha1 API from Carte — 10 operation(s) for v1alpha1.

Carte API pricing

Rate limits

second: Up to 10 requests/second
minute: Up to 300 requests/minute

Rate-limit details →

Rate Limits 1

Documented rate limits and quota policies.

Carte Rate Limits

2 limits

RATE LIMITS

Service Levels 1

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

Carte

SLA

Semantic Vocabularies 1

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

Carte Context

1 classes · 1 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Carte API Rules

11 rules · 8 errors 2 warnings 1 info

SPECTRAL

JSON Schema 1

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

PostV1Alpha1FilesUploadResponse

6 properties

JSON SCHEMA

Security Posture 3

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

Carte Authentication

1 scheme

SECURITY

Carte Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Carte Trust Center

SOC 2, ISO 27001, GDPR

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

Compliance

Authentication

SecurityTxt

Security

TrustCenter

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: carte
name: Carte
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: medium
  probe_state: unreadable
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-11-06'
  method: derived
image: https://images.ctfassets.net/y88td1zx1ufe/6RvXq471HohgYLlne9iKay/1e1a7d9f63a73e279fb38ab589210422/OG.png
description: Carta provides an end‑to‑end suite for private capital markets, offering cap table management, equity plan administration,
  fund accounting, compliance, and a robust API platform for developers to integrate equity data, valuations, and workflow
  automation across investors, companies, and service providers.
url: https://raw.githubusercontent.com/api-evangelist/carte/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-07 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-07'
modified: '2026-10-07'
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Company
- Finance
- Equity
- Fund Management
tags_raw:
- Company
- Finance
- Equity
- FundManagement
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/carte-rate-limits.yml
- type: Spectral
  url: rules/carte-rules.yml
- type: JSONLD
  url: json-ld/carte-context.jsonld
- type: Vocabulary
  url: vocabulary/carte-vocabulary.yml
- type: DataModel
  url: data-model/carte-data-model.yml
- type: Compliance
  url: https://trust.carta.com/
- type: Authentication
  url: authentication/carte-authentication.yml
- type: Conformance
  url: conformance/carte-conformance.yml
- type: LLMsTxt
  url: llms/carte-llms.txt
- type: SecurityTxt
  url: well-known/carte-status-security.txt
- type: WellKnown
  url: well-known/carte-well-known.yml
- type: Hosts
  url: hosts/carte-hosts.yml
- type: Vendors
  url: vendors/carte-vendors.yml
- type: StatusPage
  url: https://status.carta.com/
- type: Security
  url: https://carta.com/security/generative-ai-at-carta/
- type: PrivacyPolicy
  url: https://carta.com/privacy/
- type: Newsroom
  url: https://carta.com/press/
- type: Login
  url: https://login.app.carta.com/credentials/login/
- type: Leadership
  url: https://carta.com/learn/private-funds/management/
- type: Blog
  url: https://carta.com/blog/
- type: APIReference
  url: https://docs.carta.com/api-platform/reference/v-1-alpha-1-draft-issuers-create-draft-issuer
- type: GettingStarted
  url: https://docs.carta.com/api-platform/guides/getting-started/introduction
- type: Documentation
  url: https://docs.carta.com/
- type: GitHubOrganization
  url: https://github.com/carta
- type: TrustCenter
  url: security/carte-trust-center.yml
- type: DomainSecurity
  url: security/carte-domain-security.yml
- type: Website
  url: https://carta.com
apis:
- name: Carta API
  description: API platform for private capital markets, providing endpoints for equity data, valuations, and workflow automation.
  humanURL: https://docs.carta.com/api-platform/guides/getting-started/introduction
  baseURL: null
  aid: carte:carta-api
- aid: carte:carte-v1alpha1-api
  name: Carte V1Alpha1 API
  description: The V1Alpha1 API from Carte — 10 operation(s) for v1alpha1.
  humanURL: https://docs.carta.com/api-platform/guides/getting-started/introduction
  tags:
  - V1Alpha1
  properties:
  - type: OpenAPI
    url: openapi/carte-v1alpha1-api-openapi.yml
  - type: JSONSchema
    url: json-schema/carte-post-v1-alpha1-files-upload-response-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Docs at https://docs.carta.com provide API reference but no OpenAPI or other machine‑readable contract was found.
  evidence:
  - url: https://docs.carta.com/openapi.json
    status: 404
  checked: '2026-10-07'
x-enrichment:
  date: '2026-10-07'
  status: enriched
  artifacts_added: 19
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Carte API — frequently asked questions

Does Carte have an API?

Yes. APIs.io lists 2 APIs from Carte, including Carta API and Carte V1Alpha1 API.

Is there an OpenAPI specification for the Carte API?

Yes. APIs.io indexes 1 OpenAPI specification for Carte, each linked for download from this page.

How do I authenticate with the Carte API?

Carte documents its authentication (1 scheme). The details are profiled on APIs.io as Carte Authentication.

Is the Carte API ready for AI agents?

Carte has a Kin Score of 28.2 out of 100 (thin) and an Agent Readiness score of 32.0 (agent-ready), scored by API Evangelist on 2026-11-06.

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