Cairn

Cairn provides a shared memory map for people and AI, enabling every AI you use to stay up to speed. It keeps memories with receipts so agents can find decision origins and continue from there. The platform offers free and pro plans, with features like private collections, AI allowances, and Moss Care passes.

Cairn is listed with 1 API on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Memory, Platform, and Collaboration.

Cairn’s developer surface includes pricing and 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

17.3/100 emerging Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

Company Artificial Intelligence Memory Platform Collaboration

Kin Score

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

Composite quality — 17.3/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 9.2 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.2 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 0 / 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 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 6 / 6

Protected Resource Metadata 5 / 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 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
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

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 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Operational Transparency scores 0.0 — up to +13.0 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/cairn-ink/apis.yml: open an issue on github.com/api-evangelist/cairn-ink 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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

Cairn Memory API

Shared memory map API for people and AI

Cairn API pricing

Prices published by Cairn, read 2026-11-03 from cairn.ink/pricing.

Plan	Price
Free	US$0
Pro	US$7.50 per month
Team	US$18 per month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Cairn Ink Plans Pricing

3 plans

PLANS

Security Posture 1

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

Cairn Ink Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: cairn-ink
name: Cairn
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  probe_state: unreadable
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://cairn.ink/og/cairn-share.png
description: Cairn provides a shared memory map for people and AI, enabling every AI you use to stay up to speed. It keeps
  memories with receipts so agents can find decision origins and continue from there. The platform offers free and pro plans,
  with features like private collections, AI allowances, and Moss Care passes.
url: https://artifacts.apis.io/cairn-ink/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Artificial Intelligence
- Memory
- Platform
- Collaboration
tags_raw:
- Company
- AI
- Memory
- Platform
- Collaboration
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/cairn-ink-plans-pricing.yml
- type: WellKnown
  url: well-known/cairn-ink-well-known.yml
- type: Hosts
  url: hosts/cairn-ink-hosts.yml
- type: Vendors
  url: vendors/cairn-ink-vendors.yml
- type: TermsOfService
  url: https://cairn.ink/terms
- type: PrivacyPolicy
  url: https://cairn.ink/privacy
- type: Pricing
  url: https://cairn.ink/pricing
- type: Login
  url: https://cairn.ink/sign-in
- type: DomainSecurity
  url: security/cairn-ink-domain-security.yml
- type: Website
  url: https://cairn.ink/
apis:
- name: Cairn Memory API
  description: Shared memory map API for people and AI
  humanURL: https://cairn.ink/
  baseURL: https://api.cairn.ink
  aid: cairn-ink:cairn-memory-api
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: OpenAPI spec not found at https://api.cairn.ink/openapi.json (404)
  evidence:
  - url: https://api.cairn.ink/openapi.json
    status: 404
  checked: '2026-11-03'
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 11
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Cairn API — frequently asked questions

Does Cairn have an API?

Yes. APIs.io lists 1 API from Cairn, including Cairn Memory API.

How much does the Cairn API cost?

Cairn publishes its prices; its Free plan is US$0 as of 2026-11-03. APIs.io lists 3 pricing plans for Cairn, with each plan's price, limits and inclusions under Pricing on this page.

Is the Cairn API ready for AI agents?

Cairn has a Kin Score of 17.3 out of 100 (emerging) and an Agent Readiness score of 18.7 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
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.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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