Betula

Betula is a free self‑hosted single‑user federated bookmark manager for the independent web, offering archival support. It lets users organize bookmarks, maintain a linklog, and create personal web archives with Mycomarkup formatting, tag management, and privacy controls for public or private sharing.

Betula is listed with 2 APIs on the APIs.io network. Tagged areas include Bookmark Manager, Federated, Open Source, Self-hosted, and Independent Web.

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

Betula’s developer surface includes getting-started guide, documentation, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

17.6/100 emerging Agent 25/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Bookmark ManagerFederated Open SourceSelf-hostedIndependent WebCompany

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 17.6/100 · emerging

Contract Quality 2.4 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.7 / 11

Contract Governance 2.2 / 10

Discoverability 4.7 / 9

Regulatory Posture 2.5 / 15

Agent readiness — 25/100 · agent aware

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 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

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):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

10 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 11.3 — up to +22.2 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 21.4 — up to +15.7 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/betula/apis.yml: open an issue on github.com/api-evangelist/betula 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 →

APIs 2

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

Betula API

Betula provides a bookmark management API documented at https://joinbetula.org/installation.html. No machine‑readable contract (OpenAPI, AsyncAPI, GraphQL) was found.

Betula API

Betula API as documented publicly: 137 operations. Contract generated from the documentation by API Evangelist (2026-10-28); not the provider's own document.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Betula API Rules

10 rules · 8 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Betula Domain Security

TLSv1.3

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

Documentation

Documentation

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Vocabulary

Vocabulary

Conformance

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

CodeRepository

CodeRepository

Access & Security 2

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Company 2

The organization behind the API

Newsroom

Newsroom

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

DockerHub

DockerHub

Source (apis.yml)

aid: betula
name: Betula
description: Betula is a free self‑hosted single‑user federated bookmark manager for the independent web, offering archival
  support. It lets users organize bookmarks, maintain a linklog, and create personal web archives with Mycomarkup formatting,
  tag management, and privacy controls for public or private sharing.
url: https://artifacts.apis.io/betula/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- Bookmark Manager
- Federated
- Open Source
- Self-hosted
- Independent Web
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/betula-rules.yml
- type: Vocabulary
  url: vocabulary/betula-vocabulary.yml
- type: Conformance
  url: conformance/betula-conformance.yml
- type: SecurityTxt
  url: well-known/betula-codeberg-security.txt
- type: WellKnown
  url: well-known/betula-well-known.yml
- type: Hosts
  url: hosts/betula-hosts.yml
- type: Vendors
  url: vendors/betula-vendors.yml
- type: Newsroom
  url: https://joinbetula.org/media/betula-v1.9.0.png
- type: GettingStarted
  url: https://docs.codeberg.org/getting-started/
- type: DomainSecurity
  url: security/betula-domain-security.yml
- type: Website
  url: https://joinbetula.org/
- type: Documentation
  url: https://joinbetula.org/installation.html
- type: Documentation
  url: https://joinbetula.org/building.html
- type: Documentation
  url: https://joinbetula.org/https-domain.html
- type: GitHubOrganization
  url: https://github.com/bouncepaw/betula
- type: CodeRepository
  url: https://codeberg.org/bouncepaw/betula
- type: DockerHub
  url: https://hub.docker.com/r/bouncepaw/betula/tags
apis:
- name: Betula API
  description: Betula provides a bookmark management API documented at https://joinbetula.org/installation.html. No machine‑readable
    contract (OpenAPI, AsyncAPI, GraphQL) was found.
  humanURL: https://joinbetula.org/installation.html
  baseURL: null
  aid: betula:betula-api-2
- aid: betula:betula-api
  name: Betula API
  description: 'Betula API as documented publicly: 137 operations. Contract generated from the documentation by API Evangelist
    (2026-10-28); not

    the provider''s own document.'
  humanURL: https://docs.docker.com/reference/dockerfile
  baseURL: https://hub.docker.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/betula-openapi-generated.yml
    x-provenance: generated
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The provider's documentation at https://joinbetula.org/ contains only HTML pages with no machine‑readable OpenAPI,
    AsyncAPI, GraphQL or other contract.
  evidence:
  - url: https://joinbetula.org/
    status: 200
  checked: '2026-10-28'
x-submission-probe: 200, 2026-10-26
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 14
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Betula API — frequently asked questions

Does Betula have an API?

Yes. APIs.io lists 2 APIs from Betula, including Betula API and Betula API.

Is there an OpenAPI specification for the Betula API?

Yes. APIs.io indexes 2 OpenAPI specifications for Betula, each linked for download from this page.

Is the Betula API ready for AI agents?

Betula has a Kin Score of 17.6 out of 100 (emerging) and an Agent Readiness score of 25.4 (agent-aware), scored by API Evangelist on 2026-10-31.

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