FamilySearch Family Tree download + WebHints

FamilySearch provides a free, nonprofit genealogy platform that allows users to build, share, and explore family trees. It offers access to billions of historical records and a suite of tools for family history research. The service includes APIs that enable developers to integrate FamilySearch data and functionality into applications, supporting tasks such as searching records, retrieving person information, and managing family tree data.

FamilySearch Family Tree download + WebHints is listed with 1 API on the APIs.io network. Tagged areas include Genealogy, Family History, Nonprofit, API, and Data.

FamilySearch Family Tree download + WebHints’ developer surface includes documentation and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

10.6/100 minimal Agent 6/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

GenealogyFamily HistoryNonprofitAPIData

Kin Score

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

Composite quality — 10.6/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 2.8 / 17

Access Clarity 2.2 / 17

Operational Transparency 0.6 / 11

Contract Governance 0.0 / 10

Discoverability 4.6 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 6/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 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 4 / 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

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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

11 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
Access Clarity scores 13.2 — up to +17.4 composite points
Developer Ergonomics scores 16.7 — up to +16.7 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/familysearch/apis.yml: open an issue on github.com/api-evangelist/familysearch 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 1

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

FamilySearch API

The FamilySearch API provides programmatic access to genealogical data, records search, and family tree management as documented on the developer portal.

Security Posture 1

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

Familysearch Domain Security

TLSv1.2 · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Vendors

Vendors

Hosts

Hosts

Source (apis.yml)

aid: familysearch
name: FamilySearch Family Tree download + WebHints
description: FamilySearch provides a free, nonprofit genealogy platform that allows users to build, share, and explore family
  trees. It offers access to billions of historical records and a suite of tools for family history research. The service
  includes APIs that enable developers to integrate FamilySearch data and functionality into applications, supporting tasks
  such as searching records, retrieving person information, and managing family tree data.
url: https://artifacts.apis.io/familysearch/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:
- Genealogy
- Family History
- Nonprofit
- API
- Data
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Vendors
  url: vendors/familysearch-vendors.yml
- type: LLMsTxt
  url: llms/familysearch-llms.txt
- type: WellKnown
  url: well-known/familysearch-well-known.yml
- type: Hosts
  url: hosts/familysearch-hosts.yml
- type: SDKs
  url: packages/familysearch-packages.yml
- type: Packages
  url: packages/familysearch-packages.yml
- type: Login
  url: https://community.familysearch.org/en/discussions/tagged/sign-in
- type: Documentation
  url: https://developers.familysearch.org/
- type: GitHubOrganization
  url: https://github.com/FamilySearch
- type: DomainSecurity
  url: security/familysearch-domain-security.yml
- type: Website
  url: https://familysearch.org/
apis:
- name: FamilySearch API
  description: The FamilySearch API provides programmatic access to genealogical data, records search, and family tree management
    as documented on the developer portal.
  humanURL: https://developers.familysearch.org/
  baseURL: null
  aid: familysearch:familysearch-api
x-submission-probe: 200 https://www.familysearch.org/en/united-states/, 2026-10-26
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Developer portal at https://developers.familysearch.org/ is a React app with no machine‑readable OpenAPI or other
    contract.
  evidence:
  - url: https://developers.familysearch.org/
    status: 200
  checked: '2026-10-28'
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 11
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

FamilySearch Family Tree download + WebHints API — frequently asked questions

Does FamilySearch Family Tree download + WebHints have an API?

Yes. APIs.io lists 1 API from FamilySearch Family Tree download + WebHints, including FamilySearch API.

Is the FamilySearch Family Tree download + WebHints API ready for AI agents?

FamilySearch Family Tree download + WebHints has a Kin Score of 10.6 out of 100 (minimal) and an Agent Readiness score of 6.0 (agent-aware), scored by API Evangelist on 2026-10-31.

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