Fort

Fort is a Y Combinator (W26) hardware startup building a screenless wearable that automatically tracks strength training for people who care about longevity. Founded by three former Tesla engineers, the device uses heart rate and motion sensing to detect gym sessions, workout classes, sleep, and recovery without requiring the wearer to manually log reps, sets, or exercises, then delivers actionable feedback on how lifestyle factors affect strength progress. Fort is styled as jewelry rather than performance gear, ships in three finishes with 7+ day battery life, and pairs with Fort Foundations, an expert-led training program built around core movement patterns. The product is currently available for pre-order and has no public developer API or programmatic surface at this time; this profile captures the company's public web and commercial presence.

Fort is profiled on the APIs.io network. Tagged areas include Company, Wearables, Health, Fitness, and Strength Training.

Fort’s developer surface includes engineering blog, pricing, signup flow, support, and 5 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

15.0/100 emerging ▬ flat Agent 0/100 human only Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Wearables Health Fitness Strength Training Consumer Hardware Longevity IoT

Kin Score

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

Composite quality — 15.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.2 / 17

Access Clarity 7.6 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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 Health 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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 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 7.1 — up to +18.6 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/fort/apis.yml: open an issue on github.com/api-evangelist/fort 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
Apple Accessory & Device Ecosystem (MFi, Matter, Apple partners)	undeclared	-	-	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 1

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.

Universal Commerce Protocol (UCP)

measured — observed by APIs.io (shopify)

Security Posture 1

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

Fort Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Blog

Blog

Website

Website

X-LinkedIn

X-LinkedIn

Source (apis.yml)

aid: fort
name: Fort
description: Fort is a Y Combinator (W26) hardware startup building a screenless wearable that automatically tracks strength
  training for people who care about longevity. Founded by three former Tesla engineers, the device uses heart rate and motion
  sensing to detect gym sessions, workout classes, sleep, and recovery without requiring the wearer to manually log reps,
  sets, or exercises, then delivers actionable feedback on how lifestyle factors affect strength progress. Fort is styled
  as jewelry rather than performance gear, ships in three finishes with 7+ day battery life, and pairs with Fort Foundations,
  an expert-led training program built around core movement patterns. The product is currently available for pre-order and
  has no public developer API or programmatic surface at this time; this profile captures the company's public web and commercial
  presence.
url: https://raw.githubusercontent.com/api-evangelist/fort/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://fort.cx/images/og-image.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-yc-batch: W26
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Wearables
- Health
- Fitness
- Strength Training
- Consumer Hardware
- Longevity
- IoT
apis: []
common:
- url: https://fort.cx/blog
  type: Blog
- type: Website
  url: https://fort.cx
- type: Pricing
  url: https://fort.cx/order
- type: SignUp
  url: https://fort.cx/waitlist
- type: Support
  url: https://fort.cx/faq
- type: TermsOfService
  url: https://fort.cx/terms
- type: PrivacyPolicy
  url: https://fort.cx/privacy
- type: X-LinkedIn
  url: https://www.linkedin.com/company/fortwearable
- type: DomainSecurity
  url: security/fort-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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