ThirdLove

ThirdLove is a San Francisco-based direct-to-consumer women's intimate apparel brand best known for its online Fit Finder quiz and half-cup bra sizing, selling bras, underwear, and loungewear direct to consumers through its e-commerce site. It was surfaced in the API Evangelist network as a portfolio company of a16z and Felicis. An enrichment pass on 2026-07-21 found no public developer or API surface — no developer subdomain, no documented API, no /.well-known/ discovery documents, and no security.txt or trust-center program. Only a domain-security probe of thirdlove.com yielded real data (TLS 1.3, HSTS, SPF, DMARC).

ThirdLove is profiled on the APIs.io network. Tagged areas include Company, Retail, E-Commerce, Apparel, and Direct-to-Consumer.

🌐 Visit website 📡 Source on GitHub
6.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyRetailE-CommerceApparelDirect-to-ConsumerConsumer Brand

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 6.8/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.0 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/thirdlove: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

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

Thirdlove Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: thirdlove
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/thirdlove.png
name: ThirdLove
description: ThirdLove is a San Francisco-based direct-to-consumer women's intimate apparel brand best known for its online
  Fit Finder quiz and half-cup bra sizing, selling bras, underwear, and loungewear direct to consumers through its e-commerce
  site. It was surfaced in the API Evangelist network as a portfolio company of a16z and Felicis. An enrichment pass on 2026-07-21
  found no public developer or API surface — no developer subdomain, no documented API, no /.well-known/ discovery documents,
  and no security.txt or trust-center program. Only a domain-security probe of thirdlove.com yielded real data (TLS 1.3, HSTS,
  SPF, DMARC).
url: https://raw.githubusercontent.com/api-evangelist/thirdlove/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- felicis
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Retail
- E-Commerce
- Apparel
- Direct-to-Consumer
- Consumer Brand
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/thirdlove-domain-security.yml
- type: Website
  url: https://thirdlove.com
x-enrichment:
  date: '2026-07-21'
  status: minimal
  artifacts_added: 1
  pass: local-v1