LeanMarket

LeanMarket was a mobile advertising technology company headquartered in Mountain View, California, that brought real-time bidding (RTB) display advertising to small and mid-sized advertisers through a self-serve platform. Its pitch was transparency and operator control: advertisers could pull reports showing in-depth data on every mobile app and mobile website their ads appeared in — in contrast to blind ad networks — and could tweak, optimize and scale campaigns themselves through a self-serve interface with up-to-the-second reporting, rather than waiting on an account manager to make changes. The company went through the Y Combinator Summer 2012 (S12) batch and appears on the Andreessen Horowitz investment list, with seed participation also reported from Initialized Capital. LeanMarket is defunct and operates no live product, developer portal or API today; this profile is retained for historical and network completeness.

LeanMarket is profiled on the APIs.io network. Tagged areas include Company, Advertising, Mobile Advertising, AdTech, and Real-Time Bidding.

🌐 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

CompanyAdvertisingMobile AdvertisingAdTechReal-Time BiddingProgrammatic AdvertisingDisplay AdvertisingMarketingY CombinatorDefunct

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/leanmarket: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Source (apis.yml)

aid: leanmarket
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/leanmarket.png
name: LeanMarket
description: 'LeanMarket was a mobile advertising technology company headquartered in Mountain View, California, that brought
  real-time bidding (RTB) display advertising to small and mid-sized advertisers through a self-serve platform. Its pitch
  was transparency and operator control: advertisers could pull reports showing in-depth data on every mobile app and mobile
  website their ads appeared in — in contrast to blind ad networks — and could tweak, optimize and scale campaigns themselves
  through a self-serve interface with up-to-the-second reporting, rather than waiting on an account manager to make changes.
  The company went through the Y Combinator Summer 2012 (S12) batch and appears on the Andreessen Horowitz investment list,
  with seed participation also reported from Initialized Capital. LeanMarket is defunct and operates no live product, developer
  portal or API today; this profile is retained for historical and network completeness.'
url: https://raw.githubusercontent.com/api-evangelist/leanmarket/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-accelerator: Y Combinator (S12)
x-headquarters: Mountain View, California, United States
x-status: defunct
x-status-detail: Listed as "Dead" in the Y Combinator company database (ycdb.co). The company's original site (www.lean.com,
  per YCDB) is no longer a live company property — it now serves an HTTrack mirror of the 2012-era LeanMarket site frozen
  2016-01-06, over HTTP only with no TLS. The leanmarket.com domain is parked and listed for sale (307 redirect to forsale.godaddy.com,
  Afternic nameservers, registrant behind a privacy service).
x-api-surface: none
x-tier: profiled
x-tier-reason: portfolio-lead-enriched
x-enrichment-note: 'Enrichment pass 2026-07-19 found no live provider surface to harvest. Probed: leanmarket.com (307 -> forsale.godaddy.com
  parking page), leanmarket.io / leanmarket.co / leanmarket.ai (no DNS/connection), www.lean.com (HTTP 200, static HTTrack
  mirror dated 2016-01-06 whose navigation is limited to About Us, Tour, What is RTB?, Contact Us and an advertiser Sign In
  — no developer, API or documentation section), and the GitHub organizations "leanmarket" and "lean-market" (both HTTP 404).
  No OpenAPI, SDKs, packages, MCP server, webhooks, changelog, status page or security.txt exist to capture. No artifacts
  were fabricated; the empty result is the correct outcome.'
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Advertising
- Mobile Advertising
- AdTech
- Real-Time Bidding
- Programmatic Advertising
- Display Advertising
- Marketing
- Y Combinator
- Defunct
apis: []
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