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.
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/.
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 github.com/api-evangelist/leanmarket: open an issue to ask a question, or submit a pull request to add artifacts.
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aid: leanmarket
deliveryModel:
model: unknown
open_source: false
commercial: false
callable_host: false
label: Delivery model not determined — needs a product licence on record
confidence: low
source:
- none
generated: '2026-08-28'
method: derived
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: '0.23'
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
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