Dapper

Dapper was an advertising-technology and web-data company founded in 2006 by Jonathan Aizen and Eran Shir, seed-funded by Accel. It ran two surfaces: Dapper Ads, an intent-driven dynamic-ad product that pulled live product and inventory data from an advertiser's own site into targeted creative without IT integration; and open.dapper.net (the "Dapp Factory" / Dapper: The Data Mapper), a hosted tool that turned any web page into structured feeds, web services and widgets — XML, RSS, JSON, YAML, CSV, iCalendar, Google Gadgets, Netvibes modules and image loops — effectively letting anyone "create an API for any site" before providers published their own. Dapper was acquired by Yahoo! in 2010 and both surfaces were shut down; dapper.net now resolves to Yahoo nameservers with no host, and open.dapper.net no longer resolves. There is no live API, developer portal, or documentation to enrich.

Dapper is profiled on the APIs.io network. Tagged areas include Company, Advertising, AdTech, Web Scraping, and Data Extraction.

🌐 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

CompanyAdvertisingAdTechWeb ScrapingData ExtractionMashupsDefunctAcquired

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

Resources

Company 1

The organization behind the API

InvestorProfile

InvestorProfile

Other 2

Properties that don't map to a standard resource type

Archive

Source (apis.yml)

aid: dapper
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/dapper.png
name: Dapper
description: 'Dapper was an advertising-technology and web-data company founded in 2006 by Jonathan Aizen and Eran Shir, seed-funded
  by Accel. It ran two surfaces: Dapper Ads, an intent-driven dynamic-ad product that pulled live product and inventory data
  from an advertiser''s own site into targeted creative without IT integration; and open.dapper.net (the "Dapp Factory" /
  Dapper: The Data Mapper), a hosted tool that turned any web page into structured feeds, web services and widgets — XML,
  RSS, JSON, YAML, CSV, iCalendar, Google Gadgets, Netvibes modules and image loops — effectively letting anyone "create an
  API for any site" before providers published their own. Dapper was acquired by Yahoo! in 2010 and both surfaces were shut
  down; dapper.net now resolves to Yahoo nameservers with no host, and open.dapper.net no longer resolves. There is no live
  API, developer portal, or documentation to enrich.'
url: https://raw.githubusercontent.com/api-evangelist/dapper/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
x-status: defunct
x-acquired-by: Yahoo!
x-acquired-year: 2010
x-tier: stub
x-tier-reason: defunct-no-api-surface
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Advertising
- AdTech
- Web Scraping
- Data Extraction
- Mashups
- Defunct
- Acquired
apis: []
common:
- type: InvestorProfile
  name: Accel portfolio profile
  url: https://www.accel.com/companies/dapper
- type: Archive
  name: dapper.net (archived 2010, site no longer live)
  url: https://web.archive.org/web/20100601000000/http://www.dapper.net/
- type: Archive
  name: open.dapper.net Dapp Factory (archived 2010, no longer live)
  url: https://web.archive.org/web/20100601000000/http://open.dapper.net/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: minimal
  artifacts_added: 0
  pass: local-v1