Rockmelt

Rockmelt was a Chromium-based social web browser startup founded in 2008 and backed by Andreessen Horowitz (a16z), designed to integrate Facebook, Twitter, and web feeds directly into the browser chrome. The company was acquired by Yahoo in August 2013 and its products were discontinued shortly after. It was surfaced as an a16z portfolio company and added to the API Evangelist network as a stub. Enrichment confirms the company is defunct with no live web, developer, or API surface.

Rockmelt is profiled on the APIs.io network. Tagged areas include Company, Web Browser, Social, Defunct, and Acquired.

🌐 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

CompanyWeb BrowserSocialDefunctAcquired

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/rockmelt: 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: rockmelt
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/rockmelt.png
name: Rockmelt
description: Rockmelt was a Chromium-based social web browser startup founded in 2008 and backed by Andreessen Horowitz (a16z),
  designed to integrate Facebook, Twitter, and web feeds directly into the browser chrome. The company was acquired by Yahoo
  in August 2013 and its products were discontinued shortly after. It was surfaced as an a16z portfolio company and added
  to the API Evangelist network as a stub. Enrichment confirms the company is defunct with no live web, developer, or API
  surface.
url: https://raw.githubusercontent.com/api-evangelist/rockmelt/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-detail: Acquired by Yahoo August 2013; products discontinued; no live web/API surface as of enrichment.
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Web Browser
- Social
- Defunct
- Acquired
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: nochange
  artifacts_added: 0
  pass: local-v1