Estamp

E-Stamp Corporation (eStamp) was a dot-com era Internet-postage company, a Canaan Partners seed-stage portfolio company that competed with Stamps.com to let users buy and print official U.S. Postal Service postage online. The company is defunct: on April 30, 2001 Stamps.com acquired E-Stamp's name, 31 Internet-postage patents, and the estamp.com domain, which today 301-redirects to stamps.com. There is no live company, product, developer portal, or API surface to enrich; this profile is retained as a historical portfolio-lead record.

Estamp is profiled on the APIs.io network. Tagged areas include Company, Internet Postage, Postage, Shipping, and E-Commerce.

🌐 Visit website 📡 Source on GitHub
5.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0
0 APIs
CompanyInternet PostagePostageShippingE-CommerceDefunctDot-Com EraAcquired

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0
Composite quality — 5.0/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 0.0 / 20
Access Clarity 0.0 / 20
Operational Transparency 0.0 / 13
Contract Governance 0.0 / 12
Discoverability 5.0 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
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
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
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/estamp: 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)

apis.yml Raw ↑ 
aid: estamp
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/estamp.png
name: Estamp
description: 'E-Stamp Corporation (eStamp) was a dot-com era Internet-postage company, a Canaan Partners seed-stage portfolio
  company that competed with Stamps.com to let users buy and print official U.S. Postal Service postage online. The company
  is defunct: on April 30, 2001 Stamps.com acquired E-Stamp''s name, 31 Internet-postage patents, and the estamp.com domain,
  which today 301-redirects to stamps.com. There is no live company, product, developer portal, or API surface to enrich;
  this profile is retained as a historical portfolio-lead record.'
url: https://raw.githubusercontent.com/api-evangelist/estamp/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- canaan-partners
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-detail: Name, patents, and estamp.com domain acquired by Stamps.com on 2001-04-30; domain now redirects to stamps.com
x-acquired-by: stamps.com
x-enriched: '2026-07-19'
x-enrichment-result: nochange-no-live-surface
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Internet Postage
- Postage
- Shipping
- E-Commerce
- Defunct
- Dot-Com Era
- Acquired
tags_raw:
- Company
- Internet Postage
- Postage
- Shipping
- E-Commerce
- Defunct
- Dot-com Era
- Acquired
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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