Zong

Zong was a mobile carrier-billing micropayments company that let consumers buy digital goods, apps, and content and charge them directly to their mobile phone bill, without entering credit-card details. Founded in 2008 (spun out of Echovox) and led by CEO David Marcus, Zong was backed by Matrix Partners and NewMargin Ventures and published a developer API for selling and delivering content to mobile customers worldwide. eBay acquired Zong in 2011 for roughly $240M and folded its technology into PayPal; the brand went offline around May 2015 and zong.com now redirects to PayPal. The company is defunct and operates no live API or developer platform today.

Zong is profiled on the APIs.io network. Tagged areas include Company, Fintech, Payments, Mobile Payments, and Carrier Billing.

🌐 Visit website 📡 Source on GitHub

0.1/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

0 APIs

Company Fintech Payments Mobile Payments Carrier Billing Micropayments Defunct Acquired

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 0.1/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 0.0 / 15

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

Regulatory Posture applies to this provider. Its tags matched the Payments 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.

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/. This rating is computed from github.com/api-evangelist/zong: 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: zong
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/zong.png
name: Zong
description: Zong was a mobile carrier-billing micropayments company that let consumers buy digital goods, apps, and content
  and charge them directly to their mobile phone bill, without entering credit-card details. Founded in 2008 (spun out of
  Echovox) and led by CEO David Marcus, Zong was backed by Matrix Partners and NewMargin Ventures and published a developer
  API for selling and delivering content to mobile customers worldwide. eBay acquired Zong in 2011 for roughly $240M and folded
  its technology into PayPal; the brand went offline around May 2015 and zong.com now redirects to PayPal. The company is
  defunct and operates no live API or developer platform today.
url: https://raw.githubusercontent.com/api-evangelist/zong/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- matrix-partners
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-detail: Acquired by eBay in 2011 and folded into PayPal; brand offline since ~2015, zong.com redirects to PayPal.
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Fintech
- Payments
- Mobile Payments
- Carrier Billing
- Micropayments
- 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