CardSpring

CardSpring was a card-linked offers and payments platform that provided an API for building card-linked applications, letting developers connect merchant point-of-sale systems and consumer payment cards to deliver digital coupons, loyalty rewards, and receipt-level offers. It was surfaced as a portfolio company of Accel and DCVC and added to the API Evangelist network as a stub for enrichment. The company was acquired by Twitter in 2014 and subsequently wound down; as of this pass every path on cardspring.com (including the old /help/developer_faq.html) 307-redirects to an Afternic "cardspring.com is for sale" domain-sale lander, developer.cardspring.com fails TLS with no matching certificate, and no first-party CardSpring packages remain on npm or RubyGems. There is no live developer portal, documentation, API, or OpenAPI surface to enrich. Sector: payments.

CardSpring is profiled on the APIs.io network. Tagged areas include Company, Payments, Card Linking, Offers, and Loyalty.

🌐 Visit website 📡 Source on GitHub

5.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyPaymentsCard LinkingOffersLoyaltyCommerceDefunct

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 5.7/100 · 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/cardspring: 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

Website

Website

Source (apis.yml)

aid: cardspring
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/cardspring.png
name: CardSpring
description: 'CardSpring was a card-linked offers and payments platform that provided an API for building card-linked applications,
  letting developers connect merchant point-of-sale systems and consumer payment cards to deliver digital coupons, loyalty
  rewards, and receipt-level offers. It was surfaced as a portfolio company of Accel and DCVC and added to the API Evangelist
  network as a stub for enrichment. The company was acquired by Twitter in 2014 and subsequently wound down; as of this pass
  every path on cardspring.com (including the old /help/developer_faq.html) 307-redirects to an Afternic "cardspring.com is
  for sale" domain-sale lander, developer.cardspring.com fails TLS with no matching certificate, and no first-party CardSpring
  packages remain on npm or RubyGems. There is no live developer portal, documentation, API, or OpenAPI surface to enrich.
  Sector: payments.'
url: https://raw.githubusercontent.com/api-evangelist/cardspring/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- accel
- dcvc
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Payments
- Card Linking
- Offers
- Loyalty
- Commerce
- Defunct
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: http://cardspring.com/
x-enrichment:
  date: '2026-07-20'
  status: nochange
  artifacts_added: 0
  pass: local-v1