# CardSpring

**Canonical:** https://apis.io/providers/cardspring/  
**Website:** http://cardspring.com/  
**APIs profiled:** 0

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.

## Kin Score — 0.1 / 100 (minimal)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 0.1).

| Facet | Score |
|---|---|
| Discoverability | 50.0 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 0.0 |
| Commercial Clarity | 0.0 |
| Access Clarity | 0.0 |

Regulatory layer — **Payments**: 0.0 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Tags

Company, Payments, Card Linking, Offers, Loyalty, Commerce, Defunct

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/cardspring/). Scores are computed from the provider's own public artifacts under a published rubric.