# FastSpring

**Canonical:** https://apis.io/providers/fastspring/  
**Website:** https://fastspring.com  
**APIs profiled:** 12

FastSpring is a full-service ecommerce and merchant-of-record platform for SaaS, software, and digital product companies, handling global payments, tax compliance, subscription billing, checkout, and revenue management. The FastSpring API is a REST interface for managing orders, subscriptions, products, coupons, customers, and webhook events, secured via HTTP Basic Authentication using credentials issued from the FastSpring App Dashboard and with HMAC SHA-256 signing available for webhook payload verification.

## Kin Score — 32.5 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 32.5).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 57.3 |
| Governance | 13.6 |
| Contract Governance | 13.6 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 13.1 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

Regulatory layer — **Payments**: 26.6 (matched via tags).

## Agent readiness — 29.4 (agent-aware)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (12)

- **FastSpring Accounts API** — The Accounts API from FastSpring — 3 operation(s) for accounts.
- **FastSpring Coupons API** — The Coupons API from FastSpring — 3 operation(s) for coupons.
- **FastSpring Data API** — The Data API from FastSpring — 4 operation(s) for data.
- **FastSpring Events API** — The Events API from FastSpring — 2 operation(s) for events.
- **FastSpring Invoices API** — The Invoices API from FastSpring — 2 operation(s) for invoices.
- **FastSpring Orders API** — The Orders API from FastSpring — 2 operation(s) for orders.
- **FastSpring Products API** — The Products API from FastSpring — 3 operation(s) for products.
- **FastSpring Quotes API** — The Quotes API from FastSpring — 3 operation(s) for quotes.
- **FastSpring Returns API** — The Returns API from FastSpring — 2 operation(s) for returns.
- **FastSpring Sessions API** — The Sessions API from FastSpring — 5 operation(s) for sessions.
- **FastSpring Subscriptions API** — The Subscriptions API from FastSpring — 7 operation(s) for subscriptions.
- **FastSpring Webhooks API** — The Webhooks API from FastSpring — 1 operation(s) for webhooks.

## Agentic access (1)

- **Fastspring Agentic Access** — 51 operations · 28 acting

## Security (3)

- **Fastspring Authentication** — http · 1 scheme
- **Fastspring Domain Security** — TLSv1.3 · HSTS · DMARC
- **Fastspring Trust Center** — SOC 2, PCI DSS, GDPR

## Tags

E-Commerce, Merchant of Record, Subscription Billing, Payments, SaaS Billing, Checkout, Tax Compliance

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