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FastSpring

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.

FastSpring publishes 12 APIs on the APIs.io network, including Accounts API, Coupons API, Data API, and 9 more. Tagged areas include Ecommerce, Merchant of Record, Subscription Billing, Payments, and SaaS Billing.

The FastSpring catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

FastSpring’s developer surface includes authentication, documentation, pricing, signup flow, support, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.1/100 thin ▬ flat Agent 33/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessSelf serve
12 APIs
EcommerceMerchant of RecordSubscription BillingPaymentsSaaS BillingCheckoutTax Compliance

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 36.1/100 · thin
Contract Quality 15.1 / 25
Developer Ergonomics 5.2 / 20
Commercial Clarity 3.7 / 20
Operational Transparency 0.7 / 13
Governance 5.7 / 12
Discoverability 7.4 / 10
Agent readiness — 33/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 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/fastspring: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

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.

Scroll for all 12

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

FastSpring API

OPEN COLLECTION

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

FastSpring Webhooks

AsyncAPI 2.6 description of FastSpring's outbound webhook surface. FastSpring delivers events to a seller-configured HTTPS endpoint as HTTP POSTs with a JSON envelope of one or ...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

FastSpring API Rules

7 rules · 1 errors 5 warnings 1 info

SPECTRAL

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fastspring Authentication

http · 1 scheme

SECURITY

Fastspring Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Fastspring Trust Center

SOC 2, PCI DSS, GDPR

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Fastspring Agentic Access

51 operations · 28 acting

51 operations · 28 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Signup
Signup

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 1

Pricing, plans, and the legal terms of use

Pricing
Pricing

Company 3

The organization behind the API

LinkedIn
LinkedIn
 Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

App Dashboard
App Dashboard

Source (apis.yml)

apis.yml Raw ↑ 
aid: fastspring
name: FastSpring
description: 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.
type: Index
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fastspring.png
tags:
- Ecommerce
- Merchant of Record
- Subscription Billing
- Payments
- SaaS Billing
- Checkout
- Tax Compliance
url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-30'
specificationVersion: '0.19'
apis:
- aid: fastspring:fastspring-accounts-api
  name: FastSpring Accounts API
  description: The Accounts API from FastSpring — 3 operation(s) for accounts.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/fastspring-accounts-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-coupons-api
  name: FastSpring Coupons API
  description: The Coupons API from FastSpring — 3 operation(s) for coupons.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Coupons
  properties:
  - type: OpenAPI
    url: openapi/fastspring-coupons-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-data-api
  name: FastSpring Data API
  description: The Data API from FastSpring — 4 operation(s) for data.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Data
  properties:
  - type: OpenAPI
    url: openapi/fastspring-data-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-events-api
  name: FastSpring Events API
  description: The Events API from FastSpring — 2 operation(s) for events.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/fastspring-events-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-invoices-api
  name: FastSpring Invoices API
  description: The Invoices API from FastSpring — 2 operation(s) for invoices.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Invoices
  properties:
  - type: OpenAPI
    url: openapi/fastspring-invoices-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-orders-api
  name: FastSpring Orders API
  description: The Orders API from FastSpring — 2 operation(s) for orders.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Orders
  properties:
  - type: OpenAPI
    url: openapi/fastspring-orders-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-products-api
  name: FastSpring Products API
  description: The Products API from FastSpring — 3 operation(s) for products.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/fastspring-products-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-quotes-api
  name: FastSpring Quotes API
  description: The Quotes API from FastSpring — 3 operation(s) for quotes.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Quotes
  properties:
  - type: OpenAPI
    url: openapi/fastspring-quotes-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-returns-api
  name: FastSpring Returns API
  description: The Returns API from FastSpring — 2 operation(s) for returns.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Returns
  properties:
  - type: OpenAPI
    url: openapi/fastspring-returns-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-sessions-api
  name: FastSpring Sessions API
  description: The Sessions API from FastSpring — 5 operation(s) for sessions.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Sessions
  properties:
  - type: OpenAPI
    url: openapi/fastspring-sessions-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-subscriptions-api
  name: FastSpring Subscriptions API
  description: The Subscriptions API from FastSpring — 7 operation(s) for subscriptions.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/fastspring-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
- aid: fastspring:fastspring-webhooks-api
  name: FastSpring Webhooks API
  description: The Webhooks API from FastSpring — 1 operation(s) for webhooks.
  humanURL: https://developer.fastspring.com
  baseURL: https://api.fastspring.com
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/fastspring-webhooks-api-openapi.yml
  - type: Documentation
    url: https://developer.fastspring.com/reference
  - type: GettingStarted
    url: https://developer.fastspring.com/reference/getting-started-with-your-api
  - type: Authentication
    url: https://developer.fastspring.com/reference/authentication
  - type: Webhooks
    url: https://developer.fastspring.com/reference/webhooks
  - type: Message Security
    url: https://developer.fastspring.com/reference/message-security
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/fastspring/refs/heads/main/asyncapi/fastspring-asyncapi.yml
common:
- type: AgenticAccess
  url: agentic-access/fastspring-agentic-access.yml
- type: TrustCenter
  url: security/fastspring-trust-center.yml
- type: DomainSecurity
  url: security/fastspring-domain-security.yml
- type: Authentication
  url: authentication/fastspring-authentication.yml
- type: GitHubOrganization
  url: https://github.com/FastSpring
- type: LinkedIn
  url: https://www.linkedin.com/company/fastspring
- type: Website
  url: https://fastspring.com
- type: Documentation
  url: https://developer.fastspring.com
- type: Pricing
  url: https://fastspring.com/pricing
- type: Signup
  url: https://fastspring.com/contact-sales
- type: App Dashboard
  url: https://app.fastspring.com
- type: Support
  url: https://fastspring.com/support
- type: LlmsText
  url: https://developer.fastspring.com/llms.txt
- url: https://fastspring.com/blog/feed/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com