Subbly

Subbly is a subscription-first commerce platform for building and running subscription boxes, memberships, and recurring-product businesses without code. Alongside the no-code storefront and merchant admin, Subbly ships a developer surface for headless and custom builds: the SubblyCart.js embeddable cart widget and the Subbly.js SDK (@subbly/sdk), a browser-side client that talks to Subbly's REST backend to manage products, bundles, carts, checkout and purchase, customers, and subscriptions. Subbly also exposes a public Orders API for integrating directly with any 3PL / fulfillment provider (documentation is provided by Subbly on request), plus an in-app webhook platform for notifying external services of order and subscription events. Subbly does not publish a fully open, self-serve REST reference or an OpenAPI definition; the SDK abstracts the underlying endpoints, so the API surface modeled here is derived from the documented SDK operations and is flagged as modeled.

Subbly publishes 6 API contracts indexed on the APIs.io network, including Cart API, Customers API, Products API, and 3 more. Tagged areas include Subscription, Subscription Commerce, E-Commerce, Subscription Box, and Recurring Billing.

The Subbly catalog on APIs.io includes 1 Spectral governance ruleset.

Subbly’s developer surface includes engineering blog, authentication, documentation, SDKs, pricing, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

18.7/100 emerging ▬ flat Agent 19/100 agent aware Front door AI 4/6 moderate Heartbeat 99/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract

Subscription Subscription Commerce E-Commerce Subscription Box Recurring Billing Headless Commerce SDK Webhook

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Subscription Lifecycle Management

BC-4240

Subscriptions

GET /subscriptions PATCH /subscriptions/{id}

Customer Relationship Management

BC-420

Customers

POST /customers GET /customers/{id} GET /customers/{id}/addresses

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 18.7/100 · emerging

Contract Quality 0.0 / 19

Developer Ergonomics 7.1 / 15

Access Clarity 2.2 / 15

Operational Transparency 0.7 / 10

Contract Governance 1.2 / 9

Discoverability 4.3 / 8

Regulatory Posture 0.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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 7 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

10 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →
Operational Transparency scores 7.1 — up to +12.1 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/subbly/apis.yml: open an issue on github.com/api-evangelist/subbly to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Billing, Subscriptions and Monetization	long-tail	2.5 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Subbly Orders API

Public Orders API for integrating Subbly orders directly with any third-party logistics (3PL) / fulfillment provider. Subbly states it will provide the Orders API documentation ...

Subbly Webhooks

In-app webhook platform that notifies external and internal services of Subbly events (order and subscription lifecycle) with configurable conditions and variables. Webhooks are...

Subbly Cart API

Cart and checkout operations (modeled from the SDK and SubblyCart.js).

Subbly Customers API

Customer accounts, addresses, and payment methods (modeled from the SDK).

Subbly Products API

Storefront products and bundles (modeled from the SDK).

Subbly Subscriptions API

Customer subscriptions and preferences (modeled from the SDK).

Open Collections 5

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

Subbly Storefront API (Modeled) Cart API

OPEN COLLECTION

Subbly Storefront API (Modeled) Cart Customers API

OPEN COLLECTION

Subbly Storefront API (Modeled) Cart Products API

OPEN COLLECTION

Subbly Storefront API (Modeled) Cart Subscriptions API

OPEN COLLECTION

Subbly Storefront API (Modeled)

OPEN COLLECTION

Subbly API pricing

Not yet checked against Subbly's own pricing page. Compiled by API Evangelist on 2026-07-10 from www.subbly.co/pricing; confirm before you rely on a figure.

Plan	Price
Lite paid	—
Basic paid	—
Subbly paid	—
Advanced paid	—
Subbly X (Enterprise) enterprise	—

Plan details, limits and sources →

Rate limits

Storefront SDK / Cart Requests: not published requests
Orders API (3PL): not published requests
Webhook Delivery: not published events

Compiled by API Evangelist, not yet checked against Subbly's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Subbly Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Subbly Rate Limits

3 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Subbly Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Subbly API Rules

56 rules · 49 error-severity 5 warn-severity 2 info-severity

SPECTRAL

Security Posture 2

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

Subbly Authentication

apiKey · 1 scheme

SECURITY

Subbly Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Subbly Agentic Access

21 operations · 10 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

SDK

SDK

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

SupportHelpCenter

SupportHelpCenter

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 5

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: subbly
url: https://raw.githubusercontent.com/api-evangelist/subbly/refs/heads/main/apis.yml
name: Subbly
kind: company
description: 'Subbly is a subscription-first commerce platform for building and running subscription boxes, memberships, and
  recurring-product businesses without code. Alongside the no-code storefront and merchant admin, Subbly ships a developer
  surface for headless and custom builds: the SubblyCart.js embeddable cart widget and the Subbly.js SDK (@subbly/sdk), a
  browser-side client that talks to Subbly''s REST backend to manage products, bundles, carts, checkout and purchase, customers,
  and subscriptions. Subbly also exposes a public Orders API for integrating directly with any 3PL / fulfillment provider
  (documentation is provided by Subbly on request), plus an in-app webhook platform for notifying external services of order
  and subscription events. Subbly does not publish a fully open, self-serve REST reference or an OpenAPI definition; the SDK
  abstracts the underlying endpoints, so the API surface modeled here is derived from the documented SDK operations and is
  flagged as modeled.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/subbly.png
x-docs-platform: zudoku
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Subscription
- Subscription Commerce
- E-Commerce
- Subscription Box
- Recurring Billing
- Headless Commerce
- SDK
- Webhook
tags_raw:
- Subscriptions
- Subscription Commerce
- Ecommerce
- Subscription Box
- Recurring Billing
- Headless Commerce
- SDK
- Webhooks
created: '2026-07-10'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: subbly:subbly-orders-api
  name: Subbly Orders API
  tags:
  - Order
  - Fulfillment
  - 3PL
  tags_raw:
  - Orders
  - Fulfillment
  - 3PL
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.subbly.dev/
  properties:
  - url: https://www.subbly.dev/
    type: Documentation
  - url: https://support.subbly.co/app-store/how-does-the-ship-station-integration-work
    type: Documentation
  description: Public Orders API for integrating Subbly orders directly with any third-party logistics (3PL) / fulfillment
    provider. Subbly states it will provide the Orders API documentation on request rather than publishing it openly, so this
    is a real but access-gated API - no endpoints are modeled here because Subbly's request/response contract is not publicly
    documented.
- aid: subbly:subbly-webhooks
  name: Subbly Webhooks
  tags:
  - Webhook
  - Event
  - Automation
  tags_raw:
  - Webhooks
  - Events
  - Automation
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.subbly.co/product
  properties:
  - url: https://www.subbly.co/product
    type: Documentation
  - url: https://www.subbly.co/all-features
    type: Documentation
  description: In-app webhook platform that notifies external and internal services of Subbly events (order and subscription
    lifecycle) with configurable conditions and variables. Webhooks are configured in the Subbly admin rather than via a published
    subscription API, and Subbly does not publish a formal event catalog or payload schema, so no webhook schemas are modeled
    here.
- aid: subbly:subbly-cart-api
  name: Subbly Cart API
  description: Cart and checkout operations (modeled from the SDK and SubblyCart.js).
  humanURL: https://docs.subbly.dev/reference/subbly-sdk/
  tags:
  - Cart
  properties:
  - type: OpenAPI
    url: openapi/subbly-cart-api-openapi.yml
  - type: Documentation
    url: https://docs.subbly.dev/reference/subbly-sdk/
  - type: APIReference
    url: https://www.subbly.dev/
  - type: Documentation
    url: https://docs.subbly.dev/reference/cart/
  - type: Documentation
    url: https://docs.subbly.dev/docs/installation/
- aid: subbly:subbly-customers-api
  name: Subbly Customers API
  description: Customer accounts, addresses, and payment methods (modeled from the SDK).
  humanURL: https://docs.subbly.dev/reference/subbly-sdk/
  tags:
  - Customers
  properties:
  - type: OpenAPI
    url: openapi/subbly-customers-api-openapi.yml
  - type: Documentation
    url: https://docs.subbly.dev/reference/subbly-sdk/
  - type: APIReference
    url: https://www.subbly.dev/
  - type: Documentation
    url: https://docs.subbly.dev/reference/cart/
  - type: Documentation
    url: https://docs.subbly.dev/docs/installation/
- aid: subbly:subbly-products-api
  name: Subbly Products API
  description: Storefront products and bundles (modeled from the SDK).
  humanURL: https://docs.subbly.dev/reference/subbly-sdk/
  tags:
  - Product
  tags_raw:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/subbly-products-api-openapi.yml
  - type: Documentation
    url: https://docs.subbly.dev/reference/subbly-sdk/
  - type: APIReference
    url: https://www.subbly.dev/
  - type: Documentation
    url: https://docs.subbly.dev/reference/cart/
  - type: Documentation
    url: https://docs.subbly.dev/docs/installation/
- aid: subbly:subbly-subscriptions-api
  name: Subbly Subscriptions API
  description: Customer subscriptions and preferences (modeled from the SDK).
  humanURL: https://docs.subbly.dev/reference/subbly-sdk/
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/subbly-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://docs.subbly.dev/reference/subbly-sdk/
  - type: APIReference
    url: https://www.subbly.dev/
  - type: Documentation
    url: https://docs.subbly.dev/reference/cart/
  - type: Documentation
    url: https://docs.subbly.dev/docs/installation/
common:
- url: https://www.subbly.co/blog/
  type: Blog
- url: https://www.subbly.co/blog/feed/
  type: BlogRSS
- type: CapabilityMap
  url: capabilities/subbly-capability-edges.yml
  name: Subbly Business Capability Map
- type: AgenticAccess
  url: agentic-access/subbly-agentic-access.yml
- type: DomainSecurity
  url: security/subbly-domain-security.yml
- type: Authentication
  url: authentication/subbly-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/subbly
- type: Website
  url: https://www.subbly.co/
- type: Documentation
  url: https://docs.subbly.dev/
- type: DeveloperPortal
  url: https://www.subbly.dev/
- type: SDK
  url: https://docs.subbly.dev/reference/subbly-sdk/
- type: Pricing
  url: https://www.subbly.co/pricing
- type: Plans
  url: plans/subbly-plans-pricing.yml
- type: RateLimits
  url: rate-limits/subbly-rate-limits.yml
- type: FinOps
  url: finops/subbly-finops.yml
- type: SupportHelpCenter
  url: https://support.subbly.co/
- url: https://www.subbly.co/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Subbly API — frequently asked questions

Does Subbly have an API?

Yes. APIs.io lists 6 APIs from Subbly, including Subbly Orders API, Subbly Webhooks and Subbly Cart API, and 3 more.

Is there an OpenAPI specification for the Subbly API?

Yes. APIs.io indexes 4 OpenAPI specifications for Subbly, each linked for download from this page.

How do I authenticate with the Subbly API?

Subbly uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Subbly Authentication.

How much does the Subbly API cost?

APIs.io lists 5 pricing plans for Subbly, with each plan's price, limits and inclusions under Pricing on this page.

Is the Subbly API ready for AI agents?

Subbly has a Kin Score of 18.7 out of 100 (emerging) and an Agent Readiness score of 19.0 (agent-aware), scored by API Evangelist on 2026-11-13.

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