Sellfy

Sellfy is an online store builder that enables creators to sell digital products, subscriptions, and physical goods directly to their audience. It offers a clean checkout with zero transaction fees and integrates with PayPal, Stripe, Apple Pay, and Google Pay. Founded in 2011 by Maris Dagis, Sellfy provides a no-code storefront, analytics, marketing tools, and instant digital delivery, helping creators monetize their work without technical barriers.

Sellfy publishes 6 API contracts indexed on the APIs.io network, including Content API, Discovery API, Feeds API, and 3 more. Tagged areas include E-Commerce, Digital Products, Software-as-a-Service, Payments, and Creators.

The Sellfy catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Sellfy’s developer surface includes changelog, documentation, API reference, getting-started guide, support, engineering blog, pricing, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

51.5/100 developing ▬ flat Agent 49/100 agent ready Heartbeat 50/100 alive Full breakdown ↓
scored 2026-11-01 · rubric v0.26.0 · Show this score on your site →

3 published contracts 3 Agent Skills

E-Commerce Digital Products Software-as-a-Service Payments Creators

What this lets a business do 1

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

Subscription Lifecycle Management

BC-4240

Licenses

GET /v1/licenses/validate/ POST /v1/licenses/activations/ POST /v1/licenses/revoke/

Kin Score

Kin Score How this is scored →
scored 2026-11-01 · rubric v0.26.0

Composite quality — 51.5/100 · developing

Contract Quality 10.9 / 19

Developer Ergonomics 7.8 / 15

Access Clarity 6.7 / 15

Operational Transparency 4.6 / 10

Contract Governance 2.0 / 9

Discoverability 5.9 / 8

Regulatory Posture 4.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 49/100 · agent ready

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 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments 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
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's

3 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 44.7 — up to +11.1 composite points
Contract Quality scores 58.1 — up to +10.5 composite points
Developer Ergonomics scores 51.7 — up to +9.7 composite points

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.

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/sellfy/apis.yml: open an issue on github.com/api-evangelist/sellfy 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 →

Standards implemented 3

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Sellfy API

Programmatic access to Sellfy stores.

Sellfy Content API

Page content in Markdown.

Sellfy Discovery API

Files that describe the site and what it offers.

Sellfy Feeds API

Sitemaps and syndication feeds.

Sellfy Licenses API

Validate, activate and revoke license keys sold with Sellfy products. A key is located by its `product_id` and `license_key` pair within your account.

Sellfy Ping API

Verify that your integration can reach the API.

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

sellfy-get-llms

AGENT SKILL

sellfy-get-pricing

AGENT SKILL

sellfy-licensing

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Sellfy Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sellfy Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Sellfy Context

7 classes · 12 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Sellfy API Rules

11 rules · 9 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 4

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Api Sellfy Openapi Overlay

0 actions · update

DERIVED

Sellfy Api Openapi Overlay

1 action · documentation · sellfy-api-openapi.json

GENERATED

Sellfy Openapi Overlay

0 actions · update

DERIVED

Sellfy Website Openapi Overlay

1 action · documentation · sellfy-website-openapi.json

GENERATED

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

LicenseActivateInput

3 properties

JSON SCHEMA

LicenseActivationResponse

3 properties

JSON SCHEMA

LicenseLookupInput

2 properties

JSON SCHEMA

LicenseStateResponse

3 properties

JSON SCHEMA

MarkdownPage

0 properties

JSON SCHEMA

PingResponse

1 properties

JSON SCHEMA

Security Posture 2

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

Sellfy Authentication

0 schemes

SECURITY

Sellfy Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Sellfy Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

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

Sellfy Agentic Access

10 operations

10 operations · 0 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

Lifecycle

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

ChangeLog

StatusPage

ChangeLog

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 4

Properties that don't map to a standard resource type

CapabilityMap

Overlay

Hosts

Vendors

Source (apis.yml)

aid: sellfy
name: Sellfy
description: Sellfy is an online store builder that enables creators to sell digital products, subscriptions, and physical
  goods directly to their audience. It offers a clean checkout with zero transaction fees and integrates with PayPal, Stripe,
  Apple Pay, and Google Pay. Founded in 2011 by Maris Dagis, Sellfy provides a no-code storefront, analytics, marketing tools,
  and instant digital delivery, helping creators monetize their work without technical barriers.
image: https://d369wu82uo9y4b.cloudfront.net/_astro/sellfy-og.DhZsN1Po.png
url: https://artifacts.apis.io/sellfy/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-28'
modified: '2026-10-28'
tags:
- E-Commerce
- Digital Products
- Software-as-a-Service
- Payments
- Creators
tags_raw:
- e-commerce
- digital-products
- SaaS
- payments
- creators
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: CapabilityMap
  url: capabilities/sellfy-capability-edges.yml
  name: Sellfy Business Capability Map
- type: AgenticAccess
  url: agentic-access/sellfy-agentic-access.yml
- type: Spectral
  url: rules/sellfy-rules.yml
- type: Vocabulary
  url: vocabulary/sellfy-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: ChangeLog
  url: changelog/sellfy-changelog.yml
- type: StatusPage
  url: https://status.sellfy.com
- type: Lifecycle
  url: lifecycle/sellfy-lifecycle.yml
- type: ErrorCatalog
  url: errors/sellfy-problem-types.yml
- type: Conformance
  url: conformance/sellfy-conformance.yml
- type: Overlay
  url: overlays/sellfy-api-openapi-overlay.yaml
- type: LLMsTxt
  url: llms/sellfy-llms.txt
- type: WellKnown
  url: well-known/sellfy-well-known.yml
- type: Hosts
  url: hosts/sellfy-hosts.yml
- type: Vendors
  url: vendors/sellfy-vendors.yml
- type: Security
  url: https://sellfy.com/security/
- type: ChangeLog
  url: https://sellfy.com/changelog/
- type: GitHubOrganization
  url: https://github.com/Sellfy
- type: DomainSecurity
  url: security/sellfy-domain-security.yml
- type: Website
  url: https://sellfy.com/
- type: Documentation
  url: https://docs.sellfy.com/
- type: DeveloperPortal
  url: https://api.sellfy.com/
- type: APIReference
  url: https://api.sellfy.com/
- type: GettingStarted
  url: https://docs.sellfy.com/category/372-quick-start-guide
- type: Support
  url: https://docs.sellfy.com/#contact
- type: Blog
  url: https://sellfy.com/blog/
- type: Pricing
  url: https://sellfy.com/pricing/
- type: SignUp
  url: https://sellfy.com/auth/signup/
- type: TermsOfService
  url: https://sellfy.com/terms/
- type: PrivacyPolicy
  url: https://sellfy.com/privacy/
apis:
- name: Sellfy API
  humanURL: https://api.sellfy.com/
  baseURL: https://api.sellfy.com/
  description: Programmatic access to Sellfy stores.
  tags:
  - E-Commerce
  - Digital Products
  - Payments
  tags_raw:
  - e-commerce
  - digital-products
  - payments
  aid: sellfy:sellfy-api
- aid: sellfy:sellfy-content-api
  name: Sellfy Content API
  description: Page content in Markdown.
  humanURL: https://api.sellfy.com/
  baseURL: https://sellfy.com
  tags:
  - Content
  properties:
  - type: OpenAPI
    url: openapi/sellfy-content-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sellfy-markdown-page-schema.json
- aid: sellfy:sellfy-discovery-api
  name: Sellfy Discovery API
  description: Files that describe the site and what it offers.
  humanURL: https://api.sellfy.com/
  baseURL: https://sellfy.com
  tags:
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/sellfy-discovery-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sellfy-markdown-page-schema.json
- aid: sellfy:sellfy-feeds-api
  name: Sellfy Feeds API
  description: Sitemaps and syndication feeds.
  humanURL: https://api.sellfy.com/
  baseURL: https://sellfy.com
  tags:
  - Feed
  tags_raw:
  - Feeds
  properties:
  - type: OpenAPI
    url: openapi/sellfy-feeds-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sellfy-markdown-page-schema.json
- aid: sellfy:sellfy-licenses-api
  name: Sellfy Licenses API
  description: Validate, activate and revoke license keys sold with Sellfy products. A key is located by its `product_id`
    and `license_key` pair within your account.
  humanURL: https://api.sellfy.com/
  baseURL: https://api.sellfy.com
  tags:
  - Licenses
  properties:
  - type: OpenAPI
    url: openapi/sellfy-licenses-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sellfy-markdown-page-schema.json
- aid: sellfy:sellfy-ping-api
  name: Sellfy Ping API
  description: Verify that your integration can reach the API.
  humanURL: https://api.sellfy.com/
  baseURL: https://api.sellfy.com
  tags:
  - Ping
  properties:
  - type: OpenAPI
    url: openapi/sellfy-ping-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sellfy-markdown-page-schema.json
x-submission-probe: 200 2026-10-26
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-28'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://sellfy.com/openapi.json
    status: null
  - url: https://api.sellfy.com/openapi.json
    status: null
  - url: https://api.sellfy.com/mcp
    status: 401
  - url: https://static.sellfy.com/mcp
    status: 403
  - url: https://sellfy.com/
    status: 200
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 34
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Sellfy API — frequently asked questions

Does Sellfy have an API?

Yes. APIs.io lists 6 APIs from Sellfy, including Sellfy API, Sellfy Content API and Sellfy Discovery API, and 3 more.

Is there an OpenAPI specification for the Sellfy API?

Yes. APIs.io indexes 5 OpenAPI specifications for Sellfy, each linked for download from this page.

How do I authenticate with the Sellfy API?

Sellfy documents its authentication (0 schemes). The details are profiled on APIs.io as Sellfy Authentication.

Is the Sellfy API ready for AI agents?

Sellfy has a Kin Score of 51.5 out of 100 (developing) and an Agent Readiness score of 48.6 (agent-ready), scored by API Evangelist on 2026-11-01.

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