Autumn (autumn-js, billing)

Autumn provides an open-source billing infrastructure built on top of Stripe, offering usage‑based billing, credits, entitlements, and subscription state through a simple API. It serves AI startups and other SaaS companies needing a unified system of record for subscriptions, metering, and feature access, while delegating payment processing to Stripe. The platform includes endpoints such as attach, check, and track, and is documented with quickstart guides and API references.

Autumn (autumn-js, billing) is listed with 1 API on the APIs.io network. Tagged areas include Company, Billing, Open-Source, Stripe, and AI-Startups.

Autumn (autumn-js, billing)’s developer surface includes getting-started guide, changelog, documentation, API reference, engineering blog, pricing, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

26.6/100 thin Agent 27/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 API

Company BillingOpen-SourceStripeAI-Startups

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 26.6/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 8.1 / 17

Access Clarity 3.6 / 17

Operational Transparency 5.2 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 2.4 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 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 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

7 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
Access Clarity scores 21.1 — up to +15.8 composite points
Contract Governance scores 0.0 — up to +12.0 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/autumn/apis.yml: open an issue on github.com/api-evangelist/autumn 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 →

APIs 1

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

Autumn Billing API

Autumn provides an open-source billing API built on top of Stripe, offering usage‑based billing, credits, entitlements, and subscription management.

Security Posture 1

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

Autumn Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

DeveloperPortal

DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

SecurityTxt

SecurityTxt

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

PrivacyPolicy

PrivacyPolicy

Pricing

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: autumn
name: Autumn (autumn-js, billing)
image: https://useautumn.com/images/og-image.png
description: Autumn provides an open-source billing infrastructure built on top of Stripe, offering usage‑based billing, credits,
  entitlements, and subscription state through a simple API. It serves AI startups and other SaaS companies needing a unified
  system of record for subscriptions, metering, and feature access, while delegating payment processing to Stripe. The platform
  includes endpoints such as attach, check, and track, and is documented with quickstart guides and API references.
url: https://raw.githubusercontent.com/api-evangelist/autumn/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-26 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-26'
modified: '2026-10-26'
tags:
- Company
- Billing
- Open-Source
- Stripe
- AI-Startups
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: GettingStarted
  url: https://docs.useautumn.com/documentation/getting-started/migration
- type: LLMsTxt
  url: llms/autumn-llms.txt
- type: AgentCard
  url: a2a/autumn-a2a.yml
- type: SecurityTxt
  url: well-known/autumn-vercel-security.txt
- type: WellKnown
  url: well-known/autumn-well-known.yml
- type: Hosts
  url: hosts/autumn-hosts.yml
- type: Vendors
  url: vendors/autumn-vendors.yml
- type: SDKs
  url: packages/autumn-packages.yml
- type: Packages
  url: packages/autumn-packages.yml
- type: StatusPage
  url: https://status.useautumn.com/
- type: PrivacyPolicy
  url: https://useautumn.com/privacy
- type: ChangeLog
  url: https://docs.useautumn.com/changelog/changelog
- type: DeveloperPortal
  url: https://api.useautumn.com`
- type: DomainSecurity
  url: security/autumn-domain-security.yml
- type: Website
  url: https://useautumn.com/
- type: Documentation
  url: https://docs.useautumn.com/
- type: APIReference
  url: https://docs.useautumn.com/api-reference
- type: Blog
  url: https://useautumn.com/blog
- type: GitHubOrganization
  url: https://github.com/useautumn
- type: Pricing
  url: https://useautumn.com/pricing
apis:
- name: Autumn Billing API
  description: Autumn provides an open-source billing API built on top of Stripe, offering usage‑based billing, credits, entitlements,
    and subscription management.
  humanURL: https://docs.useautumn.com/api-reference
  baseURL: https://api.useautumn.com/v1
  aid: autumn:autumn-billing-api
x-submission-probe: 200 2026-10-25
x-coverage:
  state: gated
  reason: partner-login
  detail: OpenAPI spec at https://api.useautumn.com/openapi.json requires authentication, returning 401.
  evidence:
  - url: https://api.useautumn.com/openapi.json
    status: 401
  checked: '2026-10-26'
x-enrichment:
  date: '2026-10-26'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Autumn (autumn-js, billing) API — frequently asked questions

Does Autumn (autumn-js, billing) have an API?

Yes. APIs.io lists 1 API from Autumn (autumn-js, billing), including Autumn Billing API.

Is the Autumn (autumn-js, billing) API ready for AI agents?

Autumn (autumn-js, billing) has a Kin Score of 26.6 out of 100 (thin) and an Agent Readiness score of 27.3 (agent-aware), scored by API Evangelist on 2026-10-31.

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