Aqueduct

Aqueduct is a fintech billing platform that equips B2B businesses with billing, invoicing, quoting, and accounting for usage-based and metered business models. Developers configure how they collect money as a PriceModel (composed of price functions such as per-unit meters), send billable usage events, and let Aqueduct create invoices and subscriptions, send invoices by email, issue refunds, and auto-provision access via signed webhooks. The REST API lives at api.tryaqueduct.com/v1 with API-key authentication and a documented Idempotency-Key contract. Founded 2020 in Bellevue, WA and backed by Bain Capital Ventures and Conversion Capital, Aqueduct was acquired by Stripe in August 2024; its ReadMe developer portal at docs.tryaqueduct.com remains live.

Aqueduct publishes 10 API contracts indexed on the APIs.io network, including AccountOwner API, Bill API, Invoice API, and 7 more. Tagged areas include Company, Fintech, Billing, Invoicing, and Metering.

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

Aqueduct’s developer surface includes documentation, API reference, getting-started guide, authentication, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.1/100 thin ▬ flat Agent 30/100 agent ready Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company Fintech Billing Invoicing Metering Usage-Based Subscription Payments

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 Billing & Revenue Management

BC-4250

BillInvoiceInvoice Line ItemPriceModel

POST /invoices POST /invoices/{invoiceId}/send POST /invoices/{invoiceId}/void POST /invoicelineitems/{lineItemId}

Subscription Lifecycle Management

BC-4240

Subscriptions

GET /subscriptions POST /subscriptions/{subscriptionId} DELETE /subscriptions/{subscriptionId}

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 31.1/100 · thin

Contract Quality 9.5 / 19

Developer Ergonomics 4.9 / 15

Access Clarity 0.0 / 15

Operational Transparency 0.8 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.3 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 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 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 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
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

6 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 32.7 — up to +13.5 composite points
Contract Quality scores 50.5 — up to +12.4 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/aqueduct/apis.yml: open an issue on github.com/api-evangelist/aqueduct 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	undeclared	-	-	-

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 10

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

Aqueduct AccountOwner API

The AccountOwner API from Aqueduct — 3 operation(s) for accountowner.

Aqueduct Bill API

The Bill API from Aqueduct — 2 operation(s) for bill.

Aqueduct Invoice API

The Invoice API from Aqueduct — 6 operation(s) for invoice.

Aqueduct PriceModel API

The PriceModel API from Aqueduct — 3 operation(s) for pricemodel.

Aqueduct ProductPurchases API

The ProductPurchases API from Aqueduct — 1 operation(s) for productpurchases.

Aqueduct Products API

The Products API from Aqueduct — 2 operation(s) for products.

Aqueduct Provisioning API

The Provisioning API from Aqueduct — 1 operation(s) for provisioning.

Aqueduct Subscriptions API

The Subscriptions API from Aqueduct — 2 operation(s) for subscriptions.

Aqueduct Webhooks API

The Webhooks API from Aqueduct — 1 operation(s) for webhooks.

Aqueduct Invoice Line Item API

The Invoice Line Item API from Aqueduct — 1 operation(s) for invoice line item.

Scroll for all 10

Open Collections 10

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

Aqueduct API Reference AccountOwner API

OPEN COLLECTION

Aqueduct API Reference AccountOwner Bill API

OPEN COLLECTION

Aqueduct API Reference AccountOwner Invoice API

OPEN COLLECTION

Aqueduct API Reference AccountOwner InvoiceLineItem API

OPEN COLLECTION

Aqueduct API Reference AccountOwner PriceModel API

OPEN COLLECTION

Aqueduct API Reference AccountOwner ProductPurchases API

OPEN COLLECTION

Aqueduct API Reference AccountOwner Products API

OPEN COLLECTION

Aqueduct API Reference AccountOwner Provisioning API

OPEN COLLECTION

Aqueduct API Reference AccountOwner Subscriptions API

OPEN COLLECTION

Aqueduct API Reference AccountOwner Webhooks API

OPEN COLLECTION

Scroll for all 10

Agent Skills 3

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

Issue and collect an invoice on Aqueduct

AGENT SKILL

Set up usage-based billing on Aqueduct

AGENT SKILL

Auto-provision on Aqueduct webhooks

AGENT SKILL

Event Specifications 1

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

Aqueduct Webhooks

Event notifications delivered by Aqueduct to registered webhook endpoints. Each event is an HTTP POST carrying the shared envelope. Subscribe by creating a webhook endpoint (POS...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Aqueduct API Rules

50 rules · 42 errors 7 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

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.

Aqueduct Openapi Overlay

3 actions · update · aqueduct-openapi.json

DERIVED

Security Posture 2

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

Aqueduct Authentication

apiKey · 1 scheme

SECURITY

Aqueduct Domain Security

DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Aqueduct Agentic Access

32 operations · 19 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

AsyncAPI

AsyncAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgenticAccess

AgenticAccess

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

Webhooks

Conformance

Lifecycle

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

aid: aqueduct
name: Aqueduct
description: Aqueduct is a fintech billing platform that equips B2B businesses with billing, invoicing, quoting, and accounting
  for usage-based and metered business models. Developers configure how they collect money as a PriceModel (composed of price
  functions such as per-unit meters), send billable usage events, and let Aqueduct create invoices and subscriptions, send
  invoices by email, issue refunds, and auto-provision access via signed webhooks. The REST API lives at api.tryaqueduct.com/v1
  with API-key authentication and a documented Idempotency-Key contract. Founded 2020 in Bellevue, WA and backed by Bain Capital
  Ventures and Conversion Capital, Aqueduct was acquired by Stripe in August 2024; its ReadMe developer portal at docs.tryaqueduct.com
  remains live.
url: https://raw.githubusercontent.com/api-evangelist/aqueduct/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- bain-capital-ventures
x-tier: enriched
x-tier-reason: portfolio-lead
x-acquired-by: stripe
x-acquired-date: '2024-08-03'
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://files.readme.io/9e3d7fe-small-Logo_4.png
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-09-19
tags:
- Company
- Fintech
- Billing
- Invoicing
- Metering
- Usage-Based
- Subscription
- Payments
tags_raw:
- Company
- Fintech
- Billing
- Invoicing
- Metering
- Usage-Based
- Subscriptions
- Payments
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: aqueduct:aqueduct-accountowner-api
  name: Aqueduct AccountOwner API
  description: The AccountOwner API from Aqueduct — 3 operation(s) for accountowner.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - AccountOwner
  tags_raw:
  - AccountOwner
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-accountowner-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-bill-api
  name: Aqueduct Bill API
  description: The Bill API from Aqueduct — 2 operation(s) for bill.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - Bills
  tags_raw:
  - Bill
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-bill-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-invoice-api
  name: Aqueduct Invoice API
  description: The Invoice API from Aqueduct — 6 operation(s) for invoice.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - Invoices
  tags_raw:
  - Invoice
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-invoice-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-pricemodel-api
  name: Aqueduct PriceModel API
  description: The PriceModel API from Aqueduct — 3 operation(s) for pricemodel.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - PriceModel
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-pricemodel-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-productpurchases-api
  name: Aqueduct ProductPurchases API
  description: The ProductPurchases API from Aqueduct — 1 operation(s) for productpurchases.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - ProductPurchases
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-productpurchases-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-products-api
  name: Aqueduct Products API
  description: The Products API from Aqueduct — 2 operation(s) for products.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - Product
  tags_raw:
  - Products
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-products-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-provisioning-api
  name: Aqueduct Provisioning API
  description: The Provisioning API from Aqueduct — 1 operation(s) for provisioning.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - Provisioning
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-provisioning-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-subscriptions-api
  name: Aqueduct Subscriptions API
  description: The Subscriptions API from Aqueduct — 2 operation(s) for subscriptions.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-webhooks-api
  name: Aqueduct Webhooks API
  description: The Webhooks API from Aqueduct — 1 operation(s) for webhooks.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-webhooks-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
- aid: aqueduct:aqueduct-invoice-line-item-api
  name: Aqueduct Invoice Line Item API
  description: The Invoice Line Item API from Aqueduct — 1 operation(s) for invoice line item.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - InvoiceLineItem
  tags_raw:
  - Invoice Line Item
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-invoice-line-item-api-openapi.yml
  - type: Documentation
    url: https://docs.tryaqueduct.com/reference
  - type: APIReference
    url: https://docs.tryaqueduct.com/reference
  - type: GettingStarted
    url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
  - type: DataModel
    url: data-model/aqueduct-data-model.yml
common:
- type: CapabilityMap
  url: capabilities/aqueduct-capability-edges.yml
  name: Aqueduct Business Capability Map
- type: Overlay
  url: overlays/aqueduct-openapi-overlay.yaml
- type: DeveloperPortal
  url: https://docs.tryaqueduct.com/reference
- type: Documentation
  url: https://docs.tryaqueduct.com/reference
- type: APIReference
  url: https://docs.tryaqueduct.com/reference
- type: GettingStarted
  url: https://docs.tryaqueduct.com/reference/getting-started-with-your-api
- type: Authentication
  url: authentication/aqueduct-authentication.yml
- type: Conventions
  url: conventions/aqueduct-conventions.yml
- type: Idempotency
  url: conventions/aqueduct-conventions.yml
- type: Webhooks
  url: asyncapi/aqueduct-webhooks-asyncapi.yml
- type: AsyncAPI
  url: asyncapi/aqueduct-webhooks-asyncapi.yml
- type: AgentSkill
  url: skills/_index.yml
- type: X-MCPServerCandidate
  url: mcp/aqueduct-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/aqueduct-llms.txt
- type: Conformance
  url: conformance/aqueduct-conformance.yml
- type: Lifecycle
  url: lifecycle/aqueduct-lifecycle.yml
- type: DomainSecurity
  url: security/aqueduct-domain-security.yml
- type: AgenticAccess
  url: agentic-access/aqueduct-agentic-access.yml
- type: Website
  url: https://www.tryaqueduct.com/
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Aqueduct API — frequently asked questions

Does Aqueduct have an API?

Yes. APIs.io lists 10 APIs from Aqueduct, including Aqueduct AccountOwner API, Aqueduct Bill API and Aqueduct Invoice API, and 7 more.

Is there an OpenAPI specification for the Aqueduct API?

Yes. APIs.io indexes 10 OpenAPI specifications for Aqueduct, each linked for download from this page.

How do I authenticate with the Aqueduct API?

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

Is the Aqueduct API ready for AI agents?

Aqueduct has a Kin Score of 31.1 out of 100 (thin) and an Agent Readiness score of 29.7 (agent-ready), scored by API Evangelist on 2026-11-02.

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