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 APIs 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.

Aqueduct’s developer surface includes documentation, API reference, getting-started guide, authentication, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub

28.7/100 thin ▬ flat Agent 29/100 agent ready Full breakdown ↓
scored 2026-08-30 · rubric v0.17.2

AccessSelf serve

1 APIs 1 MCP Servers

Company Fintech Billing Invoicing Metering Usage-Based Subscription Payments

Kin Score

Kin Score How this is scored →
scored 2026-08-30 · rubric v0.17.2

Composite quality — 28.7/100 · thin

Contract Quality 11.8 / 21

Developer Ergonomics 5.6 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.9 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 4.0 / 15

Agent readiness — 29/100 · 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 Surface 0 / 5

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.

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/.

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/aqueduct: 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 10

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

Open Collections 11

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

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

MCPServer

LLMsTxt

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 1

Properties that don't map to a standard resource type

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: 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://files.readme.io/9e3d7fe-small-Logo_4.png
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
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:
  - 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:
  - 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-invoicelineitem-api
  name: Aqueduct InvoiceLineItem API
  description: The InvoiceLineItem API from Aqueduct — 1 operation(s) for invoicelineitem.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  tags:
  - InvoiceLineItem
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-invoicelineitem-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
common:
- 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: MCPServer
  url: mcp/aqueduct-mcp.yml
- 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

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