Aqueduct website screenshot

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 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.8/100 thin ▬ flat Agent 43/100 agent ready Full breakdown ↓
scored 2026-08-10 · rubric v0.9.1
AccessSelf serve
10 APIs 1 MCP Servers
CompanyFintechBillingInvoicingMeteringUsage-BasedSubscriptionsPaymentsAPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-10 · rubric v0.9.1
Composite quality — 35.8/100 · thin
Contract Quality 15.8 / 25
Developer Ergonomics 9.9 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 1.0 / 13
Governance 1.4 / 12
Discoverability 9.3 / 10
Agent readiness — 43/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 12 / 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
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.

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 InvoiceLineItem API

The InvoiceLineItem API from Aqueduct — 1 operation(s) for invoicelineitem.

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.

Scroll for all 10

MCP Servers 1

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

aqueduct-mcp.yml

MCP SERVER

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

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

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
 MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 AgenticAccess
AgenticAccess

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 Webhooks
Webhooks
 Conformance
Conformance
 Lifecycle
Lifecycle

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
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'
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: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- 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
  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:
  - 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:
  - 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:
  - 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: 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