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 1 API on the APIs.io network. 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

31.9/100 thin Agent 72/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4

1 APIs 1 MCP Servers 0 Features

CompanyFintechBillingInvoicingMeteringUsage-BasedSubscriptionsPaymentsAPI

API Rating

API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4

Composite quality — 31.9/100 · thin

Contract Quality 9.4 / 25

Developer Ergonomics 12.2 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 1.0 / 13

Governance 0.0 / 12

Discoverability 9.3 / 10

Agent readiness — 72/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 15 / 15

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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

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 →

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

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'
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:
- name: Aqueduct API
  description: REST API to bill, invoice, and quote for usage-based business models — account owners, price models, billable
    events, invoices, line items, products, subscriptions, provisioning, and webhooks.
  humanURL: https://docs.tryaqueduct.com/reference
  baseURL: https://api.tryaqueduct.com/v1
  properties:
  - type: OpenAPI
    url: openapi/aqueduct-openapi.json
  - 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: Overlay
    url: overlays/aqueduct-openapi-overlay.yaml
  - 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

Aqueduct

API Rating

APIs

Aqueduct API

MCP Servers

aqueduct-mcp.yml

Event Specifications

Aqueduct Webhooks

Resources