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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Aqueduct the way a machine reads it — 26 machine-readable artifacts across 10 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Aqueduct scores 34.3/100 (thin), with a separate agent-readiness read of 43/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
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How we profile Aqueduct
Each block below is one kind of artifact we hold for Aqueduct. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 10
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 within the panel for all 10 ·
Open Collections 11
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONAqueduct API Reference AccountOwner API
OPEN COLLECTIONAqueduct API Reference AccountOwner Bill API
OPEN COLLECTIONAqueduct API Reference AccountOwner Invoice API
OPEN COLLECTIONAqueduct API Reference AccountOwner InvoiceLineItem API
OPEN COLLECTIONAqueduct API Reference AccountOwner PriceModel API
OPEN COLLECTIONAqueduct API Reference AccountOwner ProductPurchases API
OPEN COLLECTIONAqueduct API Reference AccountOwner Products API
OPEN COLLECTIONAqueduct API Reference AccountOwner Provisioning API
OPEN COLLECTIONAqueduct API Reference AccountOwner Subscriptions API
OPEN COLLECTIONAqueduct API Reference AccountOwner Webhooks API
OPEN COLLECTIONScroll within the panel for all 11 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
aqueduct-mcp.yml
MCP SERVEREvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
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...
ASYNCAPISecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Aqueduct — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Access & Security 2
Authentication, authorization, and security posture
Company 1
The organization behind the API
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/aqueduct · machine-readable index on apis.io
This is an independent, third-party profile of Aqueduct, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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