Arch
Arch (Arch Labs, Inc.) is the digital administration platform for private markets and alternative investments. It aggregates statements, capital calls, tax documents, and data from hundreds of funds and sources into one secure portal, then uses automation and AI to extract data, summarize documents, surface insights, and coordinate workflows for limited partners, advisors, accountants, family offices, and fund service providers. The Arch Client API is a JSON HTTP REST API that lets customers programmatically access holdings, cash flows, investing/issuing entities, activities, tasks, files, and tax documents on the platform, authenticating with client-credential JWT bearer tokens. Founded in 2018, Arch is backed by Oak HC/FT, Menlo Ventures, Craft Ventures, Uncork Capital, Citi Ventures, and others.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Arch the way a machine reads it — 36 machine-readable artifacts across 1 API, 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 — Arch scores 42.9/100 (developing), with a separate agent-readiness read of 26/100 (agent aware). 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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
Put this on your own site. The badge is drawn live from Arch's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/arch/"
title="Arch on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/arch.svg"
alt="Arch Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/arch/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/arch/"
title="Arch on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/arch/card.svg"
alt="Arch Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Arch
Each block below is one kind of artifact we hold for Arch. 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 15
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.
Arch Accounts API
The Accounts API from Arch — 2 operation(s) for accounts.
Arch Activities API
Interact with Arch objects representing financial updates
Arch Addepar API
The Addepar API from Arch — 1 operation(s) for addepar.
Arch Authentication API
The Authentication API from Arch — 1 operation(s) for authentication.
Arch Cash Flows API
Read and write data relating to money inflow / outflow
Arch Firms API
Reference info about firms.
Arch Holdings API
Read holding data and push new investments.
Arch Investing Entities API
Read from and create new investing entities
Arch Issuing Entities API
Read from and create new issuing entities
Arch Lookthroughs API
Fetch data relating to the underling investments made by your own investments
Arch Offerings API
Get data on individual investment offering opportunities offered by your holdings
Arch Tasks API
The Tasks API from Arch — 6 operation(s) for tasks.
Arch Tax Documents API
The Tax Documents API from Arch — 4 operation(s) for tax documents.
Arch User Roles API
The User Roles API from Arch — 1 operation(s) for user roles.
Arch Users API
The Users API from Arch — 2 operation(s) for users.
Scroll within the panel for all 15 ·
Open Collections 16
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 COLLECTIONArch Client Accounts API
OPEN COLLECTIONArch Client Accounts Activities API
OPEN COLLECTIONArch Client Accounts Addepar API
OPEN COLLECTIONArch Client Accounts Authentication API
OPEN COLLECTIONArch Client Accounts Cash Flows API
OPEN COLLECTIONArch Client Accounts Firms API
OPEN COLLECTIONArch Client Accounts Holdings API
OPEN COLLECTIONArch Client Accounts Investing Entities API
OPEN COLLECTIONArch Client Accounts Issuing Entities API
OPEN COLLECTIONArch Client Accounts Lookthroughs API
OPEN COLLECTIONArch Client Accounts Offerings API
OPEN COLLECTIONArch Client Accounts Tasks API
OPEN COLLECTIONArch Client Accounts Tax Documents API
OPEN COLLECTIONArch Client Accounts User Roles API
OPEN COLLECTIONArch Client Accounts Users API
OPEN COLLECTIONScroll within the panel for all 16 ·
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Arch Rate Limits
RATE LIMITSSecurity Posture 3
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 Arch — 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 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
Access & Security 4
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
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/arch · machine-readable index on apis.io
This is an independent, third-party profile of Arch, 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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