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 — 21 machine-readable artifacts across 15 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 — Arch scores 48.4/100 (developing), with a separate agent-readiness read of 64/100 (agent native). 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 2026-07-27 · rubric v0.5
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 ·
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.
arch-mcp.yml
MCP SERVERRate 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