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.

Arch publishes 15 APIs on the APIs.io network, including Accounts API, Activities API, Addepar API, and 12 more. Tagged areas include Company, Private Markets, Alternative Investments, Fintech, and Wealth Management.

Arch’s developer surface includes authentication, documentation, API reference, getting-started guide, support, signup flow, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub

42.9/100 developing ▬ flat Agent 26/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs

Company Private Markets Alternative Investments Fintech Wealth ManagementInvestment AdministrationPortfolio-Management Documents

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 42.9/100 · developing

Contract Quality 10.9 / 23

Developer Ergonomics 10.2 / 18

Access Clarity 9.0 / 18

Operational Transparency 1.8 / 12

Contract Governance 0.5 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/arch: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 15

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 for all 15

Open Collections 16

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Arch Client Accounts API

OPEN COLLECTION

Arch Client Accounts Activities API

OPEN COLLECTION

Arch Client Accounts Addepar API

OPEN COLLECTION

Arch Client Accounts Authentication API

OPEN COLLECTION

Arch Client Accounts Cash Flows API

OPEN COLLECTION

Arch Client Accounts Firms API

OPEN COLLECTION

Arch Client Accounts Holdings API

OPEN COLLECTION

Arch Client Accounts Investing Entities API

OPEN COLLECTION

Arch Client Accounts Issuing Entities API

OPEN COLLECTION

Arch Client Accounts Lookthroughs API

OPEN COLLECTION

Arch Client Accounts Offerings API

OPEN COLLECTION

Arch Client Accounts Tasks API

OPEN COLLECTION

Arch Client Accounts Tax Documents API

OPEN COLLECTION

Arch Client Accounts User Roles API

OPEN COLLECTION

Arch Client Accounts Users API

OPEN COLLECTION

Scroll for all 16

Rate Limits 1

Documented rate limits and quota policies.

Arch Rate Limits

0 limits

RATE LIMITS

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Arch Authentication

http · 1 scheme

SECURITY

Arch Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Arch Trust Center

trust center published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Arch Agentic Access

52 operations · 19 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Conformance

Conformance

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

Authentication

TrustCenter

Compliance

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: arch
name: Arch
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/arch/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- menlo-ventures
- uncork-capital
x-tier: profile
x-tier-reason: enriched-from-client-api
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://archlabs.com/images/arch-logo.svg
tags:
- Company
- Private Markets
- Alternative Investments
- Fintech
- Wealth Management
- Investment Administration
- Portfolio-Management
- Documents
tags_raw:
- Company
- Private Markets
- Alternative Investments
- Fintech
- Wealth Management
- Investment Administration
- Portfolio Management
- Documents
apis:
- aid: arch:arch-accounts-api
  name: Arch Accounts API
  description: The Accounts API from Arch — 2 operation(s) for accounts.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/arch-accounts-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-activities-api
  name: Arch Activities API
  description: Interact with Arch objects representing financial updates
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Activities
  properties:
  - type: OpenAPI
    url: openapi/arch-activities-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-addepar-api
  name: Arch Addepar API
  description: The Addepar API from Arch — 1 operation(s) for addepar.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Addepar
  properties:
  - type: OpenAPI
    url: openapi/arch-addepar-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-authentication-api
  name: Arch Authentication API
  description: The Authentication API from Arch — 1 operation(s) for authentication.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/arch-authentication-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-cash-flows-api
  name: Arch Cash Flows API
  description: Read and write data relating to money inflow / outflow
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Cash Flows
  properties:
  - type: OpenAPI
    url: openapi/arch-cash-flows-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-firms-api
  name: Arch Firms API
  description: Reference info about firms.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Firms
  properties:
  - type: OpenAPI
    url: openapi/arch-firms-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-holdings-api
  name: Arch Holdings API
  description: Read holding data and push new investments.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Holdings
  properties:
  - type: OpenAPI
    url: openapi/arch-holdings-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-investing-entities-api
  name: Arch Investing Entities API
  description: Read from and create new investing entities
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Investing Entities
  properties:
  - type: OpenAPI
    url: openapi/arch-investing-entities-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-issuing-entities-api
  name: Arch Issuing Entities API
  description: Read from and create new issuing entities
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Issuing Entities
  properties:
  - type: OpenAPI
    url: openapi/arch-issuing-entities-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-lookthroughs-api
  name: Arch Lookthroughs API
  description: Fetch data relating to the underling investments made by your own investments
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Lookthroughs
  properties:
  - type: OpenAPI
    url: openapi/arch-lookthroughs-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-offerings-api
  name: Arch Offerings API
  description: Get data on individual investment offering opportunities offered by your holdings
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Offerings
  properties:
  - type: OpenAPI
    url: openapi/arch-offerings-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-tasks-api
  name: Arch Tasks API
  description: The Tasks API from Arch — 6 operation(s) for tasks.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Task
  tags_raw:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/arch-tasks-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-tax-documents-api
  name: Arch Tax Documents API
  description: The Tax Documents API from Arch — 4 operation(s) for tax documents.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - Tax Documents
  properties:
  - type: OpenAPI
    url: openapi/arch-tax-documents-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-user-roles-api
  name: Arch User Roles API
  description: The User Roles API from Arch — 1 operation(s) for user roles.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - User Roles
  properties:
  - type: OpenAPI
    url: openapi/arch-user-roles-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
- aid: arch:arch-users-api
  name: Arch Users API
  description: The Users API from Arch — 2 operation(s) for users.
  humanURL: https://arch.co/client-api/api-docs/
  baseURL: https://arch.co/client-api/v0
  tags:
  - User
  tags_raw:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/arch-users-api-openapi.yml
  - type: Documentation
    url: https://arch.co/client-api/api-docs/
  - type: APIReference
    url: https://arch.co/client-api/api-docs/
  - type: Authentication
    url: authentication/arch-authentication.yml
  - type: RateLimits
    url: rate-limits/arch-rate-limits.yml
  - type: ErrorCatalog
    url: errors/arch-problem-types.yml
  - type: Conventions
    url: conventions/arch-conventions.yml
  - type: DataModel
    url: data-model/arch-data-model.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/arch-domain-security.yml
- type: AgenticAccess
  url: agentic-access/arch-agentic-access.yml
- type: Authentication
  url: authentication/arch-authentication.yml
- type: Lifecycle
  url: lifecycle/arch-lifecycle.yml
- type: Conformance
  url: conformance/arch-conformance.yml
- type: X-MCPServerCandidate
  url: mcp/arch-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: LLMsTxt
  url: llms/arch-llms.txt
- type: Overlay
  url: overlays/arch-client-api-overlay.yaml
- type: AgentSkill
  url: skills/_index.yml
- type: TrustCenter
  url: security/arch-trust-center.yml
- type: Website
  url: https://archlabs.com
- type: DeveloperPortal
  url: https://arch.co/client-api/api-docs/
- type: Documentation
  url: https://arch.co/client-api/api-docs/
- type: APIReference
  url: https://arch.co/client-api/api-docs/
- type: GettingStarted
  url: https://arch.co/client-api/api-docs/
- type: Support
  url: https://archlabs.com/contact.html
- type: SignUp
  url: https://archlabs.com/portal
- type: Login
  url: https://archlabs.com/portal/home
- type: TermsOfService
  url: https://arch.co/legal.html
- type: PrivacyPolicy
  url: https://arch.co/legal.html#privacy-policy
- type: Compliance
  url: https://arch.co/legal.html#gdpr-compliance-policy
- type: StatusPage
  url: https://arch-group.gitlab.io/status-page/
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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