Arch website screenshot

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
48.4/100 developing ▬ flat Agent 64/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
15 APIs 1 MCP Servers
CompanyPrivate MarketsAlternative InvestmentsFintechWealth ManagementInvestment AdministrationPortfolio ManagementDocuments

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 48.4/100 · developing
Contract Quality 13.3 / 25
Developer Ergonomics 13.0 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 2.1 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 64/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 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
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/arch: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

arch-mcp.yml

MCP SERVER

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

52 operations · 19 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
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
 MCPServer
MCPServer
 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
DomainSecurity
 Authentication
Authentication
 TrustCenter
TrustCenter
 Compliance
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)

apis.yml Raw ↑ 
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
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
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
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:
  - 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:
  - 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:
  - 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: MCPServer
  url: mcp/arch-mcp.yml
- 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