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 API contracts indexed 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.

The Arch catalog on APIs.io includes 1 Spectral governance ruleset.

Arch’s developer surface includes authentication, documentation, API reference, getting-started guide, support, signup flow, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

45.6/100 developing ▬ flat Agent 25/100 agent aware saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company Private Markets Alternative Investments Fintech Wealth ManagementInvestment AdministrationPortfolio Management Documents

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 45.6/100 · developing

Contract Quality 8.5 / 19

Developer Ergonomics 8.5 / 15

Access Clarity 7.5 / 15

Operational Transparency 1.5 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 4.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 25/100 · 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 45.3 — up to +13.7 composite points
Operational Transparency scores 15.8 — up to +10.9 composite points
Access Clarity scores 50.0 — up to +10.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/arch/apis.yml: open an issue on github.com/api-evangelist/arch to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Asset and Wealth Management	undeclared	-	-	-
Private Markets and Fund Administration (ILPA, broker-dealer registration, options market-data vendors)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 15

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

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 15

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Add a holding and upload its statement

AGENT SKILL

Authenticate and pull private-market investment data

AGENT SKILL

Triage tasks and retrieve tax documents

AGENT SKILL

Rate Limits 1

Documented rate limits and quota policies.

Arch Rate Limits

0 limits

RATE LIMITS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Arch API Rules

53 rules · 45 errors 7 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Arch Client Api Overlay

3 actions · update · arch-client-api-openapi.json

DERIVED

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 · 18 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 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

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: '2026-11-02'
  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
- Portfolio-Management
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: RateLimits
  url: rate-limits/arch-rate-limits.yml
- 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://arch.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

Arch API — frequently asked questions

Does Arch have an API?

Yes. APIs.io lists 15 APIs from Arch, including Arch Accounts API, Arch Activities API and Arch Addepar API, and 12 more.

Is there an OpenAPI specification for the Arch API?

Yes. APIs.io indexes 15 OpenAPI specifications for Arch, each linked for download from this page.

How do I authenticate with the Arch API?

Arch uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Arch Authentication.

Is the Arch API ready for AI agents?

Arch has a Kin Score of 45.6 out of 100 (developing) and an Agent Readiness score of 24.7 (agent-aware), scored by API Evangelist on 2026-11-02.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/arch"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/arch/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/arch/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

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A second provider on the same verified email joins the account you already have.