How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Need help?

Contact us
Arch

Arch Holdings API

Read holding data and push new investments.

Documentation Provider Profile APIs.io OpenAPI GitHub

Arch Holdings API is one of 15 APIs that Arch publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Holdings. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, authentication docs, and rate-limit docs.

This API exposes 12 operations across 10 paths, and defines 24 schemas. It is described by OpenAPI 3.2.0, at version 0.1.0.

Requests are made against a single base URL, /.

12 operations 10 paths 24 schemas 5 GET7 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
0.1.0
Base URL
https://arch.co/client-api/v0
Authentication
HTTP Bearer
Resource Areas
1

Authentication & Security 1

Arch Holdings API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (JWT) (BearerAuth).

Paths & Operations 12

Across 10 paths, the API surfaces 12 operations — 5 GET, 7 POST. Each is listed below with its method, path, parameters, and response codes.

Holdings 12

Read holding data and push new investments.

GET
/client-api/v0/holdings
Get a paginated list of holdings
23 params → 200500
POST
/client-api/v0/holdings
Add a new holding to Arch
body → 201500
GET
/client-api/v0/holdings/{id}
Get data for a specific holding
14 params → 200404500
POST
/client-api/v0/holdings/fund
Add a new funds or real estate holding to Arch
create-funds-holding body → 200400500
POST
/client-api/v0/holdings/company
Add a new company holding to Arch
create-company-holding body → 200400500
POST
/client-api/v0/holdings/account
Add a new account holding to Arch
create-account-holding body → 200400500
GET
/client-api/v0/holdings/{holdingId}/files/types
Get uploadable file types for a holding
get-list-holding-file-types 1 param → 200404
GET
/client-api/v0/holdings/{id}/files
Get all files for a specific holding
3 params → 200404
POST
/client-api/v0/holdings/{id}/files
Upload a new file
post-holding-single-file-upload 1 param body → 200404
POST
/client-api/v0/holdings/{id}/files/statements
Upload a statement file
post-holding-statement-upload 1 param body → 200404
POST
/client-api/v0/holdings/{id}/files/cash-flows
Upload a cash flow notice
post-holding-cashflow-upload 1 param body → 200404
GET
/client-api/v0/holdings/{holdingId}/files/{fileId}/download
Download the file, as originally received.
2 params → 200404

Schemas 24

The contract defines 24 schemas that model the data the API accepts and returns. The most detailed are Holding (32 properties), NewHolding (7 properties), File (7 properties), HoldingList (6 properties). Each schema is shown below with its type and property counts.

HoldingList
object
6 properties 3 required
Timestamp
string
HoldingFileList
object
2 properties
File
object
7 properties 4 required
Holding
object
32 properties 10 required
IssuingEntityRef
object
4 properties 3 required
FinancialValue
object
3 properties
CustomField
object
A user-specified custom field. Does not yet support File fields.
3 properties
CurrencyCode
string
The currency code for the financial value. Defaults to "USD" if not provided.
LinkingMethodEnum
string
Method for linking the investment: - LOA - Arch will link the investment via Letter of Authorization - SubDocs - Client will provide subdocuments for linking -…
InvestingEntityRef
object
4 properties 3 required
AccountRef
object
4 properties 3 required
QSBSTreatmentEnum
string
ShareTypeEnum
string
HoldingRef
object
4 properties 3 required
NewHolding
object
7 properties 2 required
FirmRef
object
4 properties 3 required
TaxDocumentTypeEnum
string
FileTypeList
object
2 properties
TransferInfoInput
object
Records that this new holding is the result of a transfer from an existing holding. The new holding's start date is set to transferDate and a transfer relation…
3 properties 2 required
InvestmentTypeEnum
string
InvestmentLinkStatus
string
OfferingRef
object
4 properties 3 required
NewFinancialValue
object
A financial value in USD. Currently only USD is supported. Most values can be negative, except totalContribution which must be non-negative.
1 property 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

arch-holdings-api-openapi.yml Raw ↑

Other APIs Arch publishes across the network.

Arch Accounts API
AE Profile APIs.io
Arch Activities API
AE Profile APIs.io
Arch Addepar API
AE Profile APIs.io
Arch Authentication API
AE Profile APIs.io
Arch Cash Flows API
AE Profile APIs.io
Arch Firms API
AE Profile APIs.io
Arch Investing Entities API
AE Profile APIs.io
Arch Issuing Entities API
AE Profile APIs.io
Arch Lookthroughs API
AE Profile APIs.io
Arch Offerings API
AE Profile APIs.io
Arch Tasks API
AE Profile APIs.io
Arch Tax Documents API
AE Profile APIs.io
#Holdings
← Back to A APIs
API Details
ID
arch:arch-holdings-api
Base URL
https://arch.co/client-api/v0
Docs
https://arch.co/client-api/api-docs/
Provider
Arch
APIs.io →  GitHub →
Explore more
All APIs Providers APIs.io Network
Work with this as data

Every API here is available over the API and to AI agents over MCP. APIs is not yet its own endpoint on the v1 API. Reach this content through network search and the tag graph, or the MCP server below.

Installs https://mcp.apievangelist.com/mcp in Claude, Cursor, VS Code and the rest — one button, every client.

MCP tools for apis
4 tools reach this content
  • search_api_evangelistSearch every content type across the network at once.
  • find_relatedThe shared-tag relevance graph — what else covers this.
  • get_tagEverything one tag labels, across all content types.
  • guide_topicPRO — a curated bundle for a topic: area, guidance, rules, papers, stories, services.
All tools & prompts
Call it yourself
curl for this page
Search the network for this 
curl "https://api.apievangelist.com/v1/search?q=arch-holdings-api&limit=10"
Everything under a tag 
curl "https://api.apievangelist.com/v1/tags/arch-holdings-api"

Discovery needs no key. Full bodies and the synthesis endpoints are Pro.

Get an API key

Free tier, no email required. Sign in with whichever identity you already have.

GitHub Google LinkedIn

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

Where this information came from

This is an independent, third-party profile of Arch Holdings API, 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.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.