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Get the collection

The StackOne Platform API collection covers account management, connect sessions, actions, and more — auto-synced daily from the live OpenAPI spec. Run in Postman The collection has Basic Auth pre-configured with {{apiKey}} as the username. Most endpoints also require the x-account-id header, set via {{accountId}}.

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Set up your environment

1

Create an environment

In Postman, click the Environments icon in the left sidebar, then + to create a new environment.
2

Add your credentials

VariableValue
apiKeyYour StackOne API key — find it in the dashboard under Settings → API Keys
accountIdThe linked account ID you want to target — visible in the Accounts page
baseUrlhttps://api.stackone.com — change only if you’re running a self-hosted StackOne region
3

Select the environment

Select your environment from the dropdown in the top-right corner before sending any request.

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Explore the API

The collection is organised into folders by resource:
FolderWhat it covers
AccountsList, retrieve, and manage linked accounts
ActionsExecute and list available actions via RPC
Connect SessionsCreate connect session tokens for linking accounts
ConnectorsList enabled connectors and their metadata
MCPMCP server configuration endpoints
ProxyPassthrough proxy requests
Request LogsRetrieve API request history
Start with GET /accounts to verify your API key, then use the returned account IDs as your accountId variable when exploring other endpoints.

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Also in the public workspace

StackOne Legacy APIs

Unified vertical APIs (HRIS, ATS, CRM, etc.)

StackOne MCP

MCP server endpoints