Hightouch · Authentication Profile

Hightouch Authentication

Authentication

Hightouch secures its APIs with http, oauth2, and openIdConnect across 3 declared security schemes, as derived from its OpenAPI definitions. OAuth 2.0 is offered via the authorizationCode flow(s).

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Methods: http, oauth2, openIdConnect Schemes: 3 OAuth flows: authorizationCode API key in: header

Security Schemes

bearerAuth http

scheme: bearer

oauth2 oauth2

· flows: authorizationCode

openIdConnect openIdConnect

Source

Authentication Profile

generated: '2026-08-13'
method: searched
source: openapi/_original/hightouch-api-openapi.json, https://hightouch.com/docs/developer-tools/api-guide,
  https://api.hightouch.com/.well-known/oauth-protected-resource, a2a/hightouch-agent-card.json
docs: https://hightouch.com/docs/developer-tools/api-guide
summary:
  types:
  - http
  - oauth2
  - openIdConnect
  api_key_in:
  - header
  oauth2_flows:
  - authorizationCode
  surfaces:
    rest_management_api: bearer workspace API key
    a2a_agent: oauth2 authorizationCode (mcp-auth.hightouch.com)
    workspace_mcp: oauth2 (same authorization server)
    docs_mcp: none (anonymous)
    events_ingest: write key (per-source), see https://hightouch.com/docs/events/overview
schemes:
- name: bearerAuth
  type: http
  scheme: bearer
  bearerFormat: Bearer
  sources:
  - openapi/_original/hightouch-api-openapi.json
  applies_to: https://api.hightouch.com/api/v1 (all 43 operations)
  credential: Workspace API key created by an Admin user under Settings > API keys
  env_var: HIGHTOUCH_APIKEY (used by the ht CLI)
  notes:
  - Keys authenticate AS THEIR CREATING USER. If that user is deactivated, loses workspace access, or
    is removed during an SSO migration, every key they created stops working — the provider documents
    this as the most common cause of 401s.
  - Admin role is required to create an API key.
  - TLS 1.2 or later is required; the API publishes its accepted cipher suite list.
  - Keys are revocable individually from the Settings > API keys tab.
- name: oauth2
  type: oauth2
  sources:
  - a2a/hightouch-agent-card.json
  - https://api.hightouch.com/.well-known/oauth-authorization-server
  flows:
  - flow: authorizationCode
    authorizationUrl: https://mcp-auth.hightouch.com/oauth2/authorize
    tokenUrl: https://mcp-auth.hightouch.com/oauth2/token
  applies_to: https://api.hightouch.com/api/v1/a2a/messages and the workspace MCP server
  scopes:
  - openid
  - profile
  - email
  - offline_access
  notes:
  - 'Protected-resource metadata is advertised per RFC 9728; an unauthenticated POST to the A2A endpoint
    returns 401 with WWW-Authenticate: Bearer resource_metadata="https://api.hightouch.com/.well-known/oauth-protected-resource".'
  - Dynamic client registration is open at /oauth2/register.
  - token_endpoint_auth_methods_supported includes `none`, i.e. public PKCE clients are allowed.
- name: openIdConnect
  type: openIdConnect
  openIdConnectUrl: https://api.hightouch.com/.well-known/openid-configuration
  sources:
  - well-known/hightouch-openid-configuration.json
  notes:
  - Same issuer as the OAuth AS (mcp-auth.hightouch.com); RS256 ID tokens; userinfo endpoint.
workspace_access_control:
  sso: SAML 2.0 / Okta / Azure AD / Google — https://hightouch.com/docs/workspace-management/sso
  rbac: https://hightouch.com/docs/workspace-management/roles
  approval_flows: https://hightouch.com/docs/workspace-management/approval-flows
  audit_logs: https://hightouch.com/docs/workspace-management/overview

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