Custom Fields API
Custom fields define the workspace schema that subscriber syncs need to understand. This page covers the read-only field catalog available in the public API.
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Read the workspace field schema
Custom fields are the typed schema that subscribers, forms, and segments share. The public API currently exposes them as a read surface so external clients can map ids and labels before writing subscriber values.
Endpoint
List custom fields and cache them in your client if you need to validate or transform incoming external data before upserting subscribers.
GET
/v1/custom-fields List custom fields
Returns custom fields available to the authenticated workspace.
View schema List custom fields
curl "https://api.mailrith.com/v1/custom-fields?limit=50" \
-H "Authorization: Bearer mrk_example_secret_key"Need help shipping an integration?
Reach the Mailrith team if you need help planning a sync, validating a webhook flow, or troubleshooting a request.