See the search filtering documentation for details about the query syntax. The searchable attributes and the operators each one accepts are listed in the request body below.

• Sources and destinations (source_contact, destination_contact, source_company, destination_company) take a reference with equal or not_equal:
  { "source_contact": { "equal": "/v1/contacts/1000" } }
  Use null to match relationships without one, e.g. { "source_contact": { "equal": null } } finds relationships between companies.
• relationship_type takes a relationship type search filter:
  { "relationship_type": { "any": { "forward": { "equal": "is the parent company of" } } } }
  Use blank or not_blank to find relationships without or with a type.