Fan-out
Sending one query to several sources at once and collecting the answers.
What it means
Fan-out turns one question into many parallel calls, one per source. The hard part is combining answers that come back in different orders and quality.
How Onekey handles it
GET /v1/search/multi sends one query to several platforms and GET /v1/creator/card sends one handle. Rows come back side by side, each in its platform’s own order, with per-row status and cost. Ask for fuse=rrf to also get one merged list.