Official gold price widget
The official branded widget includes its required credit inside the iframe: Powered by goldprice.dev. Personal and commercial websites may use it free without an account or API key, provided the iframe is not modified and the credit remains visible. White-label or modified presentation rights require a separate Enterprise agreement.
API data in commercial products
Every plan permits commercial use. Free requires a visible link to goldprice.dev near the prices. Paid plans need no credit; a link is welcome but optional. The official widget keeps its built-in Powered by goldprice.dev link. Any plan covers any number of websites and apps operated by you or companies that control, are controlled by, or are under common control with you.
Other sources
The sources[] array (add ?include=sources to any /v1/prices request) carries the source identifier, display name, price, fetched_at, and source_timestamp for the feed that produced the price you received. See /methodology for the calculation and validation approach.
Questions on commercial use or attribution placement: email hello@goldprice.dev.