Quote engines help SEO indirectly, by improving the metrics Google watches on your site. A visitor who lands on a page and starts a quote stays longer, scrolls deeper, and is far less likely to bounce — all signals that tell search engines “this page actually answered the query.”
They also give you a reason to publish more pages. Each quote engine can be embedded on its own landing page (Auto, Home, Health, Life, etc.) with content matched to that line of business. More relevant pages indexed means more long-tail queries you can rank for.
If you embed your quote engine on an outside site or a partner’s page, set the Powered By link to point back to your own website or profile — that becomes a real inbound link working for you.