Can I access Facebook Ad Library via API?

Yes — four routes under the Facebook tag. GET /v1/facebook/ad-library/ads/search finds ads by keyword with country, status, media-type, and date filters. GET /v1/facebook/ad-library/ads fetches one ad by archive id or URL, with an optional video transcript. GET /v1/facebook/ad-library/companies/search turns a brand name into a pageId, and GET /v1/facebook/ad-library/companies/ads lists every ad for that page.