seodata.dev

keyword

amendment 21

Monthly search volume and cost-per-click data for "amendment 21" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=amendment+21&country=us" +--------------+------------------+ | volume | 6,600 | | cpc | $0 | | competition | 0.02 | | country | US | | updated | 2026-05-24 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
21st amendment 60,500 $0.27 20/20
what is the 21st amendment 4,400 $0 18/20
amendment xxi 1,600 $0 20/20
21th amendment simplified 1,600 $0 19/20
21st amendment simplified 1,300 $0 19/20
the twenty first amendment 1,300 $0 14/20
the twenty-first amendment 1,300 $0 14/20
what amendment repealed prohibition 880 $0 15/20
21st amendment definition 390 $0 12/20
what is amendment 21 110 $3.66 14/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=amendment+21&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 1,000/month

Full API spec: llms.txt