seodata.dev

keyword

quantum theory

Monthly search volume and cost-per-click data for "quantum theory" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=quantum+theory&country=us" +--------------+------------------+ | volume | 8,100 | | cpc | $3.98 | | competition | 0.01 | | country | US | | updated | 2026-06-14 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
what is quantum mechanics 18,100 $6.34 20/20
what is quantum physics 18,100 $2.88 20/20
what are quantum physics 18,100 $4.21 19/20
quantum theory definition 9,900 $2 20/20
define quantum theory 9,900 $8.61 19/20
what is the quantum theory 2,900 $2 20/20
quantum physics explained 1,600 $4.92 20/20
the quantum theory 1,300 $1.52 20/20
what is quantum theory 1,300 $7.83 20/20
quantum mechanics examples 1,300 $10.45 19/20

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=quantum+theory&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt