Keyword Tool API
Request
Returns related keywords with search volume, based on up to 10 keywords or a URL.
https://seorch.net/api/keyword-tool/?key=YOUR_KEY&keywords=seo%20tool&country=de
Parameters
| Parameters | Required | Meaning |
|---|---|---|
key | yes | Your API key, alternatively in the X-API-Key header |
keywords | no | Up to 10 keywords, required if url is missing |
url | no | Alternatively a URL as starting point |
country | no | Country code, xx (default) means worldwide |
Response
| Field | Meaning |
|---|---|
results | Often several hundred keywords with the same fields as the Search Volume API |
source | The keywords or the URL used |
{
"api_version": 1,
"source": {
"keywords": [
"seo tool"
]
},
"country": "de",
"results": [
{
"keyword": "seo tool",
"search_volume": 368000,
"cpc": 8.71,
"cpc_high": 10.75,
"cpc_low": 0.56,
"competition": 2,
"monthly": {
"2026-09": 823000,
"2026-08": 368000
}
}
],
"skipped": []
}Errors
Errors are returned as JSON with a fixed code. All APIs use missing_key and invalid_key (401), rate_limited (429) and missing or invalid parameters (400). Additionally for this API: missing_keywords, too_many_keywords, url_not_allowed, upstream_error.
Limits
Each key allows 10 requests per minute and 500 per day. Higher limits are available on request.
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