Supplementary Google APIs for SEO
Knowledge Graph Search API
Verify brand/entity presence in Google's Knowledge Graph.
Endpoint: GET https://kgsearch.googleapis.com/v1/entities:search
| Param | Description |
|---|---|
query |
Search query |
ids |
Specific entity IDs (e.g., /m/0d6lp) |
languages |
Language codes (e.g., en) |
types |
Schema.org types to filter (e.g., Organization, Person) |
limit |
Max results (1-500) |
key |
API key (required) |
Response:
{
"itemListElement": [{
"result": {
"@id": "kg:/m/0d6lp",
"name": "Google",
"@type": ["Organization", "Corporation"],
"description": "Technology company",
"detailedDescription": {
"articleBody": "Google LLC is an American...",
"url": "https://en.wikipedia.org/wiki/Google"
},
"image": { "url": "..." },
"url": "https://www.google.com"
},
"resultScore": 4892.5
}]
}Use for SEO: Verify if a brand has a Knowledge Panel, check entity disambiguation, find related entities.
Quota: 100,000 reads/day. Free. API key only.
Custom Search JSON API
Programmatic Google search results (limited).
Endpoint: GET https://customsearch.googleapis.com/customsearch/v1
| Param | Description |
|---|---|
key |
API key (required) |
cx |
Programmable Search Engine ID (required) |
q |
Search query |
num |
Results per page (1-10) |
start |
Start index (max 91) |
dateRestrict |
Date restriction (e.g., d30 for 30 days) |
gl |
Country (e.g., us) |
lr |
Language restriction |
searchType |
image for image search |
siteSearch |
Restrict to a domain |
Limitations:
- Max 100 total results per query (10 pages x 10 results)
- CLOSED to new customers as of 2025. Existing customers must migrate by January 2027.
- 100 queries/day free, $5 per 1,000 up to 10,000/day
For SERP data, prefer DataForSEO (/seo dataforseo serp) which has no such limitations.
Web Risk API
Check if URLs are flagged as unsafe by Google Safe Browsing.
Endpoint: GET https://webrisk.googleapis.com/v1/uris:search
| Param | Description |
|---|---|
threatTypes |
MALWARE, SOCIAL_ENGINEERING, UNWANTED_SOFTWARE, SOCIAL_ENGINEERING_EXTENDED_COVERAGE |
uri |
URL to check |
key |
API key (required) |
Response (clean URL): Empty threat object.
Response (flagged URL):
{
"threat": {
"threatTypes": ["MALWARE"],
"expireTime": "2026-04-01T00:00:00Z"
}
}Use for SEO: Check if pages are flagged (could explain deindexing), verify competitor safety, audit outbound links.
Quota: 6,000 QPM. 100,000/month free tier. Requires billing enabled on GCP project.