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SEO API · Keyword Research

Keyword Research

Volume, CPC, competition and a 12-month trend for up to 100 keywords in one call.

Send a list of keywords and get back the core metrics most SEO and PPC tools are built on. Ideal for keyword explorers, content planners and bulk research jobs.

POST /api/v1/keywords/global $0.001 / keyword

Use your Seonio API key instantly.

Open Playground

curl

curl -X POST https://seonio.com/api/v1/keywords/global \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $SEONIO_API_KEY" \
  -d '{"keywords": ["keyword research", "seo tools", "domain authority checker"]}'

Sample response

{
  "keywords": [
    {
      "competition": 1,
      "cpc": 37,
      "monthly_trend": [
        {
          "month": "2026-05",
          "value": 450000
        },
        {
          "month": "2026-04",
          "value": 201000
        },
        {
          "month": "2026-03",
          "value": 27100
        }
      ],
      "text": "keyword research",
      "volume": 550000
    },
    {
      "competition": 5,
      "cpc": 86,
      "monthly_trend": [
        {
          "month": "2026-04",
          "value": 301000
        },
        {
          "month": "2026-03",
          "value": 90500
        },
        {
          "month": "2026-02",
          "value": 90500
        }
      ],
      "text": "seo tools",
      "volume": 110000
    },
    {
      "competition": 8,
      "cpc": 41,
      "monthly_trend": [
        {
          "month": "2026-05",
          "value": 110000
        },
        {
          "month": "2026-04",
          "value": 110000
        },
        {
          "month": "2026-03",
          "value": 110000
        }
      ],
      "text": "domain authority checker",
      "volume": 135000
    }
  ]
}

Request and response

The full contract for /api/v1/keywords/global — what to send and what comes back.

Request body

keywords string[] required

1–100 keywords to look up. Billed per keyword.

Response fields

`keywords[].text`	string	The keyword.
`keywords[].volume`	integer	Average monthly search volume.
`keywords[].cpc`	integer	Cost-per-click indicator.
`keywords[].competition`	integer	Competition score (0–10).
`keywords[].monthly_trend`	object[]	Monthly trend points, newest to oldest, each as { month: YYYY-MM, value }.

Code examples

Copy, paste, swap in your API key.

curl -X POST https://seonio.com/api/v1/keywords/global \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"keywords": ["keyword research", "seo tools", "domain authority checker"]}'

import requests

resp = requests.post(
    "https://seonio.com/api/v1/keywords/global",
    headers={"X-API-Key": "YOUR_API_KEY"},
    json={"keywords": ["keyword research", "seo tools", "domain authority checker"]},
)
print(resp.json())

const resp = await fetch("https://seonio.com/api/v1/keywords/global", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-API-Key": "YOUR_API_KEY",
  },
  body: JSON.stringify({"keywords": ["keyword research", "seo tools", "domain authority checker"]}),
});
console.log(await resp.json());

Playground

Run a real /api/v1/keywords/global request. No key? We show the real sample result so you can still inspect the shape.

API key

JSON body

Leave the API key empty to load the built-in sample response.

Request

POST /api/v1/keywords/global

sample mode

What developers build with it

Common ways Keyword Research ends up in production.

Bulk keyword explorers and research dashboards.

Content briefs that need volume and trend at a glance.

Prioritising a backlog by demand and competition.

Status codes

The same predictable contract on every endpoint.

`200`	Success. The lookup completed and was charged, even if the response is empty.
`401`	Missing or unknown API key.
`402`	Not enough balance on the account.
`422`	Invalid request body (wrong shape or types).
`429`	Account rate limit exceeded (20 requests per second).

Other endpoints

Explore the rest of the SEO API.

$0.01 / request

Keyword Countries

/api/v1/keywords/countries

Top five countries by keyword volume.

$0.005 / request

Keyword Difficulty

/api/v1/keywords/difficulty

Country-specific ranking difficulty.

$0.001 / request

Keyword Intent

/api/v1/keywords/intent

Search-intent classification.

$0.01 / request

Keyword Demographics

/api/v1/keywords/demographics

Age and gender demand distribution.

$0.25 / request

Keyword Clustering

/api/v1/keywords/clustering

Group a keyword's universe into topic clusters by SERP overlap.

$0.02 / request

Keyword Suggestions

/api/v1/keywords/suggestions

Up to 100 related keyword ideas — each with full metrics — from one seed keyword.

$0.01 / request + $0.001 / started 10 keywords

Keyword Metrics by Country

/api/v1/keywords/country

Localized metrics for up to 1000 keywords in one country.

$0.001 / request

SERP

/api/v1/serp/country

Google organic results, People Also Ask and related searches for a keyword and country.

$0.001 / request + $0.002 / scraped URL

SERP Scraper

/api/v1/serp/scraper

Run a Google search and get the top results scraped to clean markdown in one call.

$0.002 / request

Scraper

/api/v1/scraper

Scrape a supported URL to clean, LLM-ready markdown in one call.

$0.01 / request

Website Traffic

/api/v1/website/traffic

Monthly organic traffic history for any domain.

$0.02 / request

Website Ranking

/api/v1/website/ranking

A domain's full ranking footprint: countries, distribution, movers, top keywords and pages.

$0.001 / request

Website Category

/api/v1/website/category

Taxonomy classification for a domain.

$0.01 / request

Website Competitors

/api/v1/website/competitors

Ordered organic competitors.

$0.001 / request

Similar Websites

/api/v1/website/similar

Traffic-ranked sites in the same category.

$0.002 / request

URL Stats

/api/v1/url/stats

Page- and domain-level authority metrics for a specific URL.

$0.02 / request

URL Keywords

/api/v1/url/keywords

Top organic keywords for one URL.

$0.002 / request

Website Stats

/api/v1/website/stats

Domain-level authority metrics for a bare domain.

$0.02 / request

Backlink History

/api/v1/backlink/history

Historical backlink counts for a domain.

$0.02 / request

Backlink Table

/api/v1/backlink/table

Detailed backlinks for a domain or URL.

$0.005 / request

SEO Page Checker

/api/v1/audit/page-checker

On-page SEO report and response timing.

FAQ

Simple answers for developers using the API.

Pricing & Balance

Every endpoint has a published USD price or formula. Requests draw from the same included and Extra Usage balance as website and MCP actions.

Testing balance is spent first. Active subscribers then use included usage and Extra Usage expiring soonest. Every amount is displayed in dollars.

New Extra Usage is valid for one year. Included usage is replaced at each subscription-month boundary based on the active tier.

API & Integration

API actions require a verified account with a testing balance or active subscription balance. Create and manage API keys from your account, then send the key in the X-API-Key header.

Yes. Your dashboard shows your API usage and remaining balance, so you can track costs while building and running automated workflows.

We currently cover 50 markets. We add new countries regularly.

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Email support is available for account, billing, and API integration questions at [email protected].

The account-wide limit is 20 requests per second across website, REST API, and MCP data actions. Requests above it return HTTP 429.

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