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

Get API Key

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`	Rate limit exceeded (fixed-window default: 30 requests / 3 seconds).

Other endpoints

Explore the rest of the SEO API.

Keyword Clustering

/api/v1/keywords/clustering

Keyword Suggestions

/api/v1/keywords/suggestions

Keyword Metrics by Country

/api/v1/keywords/country

SERP

/api/v1/serp/country

SERP Scraper

/api/v1/serp/scraper

Scraper

/api/v1/scraper

Website Traffic

/api/v1/website/traffic

Website Ranking

/api/v1/website/ranking

URL Stats

/api/v1/url/stats

Website Stats

/api/v1/website/stats

Website Backlinks

/api/v1/backlink/website

URL Backlinks

/api/v1/backlink/url

API Balance

Add funds once and use them anytime. Your balance never expires. New accounts start with $1 free.

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$ 10 one-time

Balance never expires.

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Get Started

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$ 100 one-time

+15% bonus
$100 + $15 free

The sweet spot for steady production traffic.

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Scale

$1,300 to spend

$ 1,000 one-time

+30% bonus
$1,000 + $300 free

Best rate per dollar for high-volume workloads.

Get Started

FAQ

Simple answers for developers using the API.

Pricing & Balance

Every API endpoint has a fixed price in USD. Your requests are charged directly against your API balance, so you always know what each call costs.

No. Seonio does not use abstract credits for API pricing. You add dollars to your account and spend that balance directly on API usage.

No. Your API balance never expires, so you can use it whenever your workflows need it.

Paid API requests stop until you add more balance. This keeps spend predictable and prevents unexpected charges.

API & Integration

You can create and manage API keys from your account. Use your key to authenticate requests from your app, scripts, or internal tools.

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

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Our support team responds to email inquiries within 1 business day. We can help with account, billing, and API integration questions.

We enforce a global rate limit per API-Key of 10 requests per second across all endpoints to ensure system stability. If you exceed this, our servers will return an HTTP 429 Too Many Requests status code. To handle this seamlessly in production, we recommend building rate-limiting logic or an exponential backoff (briefly pausing before retrying) directly into your application code.

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