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SEO API

Keyword Difficulty

Country-specific ranking difficulty.

Start free Try it
POST /api/v1/keywords/difficulty$0.005 / requestAuth: X-API-Key header
seonio / rest apiFrom the API docs
RequestPOST /api/v1/keywords/difficulty
curl -X POST https://seonio.com/api/v1/keywords/difficulty \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $SEONIO_API_KEY" \
  -d '{"country": "us", "keyword": "seo tools"}'
Response200 OK
{
  "text": "seo tools",
  "country": "us",
  "difficulty": 42
}
Contract

What to send and what comes back

Estimate organic ranking difficulty for one keyword and country.

Request body

Request body
FieldTypeRequiredDescription
keyword string required Keyword to inspect.
country string optional Two-letter ISO country code (default "us").
50 supported countries
dzAlgeriaarArgentinaauAustraliaatAustriabdBangladeshbeBelgiumbrBrazilbgBulgariacaCanadaczCzechiadkDenmarkegEgyptfiFinlandfrFrancedeGermanyghGhanagrGreecehuHungaryinIndiaidIndonesiaieIrelanditItalyjpJapankeKenyamyMalaysiamxMexicomaMorocconlNetherlandsnzNew ZealandngNigerianoNorwaypkPakistanphPhilippinesplPolandptPortugalroRomaniasaSaudi ArabiarsSerbiasgSingaporezaSouth AfricaesSpainlkSri LankaseSwedenchSwitzerlandthThailandtrTurkiyeaeUnited Arab EmiratesgbUnited Kingdom (also uk, returned as gb)usUnited StatesvnVietnam

Response

Response fields
FieldTypeDescription
difficulty integer Difficulty score.
Code

Copy, paste, add your key

The same request in cURL, Python and Node.js.

cURL
curl -X POST https://seonio.com/api/v1/keywords/difficulty \
  -H "Content-Type: application/json" \
  -H "X-API-Key: YOUR_API_KEY" \
  -d '{"country": "us", "keyword": "seo tools"}'
Python
import requests

resp = requests.post(
    "https://seonio.com/api/v1/keywords/difficulty",
    headers={"X-API-Key": "YOUR_API_KEY"},
    json={"country": "us", "keyword": "seo tools"},
)
print(resp.json())
Node.js
const resp = await fetch("https://seonio.com/api/v1/keywords/difficulty", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "X-API-Key": "YOUR_API_KEY",
  },
  body: JSON.stringify({"country": "us", "keyword": "seo tools"}),
});
console.log(await resp.json());
Playground

Run a real request

Send this request from your browser with your API key, or leave the key empty to see the sample response.

A successful run costs $0.005 / request. With no key, you see the sample response and nothing is charged.

POST /api/v1/keywords/difficultySample response
{
  "country": "us",
  "difficulty": 42,
  "text": "seo tools"
}
Use cases

What developers build with it

  • Keyword prioritization.
Status codes

The same contract on every endpoint

Error responses are JSON with a "detail" field. It is a message string unless the row above says otherwise.

Status codes
CodeWhen
200Success. The lookup completed and was charged, even if the response is empty. /keywords/global charges only the keywords it looked up.
401Missing or unknown API key.
402Not enough balance. "detail" is an object with "error", "message", "balance_required" and "balance_available". Requests still running hold their price until they finish, so a retry can succeed once they do.
403The account is not verified yet, or it is locked.
422Invalid request (wrong shape or types, a keyword over 200 characters, a URL the page checker cannot audit, a domain that does not exist, or a bare public suffix such as co.uk that groups many websites) — never charged. "detail" is usually a list of validation errors; an answer that retrying cannot change (such as a domain without a DNS record) is a message string with an X-Outcome header naming it: missing, unsupported, too_large or refused_input.
429Rate limit exceeded, never charged. Requests per second per account by plan: 5 on a free account, 10 on Starter, 15 on Pro and 20 on Business; retry after the Retry-After header. Also the page checker's provider limit.
503A data provider failed or timed out (X-Outcome: temporary). Nothing was charged; retry after the seconds in the Retry-After header.
FAQ

Questions, answered

Simple answers for developers using the API.

Every endpoint has a published USD price or formula. Requests draw from the same testing, included and Extra Usage balance as website and MCP actions: testing first, then included usage, then Extra Usage expiring soonest.

API actions require a verified account with a free $1 balance or an active subscription balance. Create and manage API keys from your account, then send the key in the X-API-Key header.

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

REST API and MCP requests per second depend on your plan: 5 on a free account, 10 on Starter, 15 on Pro and 20 on Business. Website data requests from the same account count toward the same second. Requests above the limit return HTTP 429 with a Retry-After header and are not charged; wait a second and retry.

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