> ## Documentation Index
> Fetch the complete documentation index at: https://aisa.one/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Keyword Difficulty

> Keyword Difficulty Index (0-100) for one or more keywords.



## OpenAPI

````yaml openapi/semrush.json GET /semrush/keyword-difficulty
openapi: 3.0.3
info:
  title: Semrush API
  version: 1.0.0
  description: >-
    Semrush competitive SEO intelligence routed through the AIsa gateway. Covers
    domain overview, backlinks overview and keyword overview, plus keyword
    research (difficulty, organic/paid results, broad-match, questions), domain
    analytics (rank history, organic/paid keywords, competitors,
    domain-vs-domain), URL keywords and the backlinks suite (backlinks,
    referring domains, anchors, indexed pages, competitors). Proxies the Semrush
    Analytics API; responses are Semrush native semicolon-delimited text with a
    header row. Row-billed endpoints charge per returned data row (header
    excluded), up to 20 rows per call.
servers:
  - url: https://api.aisa.one/apis/v1
security:
  - BearerAuth: []
paths:
  /semrush/keyword-difficulty:
    get:
      summary: Keyword Difficulty
      description: >-
        Keyword Difficulty Index (0-100) for one or more keywords. Billed per
        returned data row at $0.45 per row (up to 20 rows; header row excluded);
        4xx/5xx are not charged. Response is semicolon-delimited text.
      operationId: semrushKeywordDifficulty
      parameters:
        - name: phrase
          in: query
          required: true
          description: One or more keywords separated by `;` (up to 20).
          schema:
            type: string
            example: seo tools;ahrefs
        - name: database
          in: query
          required: false
          description: Regional database / country code. Defaults to `us`.
          schema:
            type: string
            default: us
      responses:
        '200':
          description: >-
            Semicolon-delimited rows. Header: `Keyword;Keyword Difficulty
            Index`.
          content:
            text/plain:
              schema:
                type: string
              example: |-
                Keyword;Keyword Difficulty Index
                seo tools;94
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: AISA API Key

````