Keyword extraction API: key phrases from text, most relevant first

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

The most important keywords and key phrases of a text, most relevant first. Use for tagging, SEO, search indexing and topic detection.

When to use it

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

Text, up to 12,000 characters

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
text (required)stringText, up to 12,000 characters
countintegerHow many, 3-30 (default 10)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/ai/keywords?text=Cloudflare%20Workers%20run%20JavaScript%20at%20the%20edge.%20Workers%20AI%20adds%20GPU%20inference%20for%20open%20models."

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/ai/keywords?text=Cloudflare%20Workers%20run%20JavaScript%20at%20the%20edge.%20Workers%20AI%20adds%20GPU%20inference%20for%20open%20models.&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "keywords": [
    "Cloudflare Workers",
    "Workers AI",
    "edge computing",
    "GPU inference",
    "open models"
  ],
  "model": "@cf/meta/llama-3.1-8b-instruct-fp8"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ai_keywords, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

What comes back?

A list of keywords and short key phrases, most important first.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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