Text Classifier API

Classify text into categories with confidence scores, readability analysis, and content type detection. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "text-classifier": {
      "url": "https://text-classifier.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://text-classifier.api.klymax402.com/api/classify" \
  -H "Content-Type: application/json" \
  -d '{"text":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
text_classify_content	POST	/api/classify	$0.012	Classify text content into categories with confidence scores and readability metrics

text_classify_content

Use this when you need to categorize text into topic categories (tech, finance, health, sports, politics, entertainment, science, business). Returns top 3 categories with confidence scores, detected language, Flesch-Kincaid readability level, and content type (article/review/tutorial/news). Ideal for content organization, tagging, and routing. Do NOT use for sentiment — use text_analyze_sentiment. Do NOT use for summarization — use ai_summarize_text.

Parameters

Name	Type	Required	Description
text	string	yes	The text content to classify (min 50 characters for accurate results)
categories	array	no	Optional custom categories to classify against. Default: tech, finance, health, sports, politics, entertainment, science, business

Example agent prompts

• "Categorize text into topic categories (tech, finance, health, sports, politics, entertainment, science, business)"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT