AI Text Summarizer API

AI text and URL summarizer -- key points, word count reduction, reading time. Fast extractive summaries for agents. 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.):

config.json

{
  "mcpServers": {
    "ai-summarizer": {
      "url": "https://ai-summarizer.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

Terminal

curl -X POST "https://ai-summarizer.api.klymax402.com/api/summarize" \
  -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
`ai_summarize_text`	POST	`/api/summarize`	$0.03	Summarize raw text into key points
`ai_summarize_url`	GET	`/api/summarize`	$0.04	Fetch a URL and summarize its content

`ai_summarize_text`

Use this when you need to summarize long text into concise key points. Returns a structured summary with bullet points and reading metrics.

Parameters

Name	Type	Required	Description
`text`	string	yes	The text to summarize
`maxLength`	number	no	Maximum summary length in words (default 200)

Returns

summary -- condensed text summary (respects maxLength)
keyPoints -- array of 3-7 extracted key takeaways
wordCountOriginal -- word count of input text
wordCountSummary -- word count of output summary
reductionPercent -- percentage of text reduced (e.g. 78%)
readingTimeMinutes -- estimated reading time for the summary

Example response:

config.json

{"summary":"The article discusses...","keyPoints":["AI adoption grew 40%","Enterprise spending up"],"wordCountOriginal":2500,"wordCountSummary":180,"reductionPercent":92,"readingTimeMinutes":1}

When to use: presenting lengthy content to users. Essential for digesting articles, reports, meeting notes, or documentation into actionable summaries.

`ai_summarize_url`

Use this when you need to summarize a web page by URL. Fetches the page, extracts text, and returns a structured summary with key points and reading metrics.

Parameters

Name	Type	Required	Description
`url`	string	yes	URL of the web page to summarize
`maxLength`	number	no	Maximum summary length in words (default 200)

Returns

summary -- condensed text summary of the page content
keyPoints -- array of 3-7 key takeaways from the page
wordCountOriginal -- word count of the full page text
wordCountSummary -- word count of the summary
reductionPercent -- percentage of content reduced
readingTimeMinutes -- estimated reading time for the summary
title -- page title extracted from HTML

Example response:

config.json

{"title":"OpenAI Blog","summary":"The post announces...","keyPoints":["GPT-5 launches Q3","API pricing drops 50%"],"wordCountOriginal":4200,"wordCountSummary":200,"reductionPercent":95,"readingTimeMinutes":1}

When to use: citing or referencing web articles. Essential for quickly understanding web pages without reading the full content.

Example agent prompts

"Summarize long text into concise key points"
"Summarize a web page by URL"

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)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

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