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Best pay-per-call APIs to summarize text for AI agents (September 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Sep 29, 2026 · 8 agents searched Zero for this in the last 90 days

Zero indexes 13 pay-per-call services that summarize text. Of the 10 ranked here, 9 answered a live probe in the last 7 days. Quoted prices run from $0.001 to $0.054 per call, median $0.01, paid per call over x402 with no API key. The three with real agent usage in the last 30 days are AgentReader Summarize, AgentPay Summarize, Quartermaster Webpage Summarizer. The cheapest live option is GPT-5.5 Text Summarization Tool at $0.0029.

  1. agentreader.devAgentReader Summarize4x402

    AI-powered summarization of any web page, raw text, or HTML into a dense, factual summary preserving key numbers, names, and conclusions

    $0.02/message

    Live · checked Oct 1, 20264 calls · 30 days

  2. agentpay.helpAgentPay Summarize — Pay-per-Call Text Summarization via x4023x402

    Summarizes a given text into a concise summary using a pay-per-call model with no API keys, billed at $0.01 USDC per request via the x402 protocol.

    $0.01/message

    Live · checked Oct 1, 20263 calls · 30 days

  3. quartermaster.surewhynot.appQuartermaster Webpage Summarizer1x402

    Fetches any public webpage and returns a factual AI-generated summary at short, medium, or long length.

    $0.01/message

    Live · checked Oct 1, 20261 call · 30 days

  4. gpt55.558686.xyzGPT-5.5 Text Summarization Tool (x402)1x402

    Summarizes a block of text into a specified format (bullets, paragraph, one sentence) using GPT-5.5, paid per-call via x402 USDC on Base.

    $0.00293/message

    Live · checked Oct 2, 20260 calls · 30 days

  5. x402-apis-eta.vercel.appx402 APIs - Text Summarizationx402

    Summarizes a given text into a concise set of sentences using pay-per-request micropayments via the x402 protocol

    $0.01/message

    Live · checked Oct 2, 20260 calls · 30 days

  6. clawtious.creatormagic.aiclawtious.creatormagic.ai AI Text Summarization1x402

    Summarizes a given text into a concise summary using cheap LLM inference on Base via x402 micropayment

    $0.001/message

    Not verified recently0 calls · 30 days

  7. api.strale.ioapi.strale.io Text Summarizerx402

    Summarizes arbitrary text into paragraph, bullet points, or one-sentence format with configurable max word count

    $0.054001/message

    Live · checked Oct 2, 20260 calls · 30 days

  8. api.anchor-x402.comanchor-x402 TL;DR Summarizerx402

    Summarizes a URL or pasted text into 3-5 concise bullet points for $0.01 USDC per call

    $0.01/message

    Live · checked Oct 2, 20260 calls · 30 days

  9. api.x402node.devx402node Text Summarizerx402

    Extracts the most important sentences from a block of text using frequency scoring and returns them in original order with compression statistics

    $0.005/message

    Live · checked Oct 1, 20260 calls · 30 days

  10. main.orbonomy.xyzOrbonomy LLM Summarize1x402

    Summarizes a given text input into a concise summary using an LLM, returning a success indicator and the summarized content.

    $0.05/message

    Live · checked Oct 1, 20260 calls · 30 days

Call one from an agent

zero fetch --capability agentreader-summarize-69750a9b --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.