x402 Web Tools

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dev.workers.microtools-x402.x402-web-tools/web-toolsv0.2.0 Domain verified

Web/PDF to Markdown, transcription, paper search and citation checks. Pay per call in USDC via x402.

Research & Knowledge Web Search

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https://x402-web-tools.microtools-x402.workers.dev/mcp

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check_citation

Check whether a cited paper really exists (catch hallucinated or mistyped references) and whether it has been retracted. Give a doi, or a title with optional year and first_author. Returns exists, verdict (verified | found | doi_exists_metadata_mismatch | uncertain | not_found), confidence (high/medium/low) with a note on what matched, is_retracted (OpenAlex is_retracted + Crossref/Retraction Watch notices) and the best match. Data: OpenAlex (CC0, openalex.org) with Crossref REST (crossref.org) for retraction notices and as fallback. Upstream errors are not charged. Costs $0.002 USDC per check via x402.

doistring

DOI of the cited work (preferred if known)

yearinteger

Publication year as cited (optional)

titlestring

Title of the cited work (used when no DOI is given; also cross-checked against a DOI)

first_authorstring

First author's name or surname as cited (optional)

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Tools (9)

check_citation

Argument	Type	Description
doi	string	DOI of the cited work (preferred if known)
year	integer	Publication year as cited (optional)
title	string	Title of the cited work (used when no DOI is given; also cross-checked against a DOI)
first_author	string	First author's name or surname as cited (optional)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "doi": {
      "type": "string",
      "maxLength": 300,
      "description": "DOI of the cited work (preferred if known)"
    },
    "year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 1600,
      "description": "Publication year as cited (optional)"
    },
    "title": {
      "type": "string",
      "maxLength": 500,
      "minLength": 8,
      "description": "Title of the cited work (used when no DOI is given; also cross-checked against a DOI)"
    },
    "first_author": {
      "type": "string",
      "maxLength": 100,
      "minLength": 2,
      "description": "First author's name or surname as cited (optional)"
    }
  }
}

get_paper

Look up one scholarly work by DOI (10.xxxx/..., doi.org URL), arXiv id (arXiv:1706.03762) or OpenAlex work id (W...). Returns title, authors, year, venue, DOI, citation count, references count, open-access PDF link, abstract, OpenAlex id and a retraction flag (OpenAlex is_retracted plus Crossref/Retraction Watch notices). Data: OpenAlex (CC0, openalex.org) with Crossref REST (crossref.org) for retraction notices and as fallback. Not-found and upstream errors are not charged. Costs $0.002 USDC per lookup via x402.

Argument	Type	Description
id*	string	DOI, doi.org URL, arXiv:id or OpenAlex work id

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "maxLength": 300,
      "minLength": 3,
      "description": "DOI, doi.org URL, arXiv:id or OpenAlex work id"
    }
  }
}

health

Free health check. Returns service status, version, tool prices, network and the plain-HTTP x402 endpoints.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

ping

Paid connectivity test: returns ok and a server timestamp. Use it to check that your x402 payment flow works end to end. Costs $0.001 USDC per call via x402.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

read_pdf

Fetch a public PDF (max 10 MB) and convert it to Markdown with Cloudflare Workers AI toMarkdown. Returns title (if detected), url, markdown, word_count. Same URL safety rules as read_url. Failed conversions are not charged. Costs $0.006 USDC per call via x402.

Argument	Type	Description
url*	string	Public http(s) URL of a PDF file

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048,
      "description": "Public http(s) URL of a PDF file"
    }
  }
}

read_url

Fetch a public web page and return its main content as clean Markdown (readability extraction): title, url, final_url, markdown, word_count. HTML, plain text, Markdown, JSON and XML. Static fetch only (no JavaScript rendering). Respects robots.txt, blocks private/loopback/metadata hosts, max 3 MB / 15 s, no logins or paywall bypass. For PDFs use read_pdf. Failed reads are not charged. Costs $0.002 USDC per call via x402.

Argument	Type	Description
url*	string	Public http(s) URL to read

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048,
      "description": "Public http(s) URL to read"
    }
  }
}

read_url_safe

Same as read_url plus a heuristic prompt-injection check: flags hidden/invisible text, instruction-like phrases ("ignore previous instructions", role reassignment, secret exfiltration, chat-template tokens), suspicious HTML comments and zero-width/Unicode-tag characters. Returns injection_check {flagged, risk none|low|medium|high, signals}. Heuristic, not a guarantee. Failed reads are not charged. Costs $0.003 USDC per call via x402.

Argument	Type	Description
url*	string	Public http(s) URL to read

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048,
      "description": "Public http(s) URL to read"
    }
  }
}

search_papers

Search scholarly papers (OpenAlex index of 250M+ works). Returns up to 25 results with title, authors, year, venue, DOI, citation count, open-access PDF link, abstract (reconstructed from OpenAlex's inverted index; may be null when the publisher withholds it) and OpenAlex id. Optional from_year / to_year / open_access_only filters. Data: OpenAlex (CC0, openalex.org) with Crossref REST (crossref.org) for retraction notices and as fallback. Upstream errors are not charged. Costs $0.005 USDC per search via x402.

Argument	Type	Description
limit	integer	Number of results, 1-25 (default 10)
query*	string	Search terms (title, abstract and full-text relevance search)
to_year	integer	Latest publication year (inclusive)
from_year	integer	Earliest publication year (inclusive)
open_access_only	boolean	Only open-access works (default false)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "query"
  ],
  "properties": {
    "limit": {
      "type": "integer",
      "maximum": 25,
      "minimum": 1,
      "description": "Number of results, 1-25 (default 10)"
    },
    "query": {
      "type": "string",
      "maxLength": 300,
      "minLength": 2,
      "description": "Search terms (title, abstract and full-text relevance search)"
    },
    "to_year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 1600,
      "description": "Latest publication year (inclusive)"
    },
    "from_year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 1600,
      "description": "Earliest publication year (inclusive)"
    },
    "open_access_only": {
      "type": "boolean",
      "description": "Only open-access works (default false)"
    }
  }
}

transcribe_audio

Transcribe a public direct audio file URL (mp3, wav, m4a, ogg/opus, flac; max 25 MB and 10 minutes, checked from the file header before transcription) with Whisper (@cf/openai/whisper-large-v3-turbo) on Cloudflare Workers AI. Returns text, language, duration, segments with timestamps, optional SRT/VTT subtitles. YouTube/TikTok/Instagram and other page URLs are rejected. Failed transcriptions and files with no detected speech are not charged. Costs $0.01 USDC per file via x402.

Argument	Type	Description
url*	string	Direct public URL of an audio file
language	string	Optional ISO language hint, e.g. en, ur, es (auto-detected if omitted)
subtitles	string	Also return SRT and/or WebVTT subtitles (default none)
include_words	boolean	Include word-level timestamps in segments (default false)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2048,
      "description": "Direct public URL of an audio file"
    },
    "language": {
      "type": "string",
      "maxLength": 5,
      "minLength": 2,
      "description": "Optional ISO language hint, e.g. en, ur, es (auto-detected if omitted)"
    },
    "subtitles": {
      "enum": [
        "none",
        "srt",
        "vtt",
        "both"
      ],
      "type": "string",
      "description": "Also return SRT and/or WebVTT subtitles (default none)"
    },
    "include_words": {
      "type": "boolean",
      "description": "Include word-level timestamps in segments (default false)"
    }
  }
}