naulon

app.naulon/naulonVersion 1.0.2

Check citations and retractions by DOI, and see the x402 price an AI agent pays to cite a source.

Status

Responds277 msNov 14, 2026, 13:37 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 13:37 UTC
Latency: 277 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://gate.naulon.app/_naulon/mcp/publicResponds277 msNov 14, 2026, 13:37 UTC

No sign-in

Claude Code

claude mcp add --transport http naulon https://gate.naulon.app/_naulon/mcp/public

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: naulon
Remote MCP server URL: https://gate.naulon.app/_naulon/mcp/public

Cursor

{
  "mcpServers": {
    "naulon": {
      "url": "https://gate.naulon.app/_naulon/mcp/public"
    }
  }
}

VS Code

code --add-mcp '{"name":"naulon","type":"http","url":"https://gate.naulon.app/_naulon/mcp/public"}'

Streamable HTTP

npm: @naulon/wayfarer-mcp 0.8.0

Package only

npm (npx)

claude mcp add naulon -- npx -y @naulon/wayfarer-mcp@0.8.0

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Tools

9 tools

Tools of naulon
	Description		Read-only	Idempotent	Open world
`naulon_appraise`Score how relevant each candidate is to the topic from its free teaser alone: a relevance from 0 to 1 and a one-line rationale for each. Call it on the rows naulon_discover returned, to decide which are worth a live price from naulon_quote. Calls are limited per caller: a refused call says how many seconds to wait. It is free: it reads the teaser and the match flags, never the text behind the toll, and it fetches nothing. Pass each row back whole, or a subset of whole rows. `matchedInBody` and `matchedSemantic` tell the scorer why the search returned a row, and without them a source matched in its body scores the same as a near miss.	Score how relevant each candidate is to the topic from its free teaser alone: a relevance from 0 to 1 and a one-line rationale for each. Call it on the rows naulon_discover returned, to decide which are worth a live price from naulon_quote. Calls are limited per caller: a refused call says how many seconds to wait. It is free: it reads the teaser and the match flags, never the text behind the toll, and it fetches nothing. Pass each row back whole, or a subset of whole rows. `matchedInBody` and `matchedSemantic` tell the scorer why the search returned a row, and without them a source matched in its body scores the same as a near miss.	No	Yes	Yes	No
`naulon_check_citations`Check citations before you cite them: for each reference, say whether the work exists and whether it was retracted, withdrawn, corrected or put under an expression of concern. Facts from Crossref and Retraction Watch, with no judgement of the research. For the full record of one paper (authors, licence, abstract, free copy), call naulon_lookup. To find papers on a question, call naulon_retrieve or naulon_search. It is free. Calls are limited per caller: a refused call says how many seconds to wait. A retracted or withdrawn citation comes back with up to three reviews and trials that cite it, and one that was not found with up to three papers on its subject, each with its licence. Send up to 25 references in one call, one per item: an identifier is matched exactly, and a reference written as prose is matched by title, which can come back `unmatched` without meaning the work does not exist.	Check citations before you cite them: for each reference, say whether the work exists and whether it was retracted, withdrawn, corrected or put under an expression of concern. Facts from Crossref and Retraction Watch, with no judgement of the research. For the full record of one paper (authors, licence, abstract, free copy), call naulon_lookup. To find papers on a question, call naulon_retrieve or naulon_search. It is free. Calls are limited per caller: a refused call says how many seconds to wait. A retracted or withdrawn citation comes back with up to three reviews and trials that cite it, and one that was not found with up to three papers on its subject, each with its licence. Send up to 25 references in one call, one per item: an identifier is matched exactly, and a reference written as prose is matched by title, which can come back `unmatched` without meaning the work does not exist.	No	Yes	Yes	Yes
`naulon_check_claim`Hold ONE sentence against the paper it cites. Returns the paper's own paragraphs that share the sentence's terms, best first, up to 5, each linked to its place on the paper's page. It ranks by words and runs no model: it does NOT say whether the paper supports the claim. Read the passages and decide. naulon holds the text of open biomedical and life-science papers; for any other paper `status` says none is held. `searched` says which text was read: `absent` from an abstract is about the abstract only. `wordsNotFound` lists the claim's words found nowhere in that text, so you can ask again in the paper's terms. To check that references exist and are not retracted, call naulon_check_citations. For the paper's record and licence, call naulon_lookup. To find sources on a topic, call naulon_search or naulon_discover. Free, limited per caller: a refused call says how many seconds to wait.	Hold ONE sentence against the paper it cites. Returns the paper's own paragraphs that share the sentence's terms, best first, up to 5, each linked to its place on the paper's page. It ranks by words and runs no model: it does NOT say whether the paper supports the claim. Read the passages and decide. naulon holds the text of open biomedical and life-science papers; for any other paper `status` says none is held. `searched` says which text was read: `absent` from an abstract is about the abstract only. `wordsNotFound` lists the claim's words found nowhere in that text, so you can ask again in the paper's terms. To check that references exist and are not retracted, call naulon_check_citations. For the paper's record and licence, call naulon_lookup. To find sources on a topic, call naulon_search or naulon_discover. Free, limited per caller: a refused call says how many seconds to wait.	No	Yes	Yes	No
`naulon_discover`Browse a TOPIC: list candidate articles, each with its slug, title, free teaser, url and an indicative price where the source lists one, and no verdict on whether it answers a question. It returns no paid text and pays nothing. Call it first, then naulon_appraise to score the candidates and naulon_quote for a live price. For a QUESTION, with a verdict on whether each source answers it, call naulon_search. For one page you already have the address of, call naulon_lookup. Calls are limited per caller: a refused call says how many seconds to wait. The list is the source's best matches in its own order, empty when nothing matched, and never a promise that one answers your question. Each candidate's `match` says why it is there: `title` is the strongest, `body` means your words are in the text behind the toll, `meaning` is the weakest, and no `match` means the source does not search. `topic` is plain words: a subject or a short phrase.	Browse a TOPIC: list candidate articles, each with its slug, title, free teaser, url and an indicative price where the source lists one, and no verdict on whether it answers a question. It returns no paid text and pays nothing. Call it first, then naulon_appraise to score the candidates and naulon_quote for a live price. For a QUESTION, with a verdict on whether each source answers it, call naulon_search. For one page you already have the address of, call naulon_lookup. Calls are limited per caller: a refused call says how many seconds to wait. The list is the source's best matches in its own order, empty when nothing matched, and never a promise that one answers your question. Each candidate's `match` says why it is there: `title` is the strongest, `body` means your words are in the text behind the toll, `meaning` is the weakest, and no `match` means the source does not search. `topic` is plain words: a subject or a short phrase.	No	Yes	Yes	Yes
`naulon_lookup`Get the record of ONE source you already have the address of: a publisher page by its URL, or a paper by its identifier. A page returns its title, site, summary and read and citation prices. A paper returns its title, authors, venue, year, retraction and correction notices, licence, the abstract where it may be shown, and where a free copy is. It searches nothing. To find sources by topic, call naulon_discover or naulon_search. To check many references for retractions at once, call naulon_check_citations. It is free and reads one record. Paper lookups are limited per caller: a refused one says how many seconds to wait. `found: false` is an answer, not a failure: naulon holds nothing under that address, and `reason` says which kind it looked for. A paper identifier or a naulon paper page address is read as a paper; any other https URL as a publisher page.	Get the record of ONE source you already have the address of: a publisher page by its URL, or a paper by its identifier. A page returns its title, site, summary and read and citation prices. A paper returns its title, authors, venue, year, retraction and correction notices, licence, the abstract where it may be shown, and where a free copy is. It searches nothing. To find sources by topic, call naulon_discover or naulon_search. To check many references for retractions at once, call naulon_check_citations. It is free and reads one record. Paper lookups are limited per caller: a refused one says how many seconds to wait. `found: false` is an answer, not a failure: naulon holds nothing under that address, and `reason` says which kind it looked for. A paper identifier or a naulon paper page address is read as a paper; any other https URL as a publisher page.	No	Yes	Yes	No
`naulon_quote`Read the live toll for ONE source without paying it: the author's price, the buyer's total (higher when the publisher adds settlement legs such as an operator fee) and the settlement terms. Call it on a candidate from naulon_discover, whose listed price is only indicative: this one is the publisher's own answer. Calls are limited per caller: a refused call says how many seconds to wait. Prices only: nothing on this server buys, and https://naulon.app/docs/for-buyers explains how buying works. It makes one request to the publisher and is free. `gated: false` means one thing only: the origin answered 2xx, so the page is a free read you may fetch. Anything else is `refused: true` with `refusedReason` and a `note`. A refused url is NEITHER payable nor free: do not fetch it and do not report it as free. Pass `url` whenever discovery gave one, because it is probed exactly as given; `slug` alone is rebuilt as /essays/<slug>, which fits only a site that serves that path.	Read the live toll for ONE source without paying it: the author's price, the buyer's total (higher when the publisher adds settlement legs such as an operator fee) and the settlement terms. Call it on a candidate from naulon_discover, whose listed price is only indicative: this one is the publisher's own answer. Calls are limited per caller: a refused call says how many seconds to wait. Prices only: nothing on this server buys, and https://naulon.app/docs/for-buyers explains how buying works. It makes one request to the publisher and is free. `gated: false` means one thing only: the origin answered 2xx, so the page is a free read you may fetch. Anything else is `refused: true` with `refusedReason` and a `note`. A refused url is NEITHER payable nor free: do not fetch it and do not report it as free. Pass `url` whenever discovery gave one, because it is probed exactly as given; `slug` alone is rebuilt as /essays/<slug>, which fits only a site that serves that path.	No	Yes	Yes	Yes
`naulon_retrieve`Preview RESEARCH PAPERS for a question: list the open CC0, CC BY, CC BY-SA or public-domain papers an answer could quote, and the price of each way to run it. `answer` is an answer written only from quotes proven against the papers; `retrieve` is the proven quotes alone. It is free, it runs neither and it returns no paper text. For publishers' articles on a question, with a verdict on each, call naulon_search. For one paper's record by its DOI or PMID, call naulon_lookup. To check whether references were retracted, call naulon_check_citations. Each call searches the paper corpus. Calls are limited per caller: a refused call says how many seconds to wait. With no quotable paper, `works` still lists what was found and each price in `fees` is null. `mode` changes nothing: both prices are always returned. Prices only: nothing on this server buys. How buying works: https://naulon.app/docs/for-buyers	Preview RESEARCH PAPERS for a question: list the open CC0, CC BY, CC BY-SA or public-domain papers an answer could quote, and the price of each way to run it. `answer` is an answer written only from quotes proven against the papers; `retrieve` is the proven quotes alone. It is free, it runs neither and it returns no paper text. For publishers' articles on a question, with a verdict on each, call naulon_search. For one paper's record by its DOI or PMID, call naulon_lookup. To check whether references were retracted, call naulon_check_citations. Each call searches the paper corpus. Calls are limited per caller: a refused call says how many seconds to wait. With no quotable paper, `works` still lists what was found and each price in `fees` is null. `mode` changes nothing: both prices are always returned. Prices only: nothing on this server buys. How buying works: https://naulon.app/docs/for-buyers	No	Yes	Yes	Yes
`naulon_search`Ask a QUESTION: search every naulon publisher's articles and get each match with its price, public summary, `url`, and a verdict on whether it answers the question and what reading it would add. For a plain list of a topic's articles with no verdict, call naulon_discover. For one source you already have the address of, call naulon_lookup. For research papers alone, with the price of an answer built from them, call naulon_retrieve. It is free and lists at most 5 sources; when nothing matches, `covers` says what the catalogue does hold. Calls are limited per caller: a refused call says how many seconds to wait. Once the day's judged searches are spent a result is matched by words alone, and `unjudged` says so. `papers: true` also lists open research papers on the question and is off unless you set it. Prices only: nothing on this server buys. How buying works: https://naulon.app/docs/for-buyers	Ask a QUESTION: search every naulon publisher's articles and get each match with its price, public summary, `url`, and a verdict on whether it answers the question and what reading it would add. For a plain list of a topic's articles with no verdict, call naulon_discover. For one source you already have the address of, call naulon_lookup. For research papers alone, with the price of an answer built from them, call naulon_retrieve. It is free and lists at most 5 sources; when nothing matches, `covers` says what the catalogue does hold. Calls are limited per caller: a refused call says how many seconds to wait. Once the day's judged searches are spent a result is matched by words alone, and `unjudged` says so. `papers: true` also lists open research papers on the question and is off unless you set it. Prices only: nothing on this server buys. How buying works: https://naulon.app/docs/for-buyers	No	Yes	Yes	Yes
`naulon_trace_passage`Find which naulon publisher pages a passage was copied from, word for word. Returns each page's title and url, whether it holds most of the passage or part of it, and how many Citation Licenses the page has sold where its publisher shows that. Use it on text you were given, to learn where it came from. To find pages by subject, call naulon_search or naulon_discover. It is free. Calls are limited per caller: a refused call says how many seconds to wait. It matches verbatim reuse only, never paraphrase or training, and an empty `matches` with `searched` above zero means no listed page holds these words. Send the passage as it was written, not a summary of it.	Find which naulon publisher pages a passage was copied from, word for word. Returns each page's title and url, whether it holds most of the passage or part of it, and how many Citation Licenses the page has sold where its publisher shows that. Use it on text you were given, to learn where it came from. To find pages by subject, call naulon_search or naulon_discover. It is free. Calls are limited per caller: a refused call says how many seconds to wait. It matches verbatim reuse only, never paraphrase or training, and an empty `matches` with `searched` above zero means no listed page holds these words. Send the passage as it was written, not a summary of it.	No	Yes	Yes	No

Details

Registry status: Active
Published: Nov 13, 2026
Updated: Nov 13, 2026
Website: https://naulon.app/⁠ (opens in a new tab)
Repository: https://github.com/naulonapp/naulon⁠ (opens in a new tab)
Categories: Uncategorized
GDPR: Not declared

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