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Delx Citation Extract
x402
Delx Citation Extract is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Extracts URL and DOI citation patterns from caller-supplied text without any network access, returning structured JSON results
Price / call$0.003
Success—
StatusUnknown
How this service works
Harvest URL and DOI citation patterns from text without network access — call when harvesting URL/DOI citation patterns without network. Use on text/URLs the agent already holds—adjacent to high-volume extract demand, never advertised as general web or X search. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web search, or med…
Output
A deterministic machine-readable JSON object listing all extracted URL and DOI citation patterns found in the submitted text, with no network lookups or external validation performed — purely derived from the text supplied by the caller
Example use cases
Academic reference harvesting from pasted paper
“I just pasted in the references section of a research paper — can you extract all the DOIs and URLs from this text without going online? 'References: 1. Jones (2022) doi:10.1016/j.cell.2022.01.001 2. arXiv https://arxiv.org/abs/2201.00001'”
Link audit in scraped web content
“I've got a big block of HTML-stripped article text I already downloaded — can you go through it and pull out every URL citation pattern so I can audit the links? Here's the text: 'For more see https://example.com/study and the dataset at https://data.gov/d/xyz123.'”
DOI inventory from bibliography export
“I exported my bibliography as plain text and need a clean JSON list of every DOI mentioned in it — can you extract them all from this content without fetching anything? Text: 'Müller et al. 2020, doi:10.1007/s00415-020-09912-2; Chen et al. 2019, doi:10.1093/brain/awz320'”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/citation-extractWhen to prefer
Choose this endpoint when you already hold text locally and need to extract URL or DOI citation patterns without any network round-trips — it is purely local, stateless, and deterministic, making it ideal for high-volume or privacy-sensitive extraction tasks where no external fetching or live web access is desired. Prefer it over general-purpose NLP or web-scraping tools when the input is already in-hand and you need fast, consistent, machine-readable citation extraction at low cost.
Side effects
- Empty or whitespace-only text input returns an empty citation list
- Malformed DOIs that don't match standard patterns may not be captured
- Very long text inputs may hit payload size limits
- Ambiguous citation formats (non-standard DOI prefixes) may be missed
- Non-UTF-8 encoded text may cause parsing errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | UTF-8 text to encode, chunk, index, or analyze (caller-supplied only). |
Output
Schema · Response
{
"type": "json",
"example": {
"dois": [
"10.1000/xyz123"
],
"urls": [
"https://example.com/a"
],
"schema": "delx/util-citation-extract/v1",
"advisory": "Pattern harvest only; links are not fetched.",
"doi_count": 1,
"url_count": 1
}
}Tags
x402
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