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Delx Commerce Citation Extractor
x402
Delx Commerce Citation Extractor is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Extracts DOI identifiers and URLs from arbitrary text using pattern matching, returning structured lists without fetching the links
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing a list of extracted DOIs, a list of extracted URLs, counts for each, the schema version identifier 'delx/util-citation-extract/v1', and an advisory note clarifying that links are not fetched — only their patterns are matched from the input text.
Example use cases
Reference harvesting from research papers
“I've pasted in the body of a research paper — can you extract every DOI and URL mentioned in it so I can build a reference list?”
Audit citations in a blog post
“Here's the text of a blog post I wrote. Find all the URLs I linked to so I can check they're still live.”
Bibliography parsing for literature review
“I have the bibliography section from three papers merged into one block of text. Pull out all the DOI identifiers so I can look them up in my reference manager.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/citation-extract?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, pattern-based extraction of DOIs and URLs from text without any network fetching of those links. It is ideal for preprocessing academic papers, bibliographies, or documents to enumerate references cheaply ($0.003/call) and without signup. Prefer alternatives if you need link validation, full-text retrieval of cited pages, or semantic citation parsing beyond raw pattern matching.
Side effects
- Empty or whitespace-only text input returns zero DOIs and zero URLs with empty arrays
- Malformed DOI patterns that deviate from standard formatting may not be detected
- URLs without standard schemes (http/https) may be missed
- Very large text bodies may hit payload size limits
- 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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