# Document Information Extraction Literature Search

> Document Information Extraction Literature Search is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Searches academic literature on document information extraction topics using Crossref publisher metadata, returning DOI references and source attributions.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/signal-research-document-understanding-literature-search?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/document-information-extraction-literature-search-63d26803
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sCq3vPh6Vc2MiWpQKZ2Ui

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability document-information-extraction-literature-search-63d26803 -d '<json body>'
```

Example prompt: Search for academic literature on document information extraction and give me up to 15 results with their DOIs and source attributions.

## When to prefer this

Choose this endpoint when you need to find peer-reviewed academic literature with DOI references on document information extraction topics, particularly when Crossref coverage is needed for citation tracking or bibliographic work. Prefer this over general web search when verifiable DOI metadata and publisher attribution are required.

## Known failure modes

- No results returned if query is too specific or niche topic not indexed in Crossref
- Query exceeding 200 characters will be rejected
- max_results outside 1–30 range will fail validation
- Crossref metadata may be incomplete for some publications
- Rate limiting or payment failure may prevent call execution

## How this service works

document information extraction: Literature search: Literature search on document information extraction using Crossref publisher metadata. Returns DOI references and source attribution. Query can be overridden; sample summaries are labelled.

## Output

Returns a list of academic publications including DOI references and source attributions, based on Crossref publisher metadata. Results include labeled summaries and are searchable by custom query string, with configurable result count (1–30).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "default": "document information extraction",
   "maxLength": 200
  },
  "max_results": {
   "type": "integer",
   "default": 10,
   "maximum": 30,
   "minimum": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/document-information-extraction-literature-search-63d26803/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)