# Research Funding Evidence Lookup via Knowledge Graph (Crossref)

> Research Funding Evidence Lookup via Knowledge Graph (Crossref) is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Returns Crossref-sourced research funder metadata—DOI references and source attribution—for academic papers related to a query topic, supporting knowledge graph construction around funding evidence.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/signal-research-knowledge-graphs-funding-evidence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/research-funding-evidence-lookup-via-knowledge-graph-crossref-84f690ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nVfYbsUYZcvPIXqcqVKyG

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 research-funding-evidence-lookup-via-knowledge-graph-crossref-84f690ed -d '<json body>'
```

Example prompt: Find me up to 15 research papers about knowledge graph construction and tell me which funders are reported for each — I need the DOIs and their funder attribution from Crossref.

## When to prefer this

Choose this endpoint when you need funder attribution and DOI references for academic papers on a specific topic, particularly when building or enriching a knowledge graph with funding evidence sourced from Crossref. It is especially useful for bibliometric analysis, grant landscape research, or academic data pipelines that need structured funder metadata at low cost per query.

## Known failure modes

- Query returns no results if the topic is too niche or unsupported by Crossref data
- max_results exceeding 30 will be rejected with a validation error
- Missing or incomplete funder metadata in Crossref records may result in sparse output
- Payment failure (x402) if USDC balance is insufficient
- Timeout if Crossref upstream is slow to respond

## How this service works

knowledge graph construction: Reported research funders: Reported research funders on knowledge graph construction using Crossref publisher metadata. Returns DOI references and source attribution. Query can be overridden; sample summaries are labelled.

## Output

A list of academic records related to the query topic, each including DOI references and reported research funder details sourced from Crossref publisher metadata, with sample summaries labelled and source attribution included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "default": "knowledge graph construction",
   "maxLength": 200
  },
  "max_results": {
   "type": "integer",
   "default": 10,
   "maximum": 30,
   "minimum": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/research-funding-evidence-lookup-via-knowledge-graph-crossref-84f690ed/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)