# 100BTC Evidence Pack - Academic Paper Lookup

> 100BTC Evidence Pack - Academic Paper Lookup is a paid API for AI agents from vps-fc89c157-1.taila28d02.ts.net:10000, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-02).

Retrieves up to 3 Crossref-indexed academic paper records matching a query, including DOI, title, venue, authors, abstract, and publication date

## Facts

- Endpoint: POST https://vps-fc89c157-1.taila28d02.ts.net:10000/api/evidence-pack?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/100btc-evidence-pack-academic-paper-lookup-4a714888
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ap9H_rOB2r7aZuoyJjOTQ

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 100btc-evidence-pack-academic-paper-lookup-4a714888 -d '<json body>'
```

Example prompt: Can you search Crossref for academic papers about 'CRISPR gene editing in plant biology' and give me the titles, authors, abstracts, and DOIs for what comes back?

## When to prefer this

Choose this endpoint when you need quick bibliographic lookups against Crossref's indexed academic literature — especially for DOI retrieval, abstract access, and author/venue data — without needing full-text or synthesis. Prefer this over general web search when you need structured, citable scholarly metadata. Not suitable when you need more than 3 results, full-text PDF access, or AI-synthesized summaries across papers.

## Known failure modes

- Query too short (under 3 characters) returns validation error
- Query too long (over 200 characters) rejected by schema
- No matching papers found in Crossref returns empty results array
- Crossref API unavailability causes upstream error
- Payment not processed (x402) results in HTTP 402 challenge without data
- Ambiguous or very broad queries may return loosely related papers

## How this service works

Thirty x402 v2 pay-per-call APIs by 100BTC. Listing data is generated from each live HTTP 402 challenge and runtime Bazaar schema.

## Output

A JSON object with a 'results' array of up to 3 academic paper records from Crossref, each containing DOI, URL, title, venue (journal), authors list, abstract (when available), publication date, and whether an abstract was available. Also includes status, source attribution ('Crossref'), and scope notes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "maxLength": 200,
   "minLength": 3
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "scope": "up to 3 Crossref-indexed records; abstract when available; no synthesis",
  "source": "Crossref",
  "status": "RESULTS",
  "product": "EXP-15",
  "results": [
   {
    "doi": "10.1002/example.1",
    "url": "https://doi.org/10.1002/example.1",
    "title": "Example paper",
    "venue": "Example Journal",
    "authors": [
     "Example Author"
    ],
    "abstract": "Source abstract.",
    "published": "2024-01-03",
    "abstract_available": true
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/100btc-evidence-pack-academic-paper-lookup-4a714888/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vps-fc89c157-1.taila28d02.ts.net:10000](https://www.zero.xyz/host/vps-fc89c157-1.taila28d02.ts.net%3A10000/llms.txt)