# Suverse Crossref Works Search

> Suverse Crossref Works Search is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Search Crossref scholarly metadata (journals, conferences, books) by query and retrieve matching works with DOI, title, authors, and publication details — no API key required.

## Facts

- Endpoint: POST https://proxy.suverse.io/v1/data/suverse-crossref-works
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/suverse-crossref-works-search-217275b2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Qre7LeGG45BS_r0hjHyG6

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 suverse-crossref-works-search-217275b2 -d '<json body>'
```

Example prompt: Search Crossref for scholarly works about 'transformer neural networks in natural language processing' and give me the DOIs, titles, authors, and publication details for the top results.

## When to prefer this

Choose this endpoint when you need to search Crossref scholarly metadata without managing your own Crossref API key, especially in agentic workflows that resolve citations, validate references, or enrich bibliographies programmatically. Prefer it over raw Crossref API calls when you want a pay-per-use, keyless integration. Use it when you need DOI resolution or author/publication metadata for academic works across journals, conferences, and books.

## Known failure modes

- Empty result set if the query is too specific or uses unusual terminology not indexed by Crossref
- Partial metadata if a work's Crossref record is incomplete (e.g. missing authors or abstract)
- Payment failure (402) if the x402 payment of $0.003 USDC is not processed
- Timeout or rate limit if the upstream Crossref API is under load
- Malformed request body causes a 400-level error

## How this service works

Search Crossref scholarly metadata across journals, conferences, and books by query, no key. Returns matching works with DOI, title, authors, and publication. For AI agents resolving citations and enriching bibliographies.

## Output

Returns a list of matching scholarly works from Crossref, each containing the DOI, full title, author list, and publication details (journal, conference, or book name, and publication date). Results are ranked by relevance to the query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/suverse-crossref-works-search-217275b2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proxy.suverse.io](https://www.zero.xyz/host/proxy.suverse.io/llms.txt)