# fittings Crossref Work Search

> fittings Crossref Work Search is a paid API for AI agents from fittings.sh, paid per call via x402, $0.0078/call, status unknown (last checked 2026-10-10).

Search for academic works by title, author, or keyword to retrieve DOI and bibliographic metadata when the DOI is unknown.

## Facts

- Endpoint: GET https://fittings.sh/v1/crossref/search?utm_source=zero.xyz
- Price: $0.0078/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fittings-crossref-work-search-722a43d7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_utqR49Y_XY6KP0-VAvAAa

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 fittings-crossref-work-search-722a43d7
```

Example prompt: Can you find the DOI and full metadata for a paper about transformer neural networks by Vaswani — I don't have the DOI, just the title fragment 'Attention is All You Need'?

## When to prefer this

Use this endpoint when you have a title fragment, author name, or keyword but do not know the DOI of an academic work and need to resolve it. Prefer this over direct DOI lookup endpoints when the DOI is unknown. Ideal for citation repair, literature discovery, and bibliographic enrichment workflows where the input is fuzzy or partial.

## Known failure modes

- Query too vague returns irrelevant or zero results
- Author name ambiguity returns works by wrong author
- Very new or obscure works may not yet be indexed in Crossref
- Misspelled title fragment may fail to match
- Rate limits or upstream Crossref API unavailability return errors

## How this service works

Find the DOI and metadata for a work from a title, author or keyword string when the DOI is unknown.

## Output

Returns a list of matching academic works from the Crossref database, each including the DOI, title, author list, publication year, journal or conference name, publisher, and other bibliographic metadata. Up to 20 results can be returned, defaulting to 5.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "rows": {
       "type": "number",
       "description": "1-20 results, default 5"
      },
      "query": {
       "type": "string",
       "description": "Title, author or keyword string"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fittings-crossref-work-search-722a43d7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fittings.sh](https://www.zero.xyz/host/fittings.sh/llms.txt)