# Quant Agent Shop – Scholarly Paper Search

> Quant Agent Shop – Scholarly Paper Search is a paid API for AI agents from quantagentshop.com, paid per call via x402, $0.0013/call, status unknown (last checked 2026-10-23).

Searches Crossref for published academic papers by topic, title, or DOI, returning metadata for up to 20 results including authors, year, venue, type, DOI link, and citation count.

## Facts

- Endpoint: POST https://quantagentshop.com/v1/paper-search?utm_source=zero.xyz
- Price: $0.0013/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quant-agent-shop-scholarly-paper-search-2654c94a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C16dRrAnTKA6YYNWefRHl

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 quant-agent-shop-scholarly-paper-search-2654c94a -d '<json body>'
```

Example prompt: Search for up to 10 published papers on transformer attention mechanisms published from 2017 onward and give me their titles, authors, DOIs, and citation counts.

## When to prefer this

Choose this endpoint when you need fast, structured bibliographic metadata for academic papers from Crossref — especially for building citations, discovering literature, or verifying publication details by DOI. Prefer it over full-text retrieval services when you only need metadata (title, authors, year, venue, citation count) and not abstracts or full paper content. It is ideal for agentic literature review workflows where speed and citation accuracy matter.

## Known failure modes

- Invalid DOI format returns an error or empty results
- Query too short (under 3 characters) fails schema validation
- Sending both query and DOI simultaneously is not supported
- No matching papers found returns an empty results array
- Crossref API unavailability causes a failed call (not charged)
- Malformed JSON body returns a 400-level error

## How this service works

Scholarly paper search. Send a topic or title, or one DOI; returns up to 20 published works with title, authors, year, journal or venue, type, DOI link and citation count from Crossref. Use to find and cite papers. Metadata only, no abstracts or full text. Typical response 1 to 2 s. Failed calls are not charged.

## Output

A JSON object containing the original query or DOI, the total number of matching works in Crossref, the data source label, and an array of up to 20 result objects each with: DOI, URL, publication type, year, title, venue (journal or conference), list of author names, author count, and citation count.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {
      "doi": {
       "anyOf": [
        {
         "type": "string",
         "pattern": "^10\\.\\S+/\\S+$",
         "maxLength": 200,
         "minLength": 7
        },
        {
         "type": "null"
        }
       ],
       "title": "Doi",
       "default": null,
       "description": "One DOI, such as 10.1038/nature14539. Send query or doi, not both."
      },
      "rows": {
       "type": "integer",
       "title": "Rows",
       "default": 10,
       "maximum": 20,
       "minimum": 1,
       "description": "How many works to return (query mode)."
      },
      "query": {
       "anyOf": [
        {
         "type": "string",
         "maxLength": 300,
         "minLength": 3
        },
        {
         "type": "null"
        }
       ],
       "title": "Query",
       "default": null,
       "description": "Topic or title to search for."
      },
      "from_year": {
       "anyOf": [
        {
         "type": "integer",
         "maximum": 2100,
         "minimum": 1900
        },
        {
         "type": "null"
        }
       ],
       "title": "From Year",
       "default": null,
       "description": "Only works published from this year on."
      }
     },
     "additionalProperties": false
    },
    "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"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "query": "is attention all you need",
  "total": 1843,
  "source": "Crossref metadata",
  "results": [
   {
    "doi": "10.1007/978-3-031-84300-6_13",
    "url": "https://doi.org/10.1007/978-3-031-84300-6_13",
    "type": "book-chapter",
    "year": 2025,
    "title": "Is Attention All You Need?",
    "venue": "Example Proceedings",
    "authors": [
     "A. Author",
     "B. Author"
    ],
    "cited_by": 55,
    "author_count": 2
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quant-agent-shop-scholarly-paper-search-2654c94a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quantagentshop.com](https://www.zero.xyz/host/quantagentshop.com/llms.txt)