# Related Paper Discovery via Semantic Scholar / OpenAlex

> Related Paper Discovery via Semantic Scholar / OpenAlex is a paid API for AI agents from api.kadec0.xyz, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-13).

Returns semantically similar and recommended scholarly papers for a given seed paper (arXiv ID, DOI, or OpenAlex ID) or topic query to support literature reviews and reading list expansion.

## Facts

- Endpoint: GET https://api.kadec0.xyz/v1/related-papers
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/related-paper-discovery-via-semantic-scholar-openalex-cec1a258
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lnaNc_kXZo-kPJv8A-XD8

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 related-paper-discovery-via-semantic-scholar-openalex-cec1a258
```

Example prompt: Find me up to 20 papers related to arXiv:2301.07041 so I can expand my literature review on large language model alignment.

## When to prefer this

Use this endpoint when an AI agent needs to expand a reading list, support a systematic literature review, or discover semantically similar papers given a known seed paper (arXiv, DOI, or OpenAlex ID) or a topic query. Prefer over generic web search when structured scholarly metadata and Semantic Scholar recommendations are needed without requiring an API key.

## Known failure modes

- Invalid or unrecognized paper ID returns no results or an error
- Topic query too vague may return low-relevance papers
- Semantic Scholar API unavailable — fallback to OpenAlex related-works triggered
- maxItems out of range (outside 1-50) may return an error
- No related papers found for very niche or brand-new papers

## How this service works

Literature review and related-paper discovery. Given a seed paper (arXiv id, DOI, or OpenAlex id) or a topic query, returns semantically similar and recommended scholarly papers to expand a reading list or systematic review, via Semantic Scholar recommendations with an OpenAlex related-works fallback. Keyless.

## Output

A list of up to 50 semantically related and recommended scholarly papers, sourced from Semantic Scholar with an OpenAlex fallback, each likely including title, authors, abstract snippet, publication venue, year, and identifiers (DOI, arXiv ID, OpenAlex ID).

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "anyOf": [
      {
       "required": [
        "id"
       ]
      },
      {
       "required": [
        "doi"
       ]
      },
      {
       "required": [
        "q"
       ]
      }
     ],
     "required": [],
     "properties": {
      "q": {
       "type": "string",
       "description": "query (alternative to id — relevance search)"
      },
      "id": {
       "type": "string",
       "description": "paper arXiv id, DOI, or OpenAlex id"
      },
      "doi": {
       "type": "string",
       "description": "alias for id (DOI form)"
      },
      "maxItems": {
       "type": "string",
       "default": "15",
       "description": "1-50"
      }
     }
    }
   },
   "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/related-paper-discovery-via-semantic-scholar-openalex-cec1a258/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.kadec0.xyz](https://www.zero.xyz/host/api.kadec0.xyz/llms.txt)