# Literature Review Map

> Literature Review Map is a paid API for AI agents from api.kadec0.xyz, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-13).

Returns a unified, deduplicated table of references, citations, and semantically related papers for a given seed paper or topic query in a single call.

## Facts

- Endpoint: GET https://api.kadec0.xyz/v1/lit-review
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/literature-review-map-a91b7d4a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7B679W70L4V-eTrY8R2yD

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 literature-review-map-a91b7d4a
```

Example prompt: Can you map out the literature around the paper with DOI 10.1038/s41586-021-03819-2 — give me its references, the papers that cite it, and related work, up to 15 results per section?

## When to prefer this

Choose this endpoint when you need references, citations, and related papers for a seed paper all in one call — avoiding separate lookups for each. It is especially valuable when you want a deduplicated, uniformly formatted table ready for downstream use without stitching together multiple API responses. Prefer it over the sibling 'Citations, References, Cited-By' endpoint when you also need semantically related work included, or over 'Academic Paper Search' when you already have a specific seed paper in mind.

## Known failure modes

- Unrecognized seed ID (invalid DOI, arXiv ID, PMID, or OpenAlex ID) returns an error or empty result
- Topic query returns no matching seed paper
- Rate limiting or payment failure (x402 payment required but not processed) blocks the call
- maxItems out of range (must be 1–25) causes validation error
- Ambiguous topic query returns an unintended seed paper

## How this service works

Literature review map in one call. Give a seed paper (DOI, arXiv id, OpenAlex id, or PMID) or a topic query and get one structured result: the seed's references, its cited-by list (most-cited first), and semantically related work, deduplicated into one uniform table with title, authors, year, venue, DOI, and citation count. Collapses search, citation lookup, and related-paper discovery into a single call. Keyless.

## Output

A single deduplicated table of papers drawn from the seed's reference list, cited-by list (sorted by citation count, most-cited first), and semantically related work. Each row includes title, authors, publication year, venue, DOI, and citation count. Sections are clearly labeled and merged into one uniform response.

## 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": "topic query (seed = top hit); use this OR id/doi"
      },
      "id": {
       "type": "string",
       "description": "seed paper: arXiv id, DOI, OpenAlex id, or PMID"
      },
      "doi": {
       "type": "string",
       "description": "alias for id (DOI form)"
      },
      "maxItems": {
       "type": "string",
       "default": "10",
       "description": "max nodes per section (1-25)"
      }
     }
    }
   },
   "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/literature-review-map-a91b7d4a/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)