# CitePulse Single-Paper Lookup

> CitePulse Single-Paper Lookup is a paid API for AI agents from citepulse.theaslangroupllc.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).

Retrieves citation count, influence score, open-access status with legal OA link, venue, and TLDR for a single paper identified by DOI or title

## Facts

- Endpoint: GET https://citepulse.theaslangroupllc.com/api/paper
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/citepulse-single-paper-lookup-58a33833
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7XDwM4AWrsGmAO3JeyZEi

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 citepulse-single-paper-lookup-58a33833
```

Example prompt: Can you pull up the citation count, open-access link, and a quick summary for the paper '10.1038/s41586-021-03819-2'?

## When to prefer this

Use this endpoint when you need fast, deterministic metadata for a single known paper — especially when you have a DOI or precise title. Ideal for citation checks, verifying whether a paper is freely accessible, or enriching a reference list one paper at a time. Prefer this over the bibliography-batch endpoint for single lookups, and over synthesis endpoints when you want raw factual metadata rather than generated summaries.

## Known failure modes

- DOI not found in OpenAlex or Semantic Scholar — returns 404 or empty result
- Title-based lookup is ambiguous and may return wrong paper — DOI preferred
- Paper is very recent and not yet indexed — citation data may be zero or missing
- Unpaywall has no OA record — open-access URL will be null
- Malformed DOI format causes lookup failure
- Rate limit or upstream provider outage returns 503

## How this service works

Single-paper lookup by DOI or title for research agents — citation count, influence, open-access status with a direct legal-OA link (Unpaywall), venue, and a TLDR. Deterministic passthrough over OpenAlex + Semantic Scholar + Unpaywall, no synthesis, cheap and fast.

## Output

Returns a structured record for the requested paper including: total citation count, influence/prominence score from Semantic Scholar, open-access status (gold/green/closed), a direct legal open-access URL via Unpaywall if available, the publishing venue/journal name, and a machine-generated TLDR abstract summary.

## 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",
     "properties": {
      "doi": {
       "type": "string",
       "description": "DOI of the paper, e.g. 10.1038/nature12373 (preferred — exact match)"
      },
      "title": {
       "type": "string",
       "description": "Paper title (used only if doi is omitted — free-text title search, less certain)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "errors": {
     "type": "object",
     "description": "Documented error responses, keyed by HTTP status code",
     "additionalProperties": {
      "type": "object",
      "required": [
       "description"
      ],
      "properties": {
       "example": {
        "type": "object"
       },
       "description": {
        "type": "string"
       }
      }
     }
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "doi": "10.1038/nature12373",
  "tldr": "Demonstrates nanoscale thermometry using NV centres in diamond to map temperature at the subcellular level.",
  "year": 2013,
  "title": "Nanometre-scale thermometry in a living cell",
  "venue": "Nature",
  "open_access": {
   "is_oa": true,
   "status": "green",
   "best_url": "https://arxiv.org/pdf/1304.1068"
  },
  "is_retracted": false,
  "cited_by_count": 1787
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/citepulse-single-paper-lookup-58a33833/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from citepulse.theaslangroupllc.com](https://www.zero.xyz/host/citepulse.theaslangroupllc.com/llms.txt)