# Paper Full-Text & Open-Access PDF Retrieval

> Paper Full-Text & Open-Access PDF Retrieval is a paid API for AI agents from api.kadec0.xyz, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-13).

Retrieves the full readable body of an academic paper (split into sections) and its open-access PDF location, given an arXiv ID, DOI, OpenAlex ID, PMID, or PMCID.

## Facts

- Endpoint: GET https://api.kadec0.xyz/v1/paper-fulltext
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/paper-full-text-open-access-pdf-retrieval-06fefcd7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AdSkqvO6uWhp9gnT0VPgG

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 paper-full-text-open-access-pdf-retrieval-06fefcd7
```

Example prompt: Can you get me the full text of the paper 2310.06825 — I want to read the methods and results sections, and also find where I can download the open-access PDF?

## When to prefer this

Use this endpoint after identifying a specific paper (e.g., via a paper search) and needing to read or process its full content. Ideal for agents that need to analyze methodology, extract findings, or locate the PDF of an open-access paper by any standard academic identifier. Prefer over general web scraping because it normalizes content across arXiv, biomedical, and general OA repositories automatically.

## Known failure modes

- Paper not open-access — no full text or PDF available, returns empty or partial content
- Invalid or unrecognized ID format — returns 400 or error response
- Paper not indexed by any supported provider (arXiv, Europe PMC, OpenAlex) — no content returned
- Network timeout or upstream provider unavailability — 503 or timeout error
- arXiv ID exists but ar5iv HTML rendering not yet available — partial content returned

## How this service works

Full text and open-access PDF retrieval for a paper. Given an arXiv id, DOI, OpenAlex id, PMID, or PMCID, returns the readable body split into sections (introduction, methods, results) plus the open-access PDF location: arXiv via ar5iv, biomedical via Europe PMC, OA locations via OpenAlex for the rest. The 'now read it' call after a paper search. Keyless.

## Output

Returns the paper's readable body split into named sections (e.g., introduction, methods, results, discussion) and the open-access PDF location sourced from arXiv/ar5iv, Europe PMC, or OpenAlex depending on the paper type.

## 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": [],
     "properties": {
      "id": {
       "type": "string",
       "description": "arXiv id, DOI, OpenAlex id, PMID, or PMCID"
      },
      "doi": {
       "type": "string",
       "description": "alias for id (DOI form)"
      }
     }
    }
   },
   "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/paper-full-text-open-access-pdf-retrieval-06fefcd7/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)