# clink-lithium-vault.fly.dev

> clink-lithium-vault.fly.dev is a paid API for AI agents from clink-lithium-vault.fly.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-16).

## Facts

- Endpoint: POST https://clink-lithium-vault.fly.dev/pdf/answer
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pdf-answer-6ab7d673
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X9VzBlBJhqrHMqqMoQdzV

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 pdf-answer-6ab7d673 -d '<json body>'
```

## How this service works

Ask a question about any public PDF and get a cited answer - pass a PDF URL and a plain-language question; returns the answer, confidence, verbatim supporting quotes with page numbers, or not_found. PDF question answering, document QA, read a filing/paper/manual/contract for me, extract a fact from a PDF. Text-based PDFs up to 25MB (no OCR). Full text instead: /pdf/text $0.01.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public http(s) URL of a PDF file"
  },
  "question": {
   "type": "string",
   "description": "3-500 char plain-language question about the document"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "answer": "...",
  "citations": [
   {
    "page": 3,
    "quote": "..."
   }
  ],
  "not_found": false,
  "confidence": "high"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pdf-answer-6ab7d673/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clink-lithium-vault.fly.dev](https://www.zero.xyz/host/clink-lithium-vault.fly.dev/llms.txt)