# Pixo PDF Password Protect (AES-256)

> Pixo PDF Password Protect (AES-256) is a paid API for AI agents from api.pixo.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Applies AES-256 password protection to a PDF file, billed per page

## Facts

- Endpoint: POST https://api.pixo.tools/v1/pdf/protect
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pixo-pdf-password-protect-aes-256-ec452cce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SaOBfdX1KwM8W6xKX5632

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 pixo-pdf-password-protect-aes-256-ec452cce -d '<json body>'
```

Example prompt: Can you password-protect this PDF with AES-256 encryption? I'll upload the file — set the password to 'Str0ngP@ss2024' so only authorized recipients can open it.

## When to prefer this

Use this endpoint when you need to add AES-256 password protection to a PDF programmatically, especially in automated workflows where document security is required before distribution. Prefer this over client-side solutions when you need a reliable, server-side encryption step integrated into an agent pipeline. It is priced per page, making it cost-effective for smaller documents.

## Known failure modes

- Invalid or corrupted PDF input — returns error indicating file cannot be processed
- File too large or page count exceeds limits — returns quota/size error
- Missing file in request body — returns 400 bad request
- Payment failure or insufficient USDC balance — returns 402 Payment Required
- Unsupported PDF version or encryption conflict — returns processing error

## How this service works

Password-protect a PDF (AES-256) — priced per page

## Output

A password-protected PDF file encrypted with AES-256, returned as a binary payload. The resulting file requires the specified password to open and cannot be read without it.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "file",
  "password"
 ],
 "properties": {
  "file": {
   "type": "string"
  },
  "password": {
   "type": "string",
   "description": "1-256 chars; used as both user and owner password"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "string",
 "format": "binary"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pixo-pdf-password-protect-aes-256-ec452cce/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.pixo.tools](https://www.zero.xyz/host/api.pixo.tools/llms.txt)