# Caesar Cipher Tool API

> For the complete documentation index, see [llms.txt](/llms.txt).

Encrypt or decrypt text with a Caesar shift cipher, with optional brute-force candidates.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `caesar-cipher-tool`
- Category: `text`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `no_body_logs`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/caesar-cipher-tool/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/caesar-cipher-tool/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `text` | `str` | yes |  |
| `shift` | `int` | no |  |
| `mode` | `str` | no | encrypt | decrypt Choices: encrypt, decrypt |
| `include_brute_force` | `bool` | no |  |

## Example request

```json
{
  "text": "Hello World",
  "shift": 3,
  "mode": "encrypt"
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/caesar-cipher-tool/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"text":"Hello World","shift":3,"mode":"encrypt"}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "caesar-cipher-tool",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the Caesar Cipher Tool API do?

Encrypt or decrypt text with a Caesar shift cipher, with optional brute-force candidates. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: text. Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.