# Angle Between Vectors Calculator API

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

Calculate the angle between two 2D or 3D vectors.

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

- Slug: `angle-between-vectors-calculator`
- Category: `math`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/angle-between-vectors-calculator/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/angle-between-vectors-calculator/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `a` | `list` | yes |  |
| `b` | `list` | yes |  |

## Example request

```json
{
  "a": [
    1,
    0,
    0
  ],
  "b": [
    0,
    1,
    0
  ]
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/angle-between-vectors-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"a":[1,0,0],"b":[0,1,0]}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "angle-between-vectors-calculator",
  "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 Angle Between Vectors Calculator API do?

Calculate the angle between two 2D or 3D vectors. 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: a, b. Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

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