# Adjacency Matrix Calculator API

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

Build an adjacency matrix from an edge list (or read one back), with degrees, density, connected components, symmetry, and walk counts from matrix powers.

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

- Slug: `adjacency-matrix-calculator`
- Category: `math`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 262144 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/adjacency-matrix-calculator/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/adjacency-matrix-calculator/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `input_mode` | `str` | no | edges | matrix Choices: edges, matrix |
| `edges` | `str` | no | edge list, e.g. A-B, B-C (undirected) or A->B (directed) |
| `matrix` | `str` | no | 0/1 adjacency matrix, one row per line, for input_mode=matrix |
| `labels` | `str` | no | optional comma-separated vertex labels for matrix input |
| `directed` | `str` | no | no | yes Choices: no, yes |
| `walk_length` | `int` | no | power k for counting walks of length k |

## Example request

```json
{
  "input_mode": "edges",
  "edges": "A-B, B-C, C-A, C-D",
  "directed": "no",
  "walk_length": 2
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/adjacency-matrix-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"input_mode":"edges","edges":"A-B, B-C, C-A, C-D","directed":"no","walk_length":2}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "adjacency-matrix-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 Adjacency Matrix Calculator API do?

Build an adjacency matrix from an edge list (or read one back), with degrees, density, connected components, symmetry, and walk counts from matrix powers. 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: (none). Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

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