# Numora Matrix Rank API

> Numora Matrix Rank API is a paid API for AI agents from numomo.vercel.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Computes the rank (number of linearly independent rows/columns) of a given matrix

## Facts

- Endpoint: POST https://numomo.vercel.app/api/matrix/rank
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/numora-matrix-rank-api-30e675e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zkAjdo-LZFTZcwY-ASQI_

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 numora-matrix-rank-api-30e675e5 -d '<json body>'
```

Example prompt: What's the rank of this matrix: [[1, 2, 3], [4, 5, 6], [7, 8, 9]]?

## When to prefer this

Choose this endpoint when you need a pure, dependency-free computation of matrix rank with no external library setup, especially within an AI agent workflow that supports x402 micropayments on Base. Ideal when you need a quick, on-demand scalar rank value without spinning up a local numerical computing environment like NumPy or MATLAB.

## Known failure modes

- Non-square or malformed 2D array may return an error
- Missing required 'A' field returns validation error
- Passing a 1D array instead of a 2D array causes failure
- Empty matrix array returns an error
- Non-numeric values in the matrix cause computation failure

## How this service works

100 pure math computation endpoints for AI agents. Statistics, financial math, linear algebra, equation solving, calculus, number theory, sequence generation, and unit conversions. Zero external dependencies. x402 micropayments on Base.

## Output

Returns a JSON object with 'success' (true on success), 'result' (an object containing the computed rank value), and 'computation' (a human-readable string describing what was computed, e.g. 'Rank of a 3x3 matrix').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "A"
 ],
 "properties": {
  "A": {
   "type": "array",
   "description": "Matrix (2D array)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "success",
  "result",
  "computation"
 ],
 "properties": {
  "result": {
   "type": "object",
   "description": "Computation result varies by endpoint"
  },
  "success": {
   "type": "boolean",
   "description": "Always true on success"
  },
  "computation": {
   "type": "string",
   "description": "Human-readable description of what was computed"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/numora-matrix-rank-api-30e675e5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from numomo.vercel.app](https://www.zero.xyz/host/numomo.vercel.app/llms.txt)