# Numora Matrix Rank

> Numora Matrix Rank is a paid API for AI agents from numorapoi.orbonomy.xyz, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-15).

Computes the rank of a matrix (2D array) via a pure math computation API with x402 micropayments

## Facts

- Endpoint: POST https://numorapoi.orbonomy.xyz/api/matrix/rank
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/numora-matrix-rank-0bd56bee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NHJW07tou2bCShBcb24ry

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-0bd56bee -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

Use this endpoint when an AI agent needs to compute the rank of a matrix without setting up any local computation environment. Ideal for agents operating in stateless or sandboxed environments where running NumPy or MATLAB is not possible. Prefer this over general-purpose code execution when the task is purely matrix rank computation and cost-per-call micropayments are acceptable.

## Known failure modes

- Non-2D array input causes validation error
- Non-numeric values in matrix cause computation failure
- Empty matrix or empty rows trigger error
- Missing required field A returns 400 error
- Oversized matrix may time out or hit compute limits
- Payment failure via x402 returns 402 Payment Required

## 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, a result object containing the computed rank value, and a human-readable computation description string explaining what was calculated.

## 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-0bd56bee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from numorapoi.orbonomy.xyz](https://www.zero.xyz/host/numorapoi.orbonomy.xyz/llms.txt)