# Numora Matrix Trace

> Numora Matrix Trace is a paid API for AI agents from numorapoi.orbonomy.xyz, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Computes the trace (sum of diagonal elements) of a given square matrix

## Facts

- Endpoint: POST https://numorapoi.orbonomy.xyz/api/matrix/trace
- Price: $0.04/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-trace-6b2fa900
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-0yLWM-U8MeZnWqaXARqg

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-trace-6b2fa900 -d '<json body>'
```

Example prompt: Can you compute the trace of this matrix for me: [[4, 7, 2], [3, 6, 1], [5, 8, 9]]? I need the sum of its diagonal elements.

## When to prefer this

Use this endpoint when you need a pure, serverless, dependency-free computation of a matrix trace with no external data lookups. Ideal for AI agents that need precise linear algebra results programmatically and want to pay per-use via x402 micropayments on Base rather than maintaining a subscription or running local math libraries.

## Known failure modes

- Non-square matrix provided — trace is undefined for non-square matrices
- Malformed 2D array input — returns error if A is not a proper 2D array
- Empty matrix — may return zero or an error depending on implementation
- Payment failure via x402 — 402 response if micropayment not provided or insufficient
- Network timeout — if the endpoint is slow or unreachable

## 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 trace (scalar sum of diagonal elements), and a human-readable computation string describing 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-trace-6b2fa900/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)