# Numora Matrix Trace

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

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

## Facts

- Endpoint: POST https://numormo.vercel.app/api/matrix/trace
- 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-trace-d547d8b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a8hjTh8PM_gEOSQdZWTJx

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-d547d8b8 -d '<json body>'
```

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

## When to prefer this

Use this endpoint when you need a pure, zero-dependency mathematical computation of the matrix trace with no external service calls. Ideal for AI agents that need fast, reliable scalar results from matrix inputs and prefer micropayment-based pay-per-use pricing over subscription APIs. Best when correctness and simplicity matter more than visualization or symbolic output.

## Known failure modes

- Non-square matrix provided — trace is only defined for square matrices
- Malformed 2D array input — jagged arrays or non-numeric values will fail
- Missing required 'A' field in request body
- Empty matrix provided
- Payment failure via x402 micropayment protocol — insufficient USDC balance

## 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 a boolean 'success' field, a 'result' object containing the scalar trace value (sum of main diagonal elements), and a 'computation' string describing what was calculated in human-readable form.

## 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-d547d8b8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from numormo.vercel.app](https://www.zero.xyz/host/numormo.vercel.app/llms.txt)