# Delx Seeded Matrix Cell

> Delx Seeded Matrix Cell is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).

Deterministically selects a matrix cell (row, column) from a seed string and matrix dimensions, returning a reproducible row/column coordinate.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-matrix-cell?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-matrix-cell-e545e181
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7QNxnO9M410z0uOabWQBt

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 delx-seeded-matrix-cell-e545e181 -d '<json body>'
```

Example prompt: Use the seeded matrix cell endpoint with the seed 'user-abc-123' and a 5-row by 10-column matrix to deterministically pick a cell for this user.

## When to prefer this

Choose this endpoint when you need a fast, deterministic, in-memory mapping from an arbitrary string seed to a bounded 2D grid coordinate — ideal for reproducible sharding, slot assignment, or experiment bucketing without storing state. Prefer it over custom hashing code when you want an auditable, governance-friendly result with an evidence block confirming no data retention.

## Known failure modes

- Missing or empty seed returns a validation error
- Non-integer rows or columns causes a schema rejection
- Seed exceeding 8192 characters is rejected
- Zero or negative dimension values may produce an error or undefined behavior
- Network timeout on the POST request

## How this service works

Seeded Matrix Cell: Seeded Matrix Cell selects one reproducible row and column inside matrix bounds from bounded caller-supplied values without an external provider. Call Seeded Matrix Cell when an agent needs a reproducible decision that another run can independently replay. Returns the deterministic selection plus seed provenance, population bounds, and the operation-specific outcome for Seeded Matrix Cell as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stat…

## Output

Returns a JSON object containing the selected row and column indices derived from the seed, along with the operation name, status, and an evidence block confirming no external calls were made and no input was retained, including a SHA-256 hash of the input for auditability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rows": {
   "type": "integer",
   "description": "Rows supplied to Seeded Matrix Cell; used only for this bounded calculation and processed in memory without retention."
  },
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Matrix Cell; used only for this bounded calculation and processed in memory without retention."
  },
  "columns": {
   "type": "integer",
   "description": "Columns supplied to Seeded Matrix Cell; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "row": 3,
   "column": 3
  },
  "schema": "delx/util-seeded-matrix-cell/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "e8e85927a02e5f114b46f474a41aacbab9685306c2b1437ffb5f66d3672041c5",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_matrix_cell"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-matrix-cell-e545e181/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)