# Delx Seeded Random Bytes Hex

> Delx Seeded Random Bytes Hex is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Generates a deterministic hex string of a specified byte length using a provided seed value, without storing inputs or making external calls.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-random-bytes-hex
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-random-bytes-hex-3ef1caa8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__ETLLafLeUYVZBbCF-55F

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-random-bytes-hex-3ef1caa8 -d '<json body>'
```

Example prompt: Generate 16 bytes of seeded random hex using the seed 'my-agent-session-42' — I need a deterministic hex string I can reproduce later.

## When to prefer this

Choose this endpoint when you need deterministic, reproducible hex output from a known seed — ideal for test fixtures, reproducible nonces, workflow tagging, or any scenario where the same seed must always yield the same output. Prefer this over cryptographic random generators when reproducibility matters more than unpredictability. Avoid when you need cryptographically secure random bytes (the response explicitly flags cryptographic: false).

## Known failure modes

- Missing or empty seed string returns a validation error
- byte_count not provided or non-integer causes a 400-level error
- byte_count exceeding service limits may be rejected
- seed string exceeding 8192 characters is rejected per schema maxLength
- malformed JSON body returns a parse error

## How this service works

Seeded Random Bytes Hex: Seeded Random Bytes Hex returns reproducible non-cryptographic bytes encoded as hex from bounded caller-supplied values without an external provider. Call Seeded Random Bytes Hex 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 Random Bytes Hex as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base…

## Output

Returns a JSON object containing the generated hex string, the byte count used, and a 'cryptographic' boolean (always false, indicating pseudorandom rather than cryptographically secure output). Also includes audit evidence fields: whether inputs were retained (always false), input SHA-256 hash, and external call count (always 0).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Random Bytes Hex; used only for this bounded calculation and processed in memory without retention."
  },
  "byte_count": {
   "type": "integer",
   "description": "Byte Count supplied to Seeded Random Bytes Hex; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "hex": "3453b588df76660a7f2f43b352d4aa07",
   "byte_count": 16,
   "cryptographic": false
  },
  "schema": "delx/util-seeded-random-bytes-hex/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "1e3b9279f92425f828e6fdd3e438f00a5b856edba6d54ba0faef18c330d43845",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_random_bytes_hex"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-random-bytes-hex-3ef1caa8/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)