# SHA3-512 Hex Digest (UTF-16LE Encoding)

> SHA3-512 Hex Digest (UTF-16LE Encoding) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Computes a SHA3-512 hash of text encoded as UTF-16LE bytes and returns the result as a lowercase hex string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-512-hex-utf16?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha3-512-hex-digest-utf-16le-encoding-b0077886
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BFaOs0szONkKsvx6G-KG4

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 sha3-512-hex-digest-utf-16le-encoding-b0077886 -d '<json body>'
```

Example prompt: Can you compute the SHA3-512 hex digest of the text 'Hello, World!' encoded as UTF-16LE bytes?

## When to prefer this

Choose this endpoint when you specifically need SHA3-512 (not SHA2-512 or SHA3-256) applied to text interpreted as UTF-16LE bytes and want the result as a hex string. Prefer the free sandbox endpoint (/v1/sandbox/digest-sha3-512-hex-utf16) first for testing. Use this paid version when the sandbox is unavailable or rate-limited.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing 'key' field may result in authentication or routing failure
- Malformed JSON body returns 400-level error
- Payment not included or insufficient USDC triggers 402 Payment Required

## How this service works

Call when an agent needs a sha3-512 digest of utf16le bytes, encoded as hex. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-512-hex-utf16 first.

## Output

Returns a 128-character lowercase hexadecimal string representing the SHA3-512 digest of the input text after encoding it as UTF-16LE bytes. No network calls or LLM inference are performed; the result is deterministic and repeatable for the same input.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "key": {
   "type": "string",
   "maxLength": 512,
   "minLength": 1,
   "description": "HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored."
  },
  "text": {
   "type": "string",
   "examples": [
    "hello"
   ],
   "maxLength": 100000,
   "minLength": 1,
   "description": "Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sha3-512-hex-digest-utf-16le-encoding-b0077886/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)