# SHA3-224 Hex Digest (UTF-16LE)

> SHA3-224 Hex Digest (UTF-16LE) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-24).

Computes a SHA3-224 hash of the UTF-16LE byte encoding of a given text string, returning the result as a lowercase hex string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-224-hex-utf16?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha3-224-hex-digest-utf-16le-3655e8f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CBrewWjbT_TkY4_c_RbZn

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 sha3-224-hex-digest-utf-16le-3655e8f0 -d '<json body>'
```

Example prompt: Can you compute the SHA3-224 hex digest of the text 'Hello, World!' using UTF-16LE encoding?

## When to prefer this

Choose this endpoint when you specifically need SHA3-224 (not SHA-256, SHA3-256, or other variants) with UTF-16LE byte encoding — common for compatibility with Windows/.NET systems that default to UTF-16LE. If you don't need the paid version, prefer the unpaid sandbox endpoint POST /v1/sandbox/digest-sha3-224-hex-utf16 first. Use this paid endpoint when the sandbox is unavailable or rate-limited.

## Known failure modes

- Missing or empty 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing 'key' parameter may cause authentication failure
- Payment of $0.005 USDC not included or declined results in HTTP 402
- Malformed JSON request body returns a 400 error

## How this service works

Call when an agent needs a sha3-224 digest of utf16le bytes, encoded as hex. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-224-hex-utf16 first.

## Output

Returns a lowercase hex-encoded SHA3-224 digest (56 hex characters) computed over the UTF-16LE byte representation of the input text. The response includes the hash string corresponding to the submitted text.

## 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/sha3-224-hex-digest-utf-16le-3655e8f0/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)