# SHA3-224 Hex Digest

> SHA3-224 Hex Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-01).

Computes a SHA3-224 cryptographic hash of input text and returns the result encoded as a hexadecimal string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-224-hex?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha3-224-hex-digest-ef36289f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7-afjduJCQDwbqS74n-i9

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-ef36289f -d '<json body>'
```

Example prompt: Can you compute the SHA3-224 hash of the text 'Hello, world!' and give me the result as a hex string?

## When to prefer this

Choose this endpoint when you specifically need a SHA3-224 digest (Keccak-based, 224-bit output) returned in lowercase hexadecimal format. Prefer it over SHA2-224 when SHA-3 family resistance properties are required. Use the free sandbox endpoint (/v1/sandbox/digest-sha3-224-hex) first for testing. Choose a sibling endpoint if you need a different hash algorithm (MD5, RIPEMD-160, SHA-512) or a different output encoding (base32, base64, base64url).

## Known failure modes

- Missing or empty 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Invalid or missing API key results in a 402 Payment Required or authentication failure
- Malformed JSON body returns a 400 error

## How this service works

Call when an agent needs a sha3-224 digest of text, encoded as hex. No network and no LLM. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-224-hex first.

## Output

A hex-encoded SHA3-224 digest string (56 hex characters representing 224 bits) of the submitted text. The response is deterministic — the same input always produces the same digest. No network calls or LLM inference are involved in generation.

## 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-ef36289f/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)