# SHA-512/224 Hex Digest

> SHA-512/224 Hex Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Computes a SHA-512/224 cryptographic hash of input text and returns it as a lowercase hexadecimal string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-224-hex?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-512-224-hex-digest-cd5cb75e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UcWx6UD_Gwyt4DPLWDS0s

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 sha-512-224-hex-digest-cd5cb75e -d '<json body>'
```

Example prompt: Can you give me the SHA-512/224 hex digest of the text 'Hello, world!'?

## When to prefer this

Choose this endpoint when you need a compact SHA-512/224 hash in hexadecimal format specifically — it is faster and produces a shorter digest than full SHA-512 while retaining strong collision resistance. Prefer this over SHA-256 hex when you need the SHA-512/224 standard specifically for compliance or interoperability. Use the free sandbox endpoint POST /v1/sandbox/digest-sha512-224-hex for testing before incurring the $0.001 USDC cost. No external network calls or LLM inference are involved, making this deterministic and fast.

## Known failure modes

- Empty or missing text field returns validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key returns authentication error
- Malformed JSON request body returns 400 error
- Payment failure or insufficient USDC balance returns 402

## How this service works

Call when an agent needs a sha512-224 digest of text, encoded as hex. No network and no LLM. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-224-hex first.

## Output

Returns a lowercase hexadecimal string representing the SHA-512/224 digest of the input text. The output is a deterministic 56-character hex string (224 bits) uniquely identifying the input content.

## 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/sha-512-224-hex-digest-cd5cb75e/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)