# SHA-224 Hex Digest

> SHA-224 Hex Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-01).

Computes the SHA-224 cryptographic hash of input text and returns it as a hexadecimal-encoded digest string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha224-hex?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-224-hex-digest-5679b603
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_acOFpbEm92bY0nd5-vKrV

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-224-hex-digest-5679b603 -d '<json body>'
```

Example prompt: Compute the SHA-224 hex digest of the text 'Hello, world! This is my document content.' — I need the result as a lowercase hex string.

## When to prefer this

Choose this endpoint when you need a compact, deterministic SHA-224 hash of text returned as hex (56 hex characters). Prefer the free sandbox endpoint (/v1/sandbox/digest-sha224-hex) for testing. Use this paid endpoint in production when you need reliable uptime. Choose SHA-224 hex over SHA-224 base64 when downstream systems expect hexadecimal encoding. Prefer SHA-256 or SHA-3 endpoints if a longer or different digest algorithm is required.

## Known failure modes

- Empty or missing text field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key returns an authentication error
- Malformed JSON request body causes a 400 bad request
- Payment not provided or insufficient funds returns a 402 Payment Required

## How this service works

Call when an agent needs a sha224 digest of text, encoded as hex. No network and no LLM. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/digest-sha224-hex first.

## Output

Returns a 56-character lowercase hexadecimal string representing the SHA-224 digest of the submitted text. No external network calls or LLM inference are involved — the computation is deterministic and pure.

## 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-224-hex-digest-5679b603/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)