# SHA-224 Base64url Digest

> SHA-224 Base64url 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 SHA-224 cryptographic hash of input text and returns it encoded as base64url, with no network or LLM dependency.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha224-base64url?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/sha-224-base64url-digest-f797ffe7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gn-0RNgnw3YjdVVo6wgDy

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-base64url-digest-f797ffe7 -d '<json body>'
```

Example prompt: Can you give me the SHA-224 hash of the text 'Hello, world!' encoded as base64url?

## When to prefer this

Choose this endpoint when you need a SHA-224 hash specifically encoded as base64url (URL-safe, no padding) rather than hex or standard base64. It is ideal when downstream systems expect base64url-encoded digests — for example, in JWT or URL components. Prefer the free sandbox POST /v1/sandbox/digest-sha224-base64url first for testing; use this paid endpoint for production workloads requiring guaranteed availability.

## Known failure modes

- Missing or empty 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid 'key' field returns an authentication/authorization error
- Payment not completed (HTTP 402) if x402 payment is not resolved
- Non-UTF-8 or malformed input may cause a 400 error

## How this service works

Call when an agent needs a sha224 digest of text, encoded as base64url. No network and no LLM. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/digest-sha224-base64url first.

## Output

Returns the SHA-224 digest of the input text encoded in base64url format (no padding, URL-safe characters). The response is a short deterministic string suitable for use in URLs, headers, or as a compact fingerprint.

## 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-base64url-digest-f797ffe7/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)