# SHA-512/224 Digest — Base64url Encoded

> SHA-512/224 Digest — Base64url Encoded is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Computes a SHA-512/224 cryptographic hash of the provided text and returns it encoded as a base64url string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-224-base64url?utm_source=zero.xyz
- Price: $0.003/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-digest-base64url-encoded-731d42c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fz606cQY_ZhALhU-9ugwi

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-digest-base64url-encoded-731d42c4 -d '<json body>'
```

Example prompt: Hash the text 'Hello, world!' using SHA-512/224 and give me the result in base64url encoding.

## When to prefer this

Choose this endpoint when you need a SHA-512/224 digest (a truncated SHA-512 variant offering 224-bit security) and require the output in base64url (URL-safe) encoding specifically. Prefer it over SHA-256 or SHA-512 endpoints when your system is constrained to SHA-512/224, and over hex or base64 siblings when the output must be URL-safe without padding. Use the sandbox endpoint /v1/sandbox/digest-sha512-224-base64url first to avoid charges during development.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing required 'key' field returns an authentication or validation error
- Malformed request body returns a 400-level error
- Payment failure (insufficient USDC balance) returns a 402 Payment Required

## How this service works

Call when an agent needs a sha512-224 digest of text, encoded as base64url. No network and no LLM. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-224-base64url first.

## Output

Returns a base64url-encoded SHA-512/224 digest string of the provided input text. The output is a fixed-length, URL-safe hash suitable for use in checksums, cache keys, identifiers, or integrity verification.

## 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-digest-base64url-encoded-731d42c4/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)