# SHA-512/224 Digest (Base64) — agentshelf.syntexa.ch

> SHA-512/224 Digest (Base64) — agentshelf.syntexa.ch is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Computes a SHA-512/224 cryptographic hash of input text and returns the digest encoded as base64, with no network calls or LLM involvement.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-224-base64?utm_source=zero.xyz
- Price: $0.002/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-base64-agentshelf-syntexa-ch-99ff3a2e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7DYFdIIxMxT0h67EBd_Lc

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-base64-agentshelf-syntexa-ch-99ff3a2e -d '<json body>'
```

Example prompt: Can you give me the SHA-512/224 hash of the text 'Hello, world!' encoded as base64?

## When to prefer this

Choose this endpoint when you need a compact, secure cryptographic hash of text using the SHA-512/224 algorithm and want the result base64-encoded — especially when you want to avoid running your own crypto library, need a serverless/stateless hash with no external network calls, or are operating in an agent pipeline that pays per-use via USDC. Prefer the free sandbox endpoint (/v1/sandbox/digest-sha512-224-base64) for testing before using the paid version.

## Known failure modes

- Text or key exceeding maximum length (100,000 or 512 characters respectively) returns a validation error
- Empty text or key field returns a validation error
- Malformed request body returns a 400-level error
- Payment failure or insufficient USDC balance returns a 402 Payment Required error

## How this service works

Call when an agent needs a sha512-224 digest of text, encoded as base64. No network and no LLM. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-224-base64 first.

## Output

Returns a base64-encoded SHA-512/224 digest string computed from the provided input text. The output is a deterministic, fixed-length hash suitable for integrity checks, fingerprinting, or use as a compact identifier.

## 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-base64-agentshelf-syntexa-ch-99ff3a2e/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)