# SHA-512 Hex Digest (UTF-16LE Encoding)

> SHA-512 Hex Digest (UTF-16LE Encoding) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-29).

Computes a SHA-512 hash of text encoded as UTF-16LE bytes and returns the digest as a lowercase hexadecimal string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-hex-utf16?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-512-hex-digest-utf-16le-encoding-dae56021
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V1cSfBdwOiA0vxAjdmie4

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-hex-digest-utf-16le-encoding-dae56021 -d '<json body>'
```

Example prompt: Can you hash the text 'Hello, World!' using SHA-512 with UTF-16LE byte encoding and give me the result as a hex string?

## When to prefer this

Choose this endpoint when you specifically need SHA-512 hashing where the input text must be processed as UTF-16LE bytes (common in Windows environments, .NET, or when interoperating with systems that use wide-character encoding). Prefer the free sandbox endpoint (/v1/sandbox/digest-sha512-hex-utf16) for testing. Use sibling endpoints if you need a different output encoding (base32, base64, base64url) or a different character encoding (plain UTF-8 text vs UTF-16LE bytes).

## Known failure modes

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

## How this service works

Call when an agent needs a sha512 digest of utf16le bytes, encoded as hex. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-hex-utf16 first.

## Output

Returns a hex-encoded SHA-512 digest string computed from the UTF-16LE byte representation of the input text. The output is a 128-character lowercase hexadecimal string uniquely representing the hashed 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-hex-digest-utf-16le-encoding-dae56021/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)