# SHA-512 Base64url Digest of UTF-16LE Encoded Text

> SHA-512 Base64url Digest of UTF-16LE Encoded Text is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Computes a SHA-512 cryptographic hash of text encoded as UTF-16LE bytes, returning the digest as a base64url string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-base64url-utf16?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-512-base64url-digest-of-utf-16le-encoded-text-7364da24
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vKwQ2aRMY5PPZoV9RjejQ

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-base64url-digest-of-utf-16le-encoded-text-7364da24 -d '<json body>'
```

Example prompt: Hash the text 'Hello, World!' using SHA-512 with UTF-16LE encoding and give me the result as a base64url string.

## When to prefer this

Choose this endpoint when you specifically need a SHA-512 hash of text that has been encoded as UTF-16LE bytes (as used by Windows, .NET, and Microsoft ecosystems) with the output in base64url format. Prefer this over SHA-256 or SHA-3 variants when interoperating with systems that use UTF-16LE string encoding natively. Use the sandbox variant (/v1/sandbox/digest-sha512-base64url-utf16) for testing to avoid the $0.005 USDC charge.

## 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 a validation error
- Invalid USDC payment or insufficient funds results in 402 Payment Required
- Network timeout if the service is temporarily unavailable

## How this service works

Call when an agent needs a sha512 digest of utf16le bytes, encoded as base64url. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-base64url-utf16 first.

## Output

A base64url-encoded SHA-512 digest string computed from the input text after encoding it as UTF-16LE bytes. The response contains the hash value that can be used for integrity verification, fingerprinting, or comparison with hashes produced by UTF-16LE-aware systems such as .NET or Windows applications.

## 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-base64url-digest-of-utf-16le-encoded-text-7364da24/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)