# SHA-512/256 Digest (Base64URL, UTF-16LE) via agentshelf.syntexa.ch

> SHA-512/256 Digest (Base64URL, UTF-16LE) via agentshelf.syntexa.ch 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-512/256 hash of a text string encoded as UTF-16LE bytes, returning the digest as a base64url string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-256-base64url-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-512-256-digest-base64url-utf-16le-via-agentshelf-syntexa-ch-0f98962c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y4SnSdHTN_j40qZMqX0pV

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-512-256-digest-base64url-utf-16le-via-agentshelf-syntexa-ch-0f98962c -d '<json body>'
```

Example prompt: Compute the SHA-512/256 hash of the text 'Hello, World!' treating it as UTF-16LE bytes and give me the result encoded as base64url.

## When to prefer this

Choose this endpoint when you specifically need a SHA-512/256 digest of text bytes interpreted in UTF-16LE encoding (common for Windows-originated strings or COM/NTFS contexts) with base64url output. Prefer the free sandbox endpoint (/v1/sandbox/digest-sha512-256-base64url-utf16) for testing. Use this paid endpoint when the sandbox is unavailable or when operating in production with x402 payment flow.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or empty 'key' field may cause authentication failure
- Payment not provided or insufficient USDC balance returns a 402 error
- Network timeout for very large text inputs near the character limit

## How this service works

Call when an agent needs a sha512-256 digest of utf16le bytes, encoded as base64url. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-256-base64url-utf16 first.

## Output

Returns a base64url-encoded SHA-512/256 digest computed over the UTF-16LE byte representation of the input text string. The output is a compact, URL-safe cryptographic hash suitable for integrity checking, deduplication, or key derivation.

## 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-512-256-digest-base64url-utf-16le-via-agentshelf-syntexa-ch-0f98962c/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)