# SHA-512 Base64URL Digest of Hex Bytes

> SHA-512 Base64URL Digest of Hex Bytes is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).

Computes a SHA-512 hash of raw bytes supplied as a hex string and returns the digest encoded as base64url

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-base64url-rawhex?utm_source=zero.xyz
- Price: $0.007/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-hex-bytes-9692aa14
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yCmYFH8aPDATdQRz7qTNW

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-hex-bytes-9692aa14 -d '<json body>'
```

Example prompt: Compute the SHA-512 hash of the hex bytes 'deadbeefcafe0123' and give me the result encoded as base64url.

## When to prefer this

Choose this endpoint when you specifically need a SHA-512 hash of binary data supplied as a hex string and want the result in base64url encoding — a combination not commonly offered by generic hash utilities. Prefer the unpaid sandbox endpoint (POST /v1/sandbox/digest-sha512-base64url-rawhex) when available to avoid the $0.007 USDC charge. Use this paid version when the sandbox is unavailable or rate-limited.

## Known failure modes

- Invalid hex string (odd length or non-hex characters) causes a 400 error
- Empty or missing text field returns a validation error
- text field exceeding 100,000 character limit is rejected
- Payment not fulfilled results in 402 response before computation occurs
- Malformed JSON body returns 400

## How this service works

Call when an agent needs a sha512 digest of hex bytes, encoded as base64url. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-base64url-rawhex first.

## Output

A SHA-512 digest of the input hex bytes, returned as a base64url-encoded string (no padding, URL-safe characters). The response is deterministic for identical inputs.

## 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": [
    "68656c6c6f"
   ],
   "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-hex-bytes-9692aa14/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)