# SHA3-512 Digest of Hex Bytes Encoded as Base64URL

> SHA3-512 Digest of Hex Bytes Encoded as Base64URL 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 SHA3-512 cryptographic hash of raw hex-encoded bytes and returns the digest encoded as base64url.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-512-base64url-rawhex?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/sha3-512-digest-of-hex-bytes-encoded-as-base64url-9837a2be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OBq9kQlDfp_BwG9fAw02S

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 sha3-512-digest-of-hex-bytes-encoded-as-base64url-9837a2be -d '<json body>'
```

Example prompt: Can you compute the SHA3-512 hash of these raw hex bytes — '4a6f686e446f65' — and give me the result as a base64url string?

## When to prefer this

Use this endpoint when you specifically need a SHA3-512 (not SHA-256 or SHA3-256) digest of raw binary data expressed as hex bytes, and the output must be base64url-encoded. Prefer the free sandbox endpoint POST /v1/sandbox/digest-sha3-512-base64url-rawhex first to validate your integration before spending $0.009 USDC per call on this paid version.

## Known failure modes

- Invalid or non-hex characters in input string cause a 400 error
- Input text or key exceeds maxLength of 100,000 or 512 characters respectively causing a validation error
- Payment of $0.009 USDC not provided or fails causing a 402 Payment Required response
- Empty input (minLength violation) returns a 400 validation error

## How this service works

Call when an agent needs a sha3-512 digest of hex bytes, encoded as base64url. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-512-base64url-rawhex first.

## Output

A SHA3-512 cryptographic digest of the input interpreted as raw hex bytes, returned as a base64url-encoded string. The response is deterministic: the same hex input always produces the same base64url digest.

## 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/sha3-512-digest-of-hex-bytes-encoded-as-base64url-9837a2be/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)