# SHA3-512 Base64URL Digest

> SHA3-512 Base64URL Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Computes a SHA3-512 cryptographic hash of input text and returns it encoded as base64url, with no network calls or LLM involvement.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-512-base64url?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha3-512-base64url-digest-d18428a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ND4rrEqKzkmf2XVuB6RGH

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-base64url-digest-d18428a3 -d '<json body>'
```

Example prompt: Hash this text using SHA3-512 and give me the result as base64url: 'Hello, world! This is my document content.'

## When to prefer this

Use this endpoint when you need a SHA3-512 hash specifically encoded as base64url (not hex or plain base64), and want a deterministic, offline-style computation with no external network calls. Prefer the free sandbox endpoint POST /v1/sandbox/digest-sha3-512-base64url during development. Choose this paid version for production workflows where auditability or guaranteed availability matters.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or empty 'key' field causes request failure
- Payment of exactly $0.003 USDC must be provided or request is rejected with 402

## How this service works

Call when an agent needs a sha3-512 digest of text, encoded as base64url. No network and no LLM. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-512-base64url first.

## Output

Returns a SHA3-512 cryptographic digest of the submitted text, encoded as a base64url string. The output is deterministic — identical input always yields the same hash. No network requests are made during computation and no LLM is involved.

## 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/sha3-512-base64url-digest-d18428a3/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)