# SHA3-256 Digest with Base64url Encoding (Raw Hex Input)

> SHA3-256 Digest with Base64url Encoding (Raw Hex Input) 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 SHA3-256 cryptographic hash of hex-encoded bytes and returns the digest encoded as base64url.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-256-base64url-rawhex?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/sha3-256-digest-with-base64url-encoding-raw-hex-input-461556db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_p1-bzKysBo4AVVF_vlFKC

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 sha3-256-digest-with-base64url-encoding-raw-hex-input-461556db -d '<json body>'
```

Example prompt: Can you compute the SHA3-256 hash of the hex bytes 'deadbeef0123456789abcdef' and give me the result encoded as base64url?

## When to prefer this

Choose this endpoint when you specifically need a SHA3-256 hash (not SHA2/MD5/BLAKE) of raw hex-encoded bytes returned in base64url format. It is distinct from endpoints handling plain text or binary input and those returning hex or base64 (non-url) output. Use the free sandbox endpoint POST /v1/sandbox/digest-sha3-256-base64url-rawhex first for testing before paying $0.005 USDC per call.

## Known failure modes

- Invalid hex string input (non-hex characters) may result in an error or rejected request
- Input exceeding maxLength of 100,000 characters will be rejected
- Payment failure or insufficient USDC balance returns HTTP 402
- Malformed request body returns 400 Bad Request

## How this service works

Call when an agent needs a sha3-256 digest of hex bytes, encoded as base64url. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-256-base64url-rawhex first.

## Output

Returns a SHA3-256 cryptographic digest of the input hex bytes, encoded as a base64url string. The output is a compact, URL-safe representation of the hash suitable for use in identifiers, integrity checks, or further cryptographic operations.

## 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/sha3-256-digest-with-base64url-encoding-raw-hex-input-461556db/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)