# SHA3-256 Digest of Hex Bytes Encoded as Base64

> SHA3-256 Digest of Hex Bytes Encoded as Base64 is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Computes a SHA3-256 cryptographic hash of hex-encoded input bytes and returns the digest encoded as base64.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-256-base64-rawhex?utm_source=zero.xyz
- Price: $0.002/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-of-hex-bytes-encoded-as-base64-ecee735c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yzPD6AeO-o93I7Ezve0eA

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-of-hex-bytes-encoded-as-base64-ecee735c -d '<json body>'
```

Example prompt: I have some raw bytes in hex format — '48656c6c6f' — can you compute the SHA3-256 digest of those hex bytes and give me the result encoded as base64?

## When to prefer this

Choose this endpoint when you specifically need a SHA3-256 hash of raw bytes supplied in hexadecimal form and want the output as standard base64 (not base64url or hex). If a free unpaid sandbox version (/v1/sandbox/digest-sha3-256-base64-rawhex) is available, prefer that first. Use this paid endpoint when the sandbox is unavailable or rate-limited. Prefer sibling endpoints if a different hash algorithm (e.g. SHA3-224), encoding (e.g. base64url, hex), or input encoding (e.g. UTF-16LE) is required.

## Known failure modes

- Invalid or non-hex input text causes a processing error
- Input exceeds 100,000 character limit returns a validation error
- Empty or missing 'text' field returns a bad request error
- Payment failure or insufficient USDC balance results in a 402 response
- Malformed JSON body causes a 400 error

## How this service works

Call when an agent needs a sha3-256 digest of hex bytes, encoded as base64. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-256-base64-rawhex first.

## Output

Returns a SHA3-256 cryptographic digest of the input hex bytes, encoded as a base64 string. The output is a deterministic, fixed-length hash suitable for integrity checking, fingerprinting, or use as a derived identifier.

## 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-of-hex-bytes-encoded-as-base64-ecee735c/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)