# SHA3-256 / Base64 / Latin1 Hash Digest Service

> SHA3-256 / Base64 / Latin1 Hash Digest Service is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-24).

Computes a SHA3-256 cryptographic digest of text encoded as Latin1 bytes, returning the result as a Base64 string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-256-base64-latin1?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha3-256-base64-latin1-hash-digest-service-22bfbef2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_47YBfuxTcGJCrY7uPJG4j

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-base64-latin1-hash-digest-service-22bfbef2 -d '<json body>'
```

Example prompt: Can you give me the SHA3-256 hash of the text 'Hello World' encoded as Latin1 bytes and return it in Base64 format?

## When to prefer this

Use this endpoint when you specifically need a SHA3-256 digest of text that is expected to be in the Latin1 character set, with the result encoded as standard Base64. Prefer the free sandbox endpoint (/v1/sandbox/digest-sha3-256-base64-latin1) for testing. Choose this over sibling SHA-512 variants when SHA3-256 is required by a downstream system or security standard. Choose this over hex-encoded variants when Base64 output is required for compactness or compatibility with Base64-aware systems.

## Known failure modes

- Text contains characters outside the Latin1 range (U+0000–U+00FF), which may cause encoding errors or unexpected results
- Missing or invalid API key results in authentication failure
- Input text exceeds 100,000 character limit, resulting in a rejection error
- Empty text or key fields return a validation error
- Network timeout if the service is temporarily unavailable

## How this service works

Call when an agent needs a sha3-256 digest of latin1 bytes, encoded as base64. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-256-base64-latin1 first.

## Output

Returns a Base64-encoded SHA3-256 hash digest computed from the input text treated as Latin1 bytes. The output is a compact, URL-safe string suitable for checksums, deduplication fingerprints, or data integrity verification.

## 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/sha3-256-base64-latin1-hash-digest-service-22bfbef2/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)