# SHA3-256 Base64 Digest API

> SHA3-256 Base64 Digest API is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-01).

Computes a SHA3-256 cryptographic hash of input text and returns it encoded as a base64 string

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha3-256-base64?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha3-256-base64-digest-api-47b6fba4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7WKZIhWK3_oDDLyH3odIF

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-digest-api-47b6fba4 -d '<json body>'
```

Example prompt: Can you compute the SHA3-256 hash of the text 'Hello, world!' and give it back to me as base64?

## When to prefer this

Choose this endpoint when you need a SHA3-256 hash specifically encoded as base64 (not hex or base32). Prefer this over MD5 or BLAKE2 variants when SHA3-256 is required for security compliance or interoperability. Use the free sandbox endpoint (/v1/sandbox/digest-sha3-256-base64) first for testing before paying $0.004 USDC per call. Prefer this over doing hashing client-side if you need a trusted, stateless, no-network, no-LLM cryptographic computation as a service.

## Known failure modes

- Text input is empty or exceeds 100,000 character limit — returns validation error
- Missing or invalid API key — returns authentication error
- Malformed request body — returns schema validation error

## How this service works

Call when an agent needs a sha3-256 digest of text, encoded as base64. No network and no LLM. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/digest-sha3-256-base64 first.

## Output

Returns a base64-encoded SHA3-256 digest string representing the cryptographic hash of the submitted text input. The result is deterministic and identical for the same input every time.

## 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-digest-api-47b6fba4/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)