# agentshelf.syntexa.ch SHAKE-128 Base64 Digest

> agentshelf.syntexa.ch SHAKE-128 Base64 Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Computes a SHAKE-128 (XOF) cryptographic digest of input text and returns the result encoded as base64.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-shake128-base64?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-shake-128-base64-digest-8e1b484f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__PaHf11X9IaX2gwRPDMFw

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 agentshelf-syntexa-ch-shake-128-base64-digest-8e1b484f -d '<json body>'
```

Example prompt: Can you compute the SHAKE-128 digest of the text 'Hello, world! This is my message.' and give me the result encoded as base64?

## When to prefer this

Choose this endpoint when you need a SHAKE-128 (XOF) hash specifically encoded as base64 and want a simple, deterministic, low-latency computation with no external dependencies. Prefer the free sandbox endpoint (/v1/sandbox/digest-shake128-base64) for testing. Use this paid endpoint for production use when you need guaranteed availability and can pay $0.002 USDC per call. If you need a different hash algorithm (SHA-224, SHA-3, SHA-512) or encoding (hex, base32, base64url), consider the sibling endpoints on the same host.

## Known failure modes

- Text or key field missing or empty (minLength:1 constraint violated — returns 4xx validation error)
- Text exceeds 100,000 character limit — returns 4xx error
- Payment of exactly $0.002 USDC not provided — returns 402 Payment Required
- Malformed JSON body — returns 400 Bad Request

## How this service works

Call when an agent needs a shake128 digest of text, encoded as base64. No network and no LLM. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/digest-shake128-base64 first.

## Output

Returns a base64-encoded SHAKE-128 (extendable output function) digest of the provided input text. The response is a deterministic hash string with no network calls or AI inference 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/agentshelf-syntexa-ch-shake-128-base64-digest-8e1b484f/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)