# agentshelf.syntexa.ch Blake2b-512 Base64url Latin1 Digest

> agentshelf.syntexa.ch Blake2b-512 Base64url Latin1 Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Computes a BLAKE2b-512 cryptographic digest of Latin-1 encoded text, returning the result encoded as base64url.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2b512-base64url-latin1?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-syntexa-ch-blake2b-512-base64url-latin1-digest-45359fae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IbEiHwMvSdDsJcgjN_rQj

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-blake2b-512-base64url-latin1-digest-45359fae -d '<json body>'
```

Example prompt: Can you compute the BLAKE2b-512 hash of the Latin-1 text 'Hello World' using the key 'mysecretkey' and give me the result as a base64url string?

## When to prefer this

Choose this endpoint when you specifically need a BLAKE2b-512 hash of Latin-1 text with base64url output encoding, especially when a keyed (MAC-style) digest is required. Prefer the free sandbox variant (/v1/sandbox/digest-blake2b512-base64url-latin1) for testing. Use this paid endpoint for production workloads where guaranteed availability matters.

## Known failure modes

- Input text contains characters outside Latin-1 range — may cause encoding errors or unexpected results
- Key exceeds 512-character maximum — rejected with validation error
- Empty text or key fields — rejected due to minLength:1 constraint
- Payment not provided or insufficient — 402 Payment Required response
- Service unavailable — 5xx error with no digest returned

## How this service works

Call when an agent needs a blake2b512 digest of latin1 bytes, encoded as base64url. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base64url-latin1 first.

## Output

Returns a base64url-encoded BLAKE2b-512 cryptographic digest of the provided Latin-1 encoded input text, optionally keyed with the supplied key string.

## 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-blake2b-512-base64url-latin1-digest-45359fae/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)