# BLAKE2b-512 Hex Digest (Latin-1) — agentshelf.syntexa.ch

> BLAKE2b-512 Hex Digest (Latin-1) — agentshelf.syntexa.ch is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Computes a BLAKE2b-512 cryptographic digest of Latin-1-encoded text bytes and returns the result as a lowercase hex string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2b512-hex-latin1?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blake2b-512-hex-digest-latin-1-agentshelf-syntexa-ch-f5daffcc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jGBIaMLhZWkTO1piidN5n

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 blake2b-512-hex-digest-latin-1-agentshelf-syntexa-ch-f5daffcc -d '<json body>'
```

Example prompt: Compute a BLAKE2b-512 hex digest of the Latin-1 text 'Hello, world!' using the key 'mysecret'.

## When to prefer this

Use this endpoint when you need a BLAKE2b-512 digest specifically over Latin-1 byte-encoded text returned as hex, especially when operating within an x402-payment-enabled agent pipeline. Prefer the free sandbox variant (/v1/sandbox/digest-blake2b512-hex-latin1) for testing. Choose this over SHA-256 or MD5 endpoints when BLAKE2b's speed and security properties are required, or when downstream systems expect a BLAKE2b-512 hex output.

## Known failure modes

- Text or key contains non-Latin-1 characters (e.g. multi-byte Unicode above U+00FF) — may produce an error or unexpected digest
- Key exceeds 512-character maximum — returns a validation error
- Text exceeds 100,000-character limit — returns a validation error
- Empty text or key (below minLength of 1) — returns a validation error
- Payment failure or insufficient USDC balance — HTTP 402 or payment-related error

## How this service works

Call when an agent needs a blake2b512 digest of latin1 bytes, encoded as hex. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-hex-latin1 first.

## Output

A JSON response containing the BLAKE2b-512 cryptographic digest of the provided Latin-1 text, returned as a lowercase hexadecimal string (128 hex characters representing 64 bytes).

## 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/blake2b-512-hex-digest-latin-1-agentshelf-syntexa-ch-f5daffcc/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)