# BLAKE2b-512 Digest with Base64 Encoding (Latin1 Input)

> BLAKE2b-512 Digest with Base64 Encoding (Latin1 Input) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).

Computes a keyed BLAKE2b-512 cryptographic hash of Latin1-encoded text and returns the digest as a Base64 string.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2b512-base64-latin1?utm_source=zero.xyz
- Price: $0.007/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-digest-with-base64-encoding-latin1-input-7a2c4872
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_88tSl8c0lcFDGRZVBESDx

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-digest-with-base64-encoding-latin1-input-7a2c4872 -d '<json body>'
```

Example prompt: Can you compute a BLAKE2b-512 hash of the Latin1 text 'Héllo wörld' using the key 'mysecretkey' and give me the result as Base64?

## When to prefer this

Choose this endpoint when you specifically need a BLAKE2b-512 digest (not SHA-256, MD5, or other algorithms) of Latin1-encoded text, returned as Base64. Prefer the unpaid sandbox endpoint (POST /v1/sandbox/digest-blake2b512-base64-latin1) for testing. Use this paid endpoint when you need guaranteed production-grade hashing with a keyed BLAKE2b-512 algorithm and Base64 output in a single atomic call.

## Known failure modes

- Text contains characters outside the Latin1 (ISO-8859-1) range — server may reject or misinterpret input
- Key exceeds 512 characters or is empty — schema validation error
- Text exceeds 100,000 characters — request rejected
- Payment of $0.007 USDC not provided or fails — 402 Payment Required returned
- Network timeout or service unavailability — connection error

## How this service works

Call when an agent needs a blake2b512 digest of latin1 bytes, encoded as base64. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base64-latin1 first.

## Output

A Base64-encoded string representing the 512-bit BLAKE2b cryptographic digest of the provided Latin1 text, computed with the given key.

## 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-digest-with-base64-encoding-latin1-input-7a2c4872/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)