# agentshelf.syntexa.ch BLAKE2b-512 Base32 Digest

> agentshelf.syntexa.ch BLAKE2b-512 Base32 Digest is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-01).

Computes a BLAKE2b-512 cryptographic hash of input text and returns it encoded as a Base32 string, with optional HMAC key support.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-blake2b512-base32?utm_source=zero.xyz
- Price: $0.008/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-blake2b-512-base32-digest-db165d99
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BB4wP10K_44hNZ1-S3CyA

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-base32-digest-db165d99 -d '<json body>'
```

Example prompt: Compute a BLAKE2b-512 hash of the text 'Hello, world! This is my document content.' and give me the result encoded as Base32.

## When to prefer this

Choose this endpoint when you specifically need a BLAKE2b-512 hash (not SHA-256, SHA-3, or BLAKE2s) and require Base32 output encoding (not hex or Base64). It is ideal for systems that use Base32-friendly identifiers, case-insensitive hash strings, or interoperability with Base32-native protocols. Prefer the free sandbox endpoint /v1/sandbox/digest-blake2b512-base32 for testing before incurring the $0.008 USDC charge.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Key exceeding 512 characters is rejected
- Malformed JSON body returns a 400 error
- Payment failure (x402) if USDC balance is insufficient

## How this service works

Call when an agent needs a blake2b512 digest of text, encoded as base32. No network and no LLM. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/digest-blake2b512-base32 first.

## Output

Returns a BLAKE2b-512 cryptographic digest of the provided text, encoded as an uppercase Base32 string. No network calls or LLM inference are involved; the computation is deterministic and reproducible given the same input.

## 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-base32-digest-db165d99/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)