# SHA-512/256 Digest as Base64

> SHA-512/256 Digest as Base64 is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-01).

Computes a SHA-512/256 cryptographic hash of input text and returns the digest encoded as base64

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha512-256-base64?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-512-256-digest-as-base64-0aebd6a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3ZioUUrgUGFTgvYOqJyNC

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 sha-512-256-digest-as-base64-0aebd6a8 -d '<json body>'
```

Example prompt: Hash the text 'Hello, world!' using SHA-512/256 and give me the result as a base64 string.

## When to prefer this

Choose this endpoint when you need a SHA-512/256 hash specifically encoded as base64 (not hex or base32). SHA-512/256 offers stronger collision resistance than SHA-256 while producing a 256-bit output, making it suitable for security-sensitive contexts. Prefer the free sandbox endpoint (/v1/sandbox/digest-sha512-256-base64) for testing; use this paid endpoint for production workloads. If you need hex or base32 encoding, use the sibling endpoints on the same host.

## Known failure modes

- Missing or empty 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Missing or invalid API key returns an authentication error
- Payment not processed results in a 402 Payment Required response

## How this service works

Call when an agent needs a sha512-256 digest of text, encoded as base64. No network and no LLM. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/digest-sha512-256-base64 first.

## Output

Returns a base64-encoded SHA-512/256 cryptographic digest of the submitted text. The output is a fixed-length base64 string representing the 256-bit hash. No network calls or LLM inference are involved — the result 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/sha-512-256-digest-as-base64-0aebd6a8/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)