# SHA-256 Base64 Digest (agentshelf.syntexa.ch)

> SHA-256 Base64 Digest (agentshelf.syntexa.ch) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Computes a SHA-256 cryptographic hash of input text and returns the digest encoded as a Base64 string, with no network calls or LLM involvement.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/digest-sha256-base64?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sha-256-base64-digest-agentshelf-syntexa-ch-7a5f9d15
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wJ6jHBGw8OsyY6wcy7mBn

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-256-base64-digest-agentshelf-syntexa-ch-7a5f9d15 -d '<json body>'
```

Example prompt: Can you compute the SHA-256 hash of the text 'Hello, world! This is my document content.' and give me the result as Base64?

## When to prefer this

Choose this endpoint when you need a SHA-256 hash specifically encoded as Base64 (rather than hex) and want a guaranteed offline, deterministic computation with no LLM or external network involvement. Prefer this over building your own hashing if you need a simple pay-per-use cryptographic primitive in an agent workflow. Use the free sandbox endpoint (POST /v1/sandbox/digest-sha256-base64) first to validate your integration before incurring the $0.01 USDC cost.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Invalid or missing payment (x402) results in a 402 Payment Required error
- Malformed request body returns a 400 error

## How this service works

Call when an agent needs a sha256 digest of text, encoded as base64. No network and no LLM. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/digest-sha256-base64 first.

## Output

A SHA-256 hash of the provided text, returned as a Base64-encoded string. The output is deterministic and repeatable for the same input. No additional metadata or network activity is involved.

## 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-256-base64-digest-agentshelf-syntexa-ch-7a5f9d15/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)