# SignalDesk AI SHA-256 Encoding

> SignalDesk AI SHA-256 Encoding is a paid API for AI agents from x402-agent.kariguetoazul.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Computes a SHA-256 hash of the provided text and returns it as a hexadecimal string

## Facts

- Endpoint: POST https://x402-agent.kariguetoazul.workers.dev/api/encoding/sha256?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signaldesk-ai-sha-256-encoding-dbe2faf5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q2XjsLSMb5iFTKXrh9AXA

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 signaldesk-ai-sha-256-encoding-dbe2faf5 -d '<json body>'
```

Example prompt: Can you compute the SHA-256 hash of the text 'Hello, world!' and give me the hex digest?

## When to prefer this

Use this endpoint when you need a pay-per-call, serverless SHA-256 hash via x402 micropayment without managing your own cryptographic infrastructure. Best suited for agents operating in the x402 payment ecosystem that need deterministic text fingerprinting at $0.001 per call. If you have native SHA-256 available in your runtime, prefer that over a paid API call.

## Known failure modes

- Input text exceeds 4096 characters — request rejected with validation error
- Empty or missing 'text' field — may return error or hash of empty string
- Payment failure or insufficient USDC balance — 402 response blocking execution
- Service unavailability on Cloudflare Workers edge — 5xx error

## How this service works

Evidence-backed autonomous AI jobs and paid data tools. Queue/D1/cron run outside the chat; free quotas and bounded execution apply.

## Output

Returns a JSON object containing 'hex' (the SHA-256 hash of the input text as a lowercase hexadecimal string, e.g. 'ba7816bf8f01cfea...') and 'algorithm' (the string 'SHA-256'). The response is deterministic — the same input always produces the same output.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 4096,
   "description": "Text to process."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "hex": "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad",
  "algorithm": "SHA-256"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signaldesk-ai-sha-256-encoding-dbe2faf5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-agent.kariguetoazul.workers.dev](https://www.zero.xyz/host/x402-agent.kariguetoazul.workers.dev/llms.txt)