# PennyRail SHA-256 Crypto Hash

> PennyRail SHA-256 Crypto Hash is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Computes a SHA-256 cryptographic hash of an input string, delivered as a paid micro-transaction API call

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/crypto.sha256--sha256
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-sha-256-crypto-hash-2a41205c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XttEwq_Gm9xLFBOsSrrzH

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 pennyrail-sha-256-crypto-hash-2a41205c -d '<json body>'
```

Example prompt: Can you compute the SHA-256 hash of the string 'hello world' for me?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-use SHA-256 hash computation without standing up your own hashing infrastructure, particularly in agent pipelines where you want to pay micro-amounts per call rather than maintain a dedicated service. Best suited for lightweight, occasional hashing needs within x402-compatible payment flows.

## Known failure modes

- Missing 'input' field returns a validation error
- Payment not provided or insufficient USDC balance causes a 402 Payment Required response
- Very large input strings may exceed payload limits
- Non-string input types may cause schema validation failure

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the SHA-256 hash (hex-encoded digest) of the provided input string, suitable for integrity checking, fingerprinting, or cryptographic verification use cases.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-sha-256-crypto-hash-2a41205c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)