# PennyRail SHA-256 Multi-Hash

> PennyRail SHA-256 Multi-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 SHA-256 cryptographic hashes over one or more input values in a single call

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/crypto.hash-multi--sha256-hash
- 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-multi-hash-8eeec5b6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YlSHvcXT_6vxpSj10unJ2

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-multi-hash-8eeec5b6 -d '<json body>'
```

Example prompt: Hash these three strings for me using SHA-256 — 'hello world', 'foo bar', and 'baz qux' — and give me back all three digests.

## When to prefer this

Choose this endpoint when you need SHA-256 hashes computed server-side via a pay-per-call micropayment model (x402/USDC), especially when hashing multiple inputs in a single round-trip. Prefer it over local hashing when operating in environments without native crypto libraries, or when you need a neutral third-party hash service for auditability. The $0.001 USDC cost makes it suitable for low-volume, high-trust use cases.

## Known failure modes

- Missing or malformed 'input' object returns a 400-level error
- Empty input object may return empty or null hash results
- Network timeout on Vercel serverless cold start
- Payment failure (x402) if USDC balance is insufficient — call is rejected before execution
- Oversized payloads may be rejected or time out

## How this service works

Machine-readable settlement service

## Output

Returns an object containing one or more SHA-256 hex digest strings corresponding to the input values provided. The response is schema-flexible (additionalProperties: true), typically mapping input keys to their computed hash values.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-sha-256-multi-hash-8eeec5b6/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)