# PennyRail MD5 Multi-Hash

> PennyRail MD5 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 MD5 hashes for one or more input values in a single API call, returning hex digest results per input

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/crypto.hash-multi--md5
- 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-md5-multi-hash-d7674d5d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y2aZXbr83Aouvpg40xNu5

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-md5-multi-hash-d7674d5d -d '<json body>'
```

Example prompt: Can you compute the MD5 hashes for these three strings: 'hello world', 'foo bar', and 'test123'?

## When to prefer this

Choose this endpoint when you need to compute MD5 hashes for one or more inputs in a single round-trip without standing up your own hashing infrastructure, especially in agent workflows or serverless pipelines where invoking a paid micro-service per computation is acceptable. It is particularly useful when batching multiple hash computations to avoid repeated API calls.

## Known failure modes

- Missing required 'input' field returns a validation error
- Malformed or non-object input body returns 400-level error
- Payment not provided or rejected results in 402 Payment Required
- Empty input object may return empty results or an error
- Overly large input payloads may time out or be rejected
- Network or Vercel cold-start latency may occasionally cause timeout

## How this service works

Machine-readable settlement service

## Output

Returns an object containing MD5 hex digest strings keyed to each provided input, allowing the caller to map original inputs to their corresponding hash values in a single response.

## 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-md5-multi-hash-d7674d5d/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)