# PennyRail Number Round

> PennyRail Number Round is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).

Rounds a number to a specified precision via a paid microtransaction API endpoint

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/number.round--round-number?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-number-round-2d6b43d4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_p-AcwvL5MgaI2A0TjrC_7

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-number-round-2d6b43d4 -d '<json body>'
```

Example prompt: Round the number 3.14159 to two decimal places using PennyRail's rounding service.

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call rounding computation without standing up your own math service, or when operating inside an x402-compatible micropayment workflow where per-call billing is acceptable. Best suited for isolated, single-number rounding tasks rather than batch numerical processing.

## Known failure modes

- Missing or malformed 'input' object in request body returns a validation error
- Non-numeric input value may cause computation failure or unexpected output
- Payment failure via x402 protocol results in 402 status and no computation performed
- Network or Vercel infrastructure downtime returns 5xx error

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the rounded numeric result of the input value processed by the round function.

## 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-number-round-2d6b43d4/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)