# PennyRail Number Round – Round Decimals

> PennyRail Number Round – Round Decimals is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-21).

Rounds a numeric value to a specified number of decimal places via a paid microservice API

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/number.round--round-decimals?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-number-round-round-decimals-78ef69b1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1cYW_GBLKBV-D7z1EKsgV

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-round-decimals-78ef69b1 -d '<json body>'
```

Example prompt: Round the number 3.14159 to 2 decimal places for me.

## When to prefer this

Choose this endpoint when you need a simple, paid microservice call to round a number to a specific decimal precision, especially within an x402 payment-enabled agent workflow where per-call micropayments are acceptable and you want a stateless, deterministic numeric operation without spinning up local computation.

## Known failure modes

- Missing or malformed 'input' object returns a 400-level error
- Non-numeric input value causes computation failure
- Negative decimal place count may produce unexpected behavior
- Payment failure (insufficient USDC balance) results in 402 response blocking the call

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the rounded numeric result after applying the specified decimal rounding operation to the input number.

## 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-round-decimals-78ef69b1/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)