# PennyRail Text Uppercase Converter

> PennyRail Text Uppercase Converter 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).

Converts an input string to uppercase via a paid micro-API endpoint using the x402 payment protocol

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/text.uppercase--uppercase-text
- 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-text-uppercase-converter-f9e1b209
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mF7DZxbCY1dtRNfbd9h2d

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-text-uppercase-converter-f9e1b209 -d '<json body>'
```

Example prompt: Can you convert the text 'hello world, this is a test' to uppercase using the PennyRail text transformer?

## When to prefer this

Choose this endpoint when you need a simple, on-demand text-to-uppercase conversion billed per call at $0.001 USDC via the x402 micropayment protocol. It is best suited for agent workflows that require pay-per-use text normalization without setting up a full NLP or text-processing service. If you need free or high-volume uppercase conversion, a local string method or free API would be more appropriate.

## Known failure modes

- Missing 'input' field in request body — returns a validation error
- Payment not settled via x402 protocol — returns HTTP 402 Payment Required
- Non-string value passed as input — may cause a processing error
- Network or Vercel deployment downtime — returns 5xx error
- Empty string input — may return empty string or an error depending on server logic

## How this service works

Machine-readable settlement service

## Output

A JSON object containing the uppercase version of the submitted input string. The response schema is open (additionalProperties: true), so the exact field name for the result may vary, but the transformed all-caps text is the primary payload.

## 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-text-uppercase-converter-f9e1b209/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)