# 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 (all capital letters) via a paid micro-settlement API endpoint.

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/text.uppercase--upper-case
- 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-045afe86
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BYAY8Jsd44mm8_8-uuAhd

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-045afe86 -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need a simple, reliable, pay-per-use uppercase text conversion within a micro-payment (x402/USDC) workflow on PennyRail. It is ideal for agents that are already operating within the PennyRail settlement ecosystem and need lightweight string normalization without spinning up their own processing logic.

## Known failure modes

- Missing 'input' field returns a validation error
- Empty string input may return an empty string or error
- Payment failure (402) if USDC funds are insufficient or x402 header is malformed
- Network timeout if the Vercel deployment is cold-starting
- Unexpected characters or Unicode may produce undefined casing behavior

## How this service works

Machine-readable settlement service

## Output

Returns a JSON object containing the uppercased version of the submitted input string. The response schema is open-ended (additionalProperties: true), so the result likely includes a field with the transformed text output.

## 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-045afe86/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)