# ONE Engine Text Uppercase Converter

> ONE Engine Text Uppercase Converter is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0009/call, status unknown (last checked 2026-10-02).

Converts a given text string to all uppercase characters via a pay-per-call API using x402 on Base.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v1/text/uppercase?utm_source=zero.xyz
- Price: $0.0009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-text-uppercase-converter-a15351a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y5xY_0rfUa4WiIeHHU19-

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 one-engine-text-uppercase-converter-a15351a7 -d '<json body>'
```

Example prompt: Convert the text 'hello world' to uppercase for me.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call text uppercasing operation within an autonomous agent pipeline on Base using x402 micropayments, especially when you want to avoid embedding heavier NLP or string libraries and prefer a simple serverless utility call.

## Known failure modes

- Missing or empty 'text' field in request body may return an error or empty result
- Payment failure via x402 if wallet has insufficient USDC balance on Base
- Network timeout or Cloudflare Worker unavailability returning 5xx errors
- Malformed JSON body causing a 400 Bad Request response

## How this service works

Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.

## Output

A JSON object containing the field 'text' with the input string converted to all uppercase letters (e.g. {"text": "HELLO WORLD"}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "HELLO WORLD"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-text-uppercase-converter-a15351a7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from one-search.one-engine.workers.dev](https://www.zero.xyz/host/one-search.one-engine.workers.dev/llms.txt)