# 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, $0.0015/call, status unknown (last checked 2026-10-02).

Converts input text to uppercase (all capital letters) via a pay-per-call API using x402 on Base.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-normalize/uppercase/t4?utm_source=zero.xyz
- Price: $0.0015/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-66af59b1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lVfzS5UobhSI8eriRGcpC

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-66af59b1 -d '<json body>'
```

Example prompt: Can you convert this text to all uppercase letters: 'The quick brown fox jumps over the lazy dog'?

## When to prefer this

Choose this endpoint when you need a reliable, low-cost, pay-per-call uppercase conversion without managing your own string processing infrastructure, especially in agent workflows already using x402 micropayments on Base. Ideal for agentic pipelines that need stateless, single-purpose text normalization utilities at $0.0015 per call.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected
- Empty text field — likely returns an error or empty result
- Payment failure via x402 — 402 response if USDC balance insufficient or payment not attached
- Malformed JSON body — 400 bad request
- Network timeout on the Cloudflare Workers edge

## How this service works

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

## Output

A JSON object containing the uppercased version of the submitted text, with all alphabetic characters converted to their capital equivalents and non-alphabetic characters preserved.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "Text up to 50000 characters"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-text-uppercase-converter-66af59b1/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)