# ONE Engine Text Normalize Lowercase

> ONE Engine Text Normalize Lowercase is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

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

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-normalize/lowercase/t3?utm_source=zero.xyz
- Price: $0.001/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-normalize-lowercase-55460fe2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dapTtkZQjilKYh0zhB1Qs

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-normalize-lowercase-55460fe2 -d '<json body>'
```

Example prompt: Can you lowercase all the text in this string for me: 'Hello World, THIS Is A TEST of Mixed Case Text!'

## When to prefer this

Prefer this endpoint when you need a simple, reliable, pay-per-call lowercase conversion without managing any infrastructure, and when operating in an autonomous agent context that already uses x402 micropayments on Base. Ideal for agents that need deterministic, stateless string normalization at $0.001 USDC per call with no subscription or API key overhead.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected with validation error
- Payment failure via x402 on Base — 402 response if USDC balance insufficient
- Empty or missing 'text' field — required field validation error
- Network timeout on Cloudflare Workers edge — transient 5xx error

## How this service works

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

## Output

A JSON object containing the lowercased version of the input text, with all uppercase and mixed-case characters converted to their lowercase equivalents.

## 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-normalize-lowercase-55460fe2/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)