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

Converts input text to all-lowercase characters using a pay-per-call API over x402 on Base.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-normalize/lowercase/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-normalize-lowercase-270feaea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tUNHRIxv-tI-OZroKh4D8

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-270feaea -d '<json body>'
```

Example prompt: Can you lowercase this text for me: 'Hello World, THIS is a TEST String with Mixed CASE letters' — I need it fully normalized to lowercase.

## When to prefer this

Choose this endpoint when you need a cheap, reliable, pay-per-call lowercase normalization step in an autonomous agent pipeline without managing your own compute. At $0.0015 USDC per call it is cost-effective for high-throughput text normalization tasks. Prefer it over rolling your own logic when operating in an x402-native agent environment on Base where micropayments are already wired in.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected or truncated
- Payment failure via x402 protocol — 402 response if payment is not accepted
- Empty or missing 'text' field in request body — validation error
- Malformed JSON body — parse error response
- Network timeout on Cloudflare Worker edge node

## How this service works

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

## Output

Returns a JSON object containing the lowercased version of the submitted text string, up to 50,000 characters long.

## 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-270feaea/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)