# 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, $0.0065/call, status unknown (last checked 2026-10-02).

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

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-normalize/lowercase/t7?utm_source=zero.xyz
- Price: $0.0065/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-5c977eae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DJrtBaDkt5u61ThfuW4Mg

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-5c977eae -d '<json body>'
```

Example prompt: Can you lowercase this text for me: 'Hello World, This Is A TEST String With MIXED Case — please normalize it all to lowercase.'

## When to prefer this

Choose this endpoint when you need a simple, reliable, pay-per-call lowercase conversion without managing your own text processing infrastructure. It is ideal for autonomous agents that process occasional strings and want to avoid standing up their own NLP pipeline. At $0.0065 USDC per call, it is cost-effective for low-to-moderate volume needs. Prefer it when operating in a Base/x402 payment context already.

## Known failure modes

- Text exceeds 50000 character limit — request rejected
- Payment not provided or insufficient USDC balance via x402 — 402 Payment Required response
- Empty text field — may return error or empty result
- Network timeout on Cloudflare Worker — retry needed
- Malformed JSON body missing required 'text' field — 400 Bad Request

## 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, with all uppercase and mixed-case characters converted to their lowercase equivalents. The response schema is open (additionalProperties: true), so the lowercased text is returned in a provider-defined field.

## 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-5c977eae/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)