# ONE Engine Text Normalize Lowercase (Top 10)

> ONE Engine Text Normalize Lowercase (Top 10) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-02).

Converts the first 10 tokens/words of 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/t10?utm_source=zero.xyz
- Price: $0.03/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-top-10-31f3721f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q4JqbnkEHjxPlocYjsACH

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-top-10-31f3721f -d '<json body>'
```

Example prompt: Can you normalize this text to lowercase: 'The Quick Brown Fox Jumps Over The Lazy Dog and more words follow here'?

## When to prefer this

Choose this endpoint when you need a lightweight, cost-effective, pay-per-call text lowercasing operation within an autonomous agent workflow on Base/x402, and don't want to spin up your own string processing infrastructure. Ideal for agents that only occasionally need case normalization and want to pay micro-amounts per call rather than maintain a subscription.

## Known failure modes

- Text input missing or empty — returns validation error
- Text exceeds 50000 character limit — returns error
- Payment not included or insufficient USDC — returns 402 Payment Required
- Network timeout on Cloudflare Worker — returns 5xx error
- Malformed JSON body — returns 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 provided text (applied to the first ~10 tokens/segment as indicated by the t10 path parameter), suitable for downstream text comparison, indexing, or normalization pipelines.

## 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-top-10-31f3721f/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)