# ONE Engine Text Capitalize

> ONE Engine Text Capitalize is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0009/call, status unknown (last checked 2026-10-02).

Capitalizes the first letter of a text string, returning the transformed result.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v1/text/capitalize?utm_source=zero.xyz
- Price: $0.0009/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-capitalize-2abd78e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FadfJRd_75ubA7YZ2Bfnl

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-capitalize-2abd78e6 -d '<json body>'
```

Example prompt: Capitalize this string for me: 'hello world' — just make the first letter uppercase.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call string capitalization utility without spinning up your own text processing logic. It is ideal for AI agents on Base that already use x402 micropayments and need to normalize or format short strings cheaply ($0.0009 USDC per call). It is not suitable for bulk batch processing of large text corpora or for full title-case/all-caps transformations.

## Known failure modes

- Missing or empty 'text' field in request body — likely returns a 400 error or unexpected output
- Non-string value for 'text' field — may cause a type error or malformed response
- Network timeout or Cloudflare Worker cold-start latency on first call
- Payment failure via x402 if USDC balance is insufficient — 402 response returned before processing

## How this service works

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

## Output

A JSON object with a 'text' field containing the input string with its first character capitalized (e.g. {"text": "One engine"}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "One engine"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-text-capitalize-2abd78e6/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)