# ONE Engine Text Includes Check

> ONE Engine Text Includes Check 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).

Checks whether a given search string is contained within a provided text, returning a boolean match result.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v1/text/includes?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-includes-check-3162b18d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M-vfDPFcxzLz66hKxwArr

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-includes-check-3162b18d -d '<json body>'
```

Example prompt: Check if the text 'The quick brown fox jumps over the lazy dog' includes the word 'fox'.

## When to prefer this

Use this endpoint when you need a fast, cheap, deterministic substring check on a text string without running a full search index or regex engine yourself. At $0.0009 USDC per call it is ideal for high-frequency agent pipelines that need to gate on keyword presence. Prefer this over LLM-based contains-checks when latency and cost matter and the match is purely literal.

## Known failure modes

- Missing 'text' or 'search' fields in request body returns an error
- Empty string inputs may return unexpected matches or errors
- Payment failure via x402 results in 402 response and no result
- Very large text inputs may exceed payload limits

## How this service works

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

## Output

Returns a JSON object with a single boolean field 'matches' indicating whether the search string was found within the provided text.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "matches": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-text-includes-check-3162b18d/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)