# ONE Engine Number Between Check

> ONE Engine Number Between 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 numeric value falls within a specified min/max range, returning a boolean result.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v1/number/between?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-number-between-check-0ed29cab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fXofxMP9OdH2gMTlqS1D-

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-number-between-check-0ed29cab -d '<json body>'
```

Example prompt: Check if 75 is between 50 and 100 — just tell me true or false.

## When to prefer this

Choose this endpoint when you need a lightweight, cheap, pay-per-call range validation without standing up your own logic — ideal for autonomous agents that need to make quick numerical boundary checks inline with other workflows at minimal cost ($0.0009 USDC per call). Prefer it when you want stateless, serverless range checks without API key management.

## Known failure modes

- Missing required fields (value, min, or max) may result in an error or unexpected behavior
- Non-numeric inputs could cause validation failures
- Payment failure via x402 protocol would prevent the call from completing
- If min is greater than max, the result may be undefined or incorrect

## How this service works

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

## Output

A JSON object with a single boolean field 'between' indicating whether the provided value falls within the inclusive min/max range (e.g. {"between": true}).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "max": {
   "type": "number"
  },
  "min": {
   "type": "number"
  },
  "value": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-number-between-check-0ed29cab/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)