# Creator Desk Starts-With Utility

> Creator Desk Starts-With Utility is a paid API for AI agents from creator-desk-x402-isolated.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Checks whether a given value starts with a specified prefix, returning the boolean result via a paid x402 micro-transaction.

## Facts

- Endpoint: POST https://creator-desk-x402-isolated.onrender.com/v1/utility/starts-with?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/creator-desk-starts-with-utility-c964d113
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C4nxFwIADdwCmLLs6qNTB

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 creator-desk-starts-with-utility-c964d113 -d '<json body>'
```

Example prompt: Check if the string 'https://example.com/path' starts with 'https://' and tell me the result.

## When to prefer this

Use this endpoint when an AI agent needs a lightweight, paid, verifiable string-prefix check as part of an automated pipeline — particularly when operating within an x402 micro-payment ecosystem and needing a simple deterministic utility without standing up custom code.

## Known failure modes

- Missing 'value' field in request body returns an error
- Malformed JSON body causes a 400-level parse error
- Payment failure or insufficient USDC balance returns a 402 Payment Required
- Passing a non-string value type may produce unexpected results if schema coercion is not applied
- Network timeout on the Render.com hosted service during cold start

## How this service works

Machine-callable x402-paid utilities for autonomous agents.

## Output

Returns a JSON object with a 'result' field (boolean or string indicating true/false) and an 'operation' field set to 'starts_with', confirming which utility was applied.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "value": {},
  "options": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": "example",
  "operation": "starts_with"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/creator-desk-starts-with-utility-c964d113/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from creator-desk-x402-isolated.onrender.com](https://www.zero.xyz/host/creator-desk-x402-isolated.onrender.com/llms.txt)