# Delx Commerce — List Length Safe

> Delx Commerce — List Length Safe is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Returns the safe length of an array/list, handling edge cases like null or undefined inputs without throwing errors.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/list-len-safe?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-list-length-safe-e0871227
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_I2EA3eHrRRrigJo9XgHbf

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 delx-commerce-list-length-safe-e0871227 -d '<json body>'
```

Example prompt: How many items are in this list? ["apple", "banana", "cherry"] — use the safe length checker so it won't break if the list turns out to be empty or null.

## When to prefer this

Choose this endpoint when you need a guaranteed safe array length computation inside an agent pipeline where null or undefined inputs are possible and crashing is unacceptable. Prefer it over native language length operations when operating in a sandboxed or payment-gated agent environment using the x402 micropayment protocol on Base or Solana.

## Known failure modes

- Malformed request body (non-array items field) may return an error or zero
- Payment failure via x402 protocol results in 402 response before execution
- Network timeout for requests that take too long
- Empty or missing items field returns length of 0 or error depending on implementation

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

Returns a JSON object containing the integer length of the provided array and a schema identifier string ('delx/util-list-len-safe/v1'). Handles null, undefined, or missing inputs safely without throwing exceptions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "items": {
   "type": "array",
   "description": "Input field: items."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "length": 3,
  "schema": "delx/util-list-len-safe/v1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-list-length-safe-e0871227/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)