# Delx Commerce — Ensure Prefix

> Delx Commerce — Ensure Prefix 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).

Ensures a given string starts with a specified prefix, adding it if absent and reporting whether it was already present

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/ensure-prefix?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-ensure-prefix-0d369f06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_F-BqqIR-ReKEbtxQX3Auv

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-ensure-prefix-0d369f06 -d '<json body>'
```

Example prompt: Make sure the text 'api.delx.ai' starts with 'https://' — add it if it's missing and tell me if it was already there.

## When to prefer this

Use this endpoint when an agent needs a guaranteed-idempotent, verifiable, pay-per-result string prefix normalization step — especially for URL canonicalization or path normalization inside automated pipelines where correctness must be confirmed programmatically. It is preferable over local string logic when auditability, verifiable delivery, or pipeline consistency across distributed agents is required.

## Known failure modes

- Missing required 'text' or 'prefix' field returns a validation error
- Empty string inputs may produce unexpected normalization results
- Payment failure via x402 (insufficient USDC balance) blocks the request
- Network timeout if the Delx Commerce endpoint is temporarily unavailable

## 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 final normalized text (with the prefix guaranteed), the prefix that was checked, the schema identifier ('delx/util-ensure-prefix/v1'), and a boolean 'already_present' indicating whether the prefix was already in the original input string.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "description": "Input field: text."
  },
  "prefix": {
   "type": "string",
   "description": "Input field: prefix."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "https://api.delx.ai",
  "prefix": "https://",
  "schema": "delx/util-ensure-prefix/v1",
  "already_present": false
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-ensure-prefix-0d369f06/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)