# Delx Commerce — Reverse String API

> Delx Commerce — Reverse String API 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).

Reverses the characters of an input string, returning the mirrored text with character count metadata.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/reverse-string?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-reverse-string-api-e9b3875d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__6phGb_OuKN0raHBTrIcB

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-reverse-string-api-e9b3875d -d '<json body>'
```

Example prompt: Can you reverse the string 'hello agent world' for me using Delx?

## When to prefer this

Choose this endpoint when you need a pay-per-call, no-signup string reversal with verifiable on-chain payment via USDC on Base or Solana. Useful in agent pipelines where accountable micro-payments per operation are preferred over subscription APIs, or when a lightweight utility operation is needed without infrastructure overhead.

## Known failure modes

- Input text exceeds 100,000 character limit — request rejected
- Missing or empty 'text' field in request body — validation error
- Payment failure via x402 — 402 Payment Required response before processing
- Malformed JSON body — 400 Bad Request

## How this service works

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

## Output

A JSON object containing the reversed text string, the schema version identifier ('delx/reverse-string/v1'), and the character length of the original input string.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 100000,
   "description": "Primary text input (max 100k chars). Processed first-party; not retained as a dataset."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "text": "dlrow tnega olleh",
  "schema": "delx/reverse-string/v1",
  "source_len": 17
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-reverse-string-api-e9b3875d/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)