# OpenWeb Ninja ChatGPT Chat Endpoint

> OpenWeb Ninja ChatGPT Chat Endpoint is a paid API for AI agents from x402.openwebninja.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Send a message to a ChatGPT-powered AI chat endpoint and receive a text response, payable per call via x402 (USDC) with no API key required.

## Facts

- Endpoint: POST https://x402.openwebninja.com/chatgpt/chat
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/openweb-ninja-chatgpt-chat-endpoint-b3a34cd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wQ4CoWF1nBN-3y8LgNgiB

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 openweb-ninja-chatgpt-chat-endpoint-b3a34cd1 -d '<json body>'
```

Example prompt: Ask the OpenWeb Ninja ChatGPT endpoint: 'What are three creative ways to reduce household energy costs?' and return the response formatted in markdown — I'll pay the $0.005 per-call fee via USDC.

## When to prefer this

Choose this endpoint when you need ChatGPT-style AI text generation without an OpenAI account or API key, prefer pay-per-call USDC micropayments over subscriptions, or are building an agent that requires on-demand AI chat with minimal setup. It is especially suitable for agents already operating within the x402 payment ecosystem on Base, Polygon, or Arbitrum.

## Known failure modes

- Payment not received or x402 payment header missing — results in 402 Payment Required
- Invalid or malformed message field — may return a 400 Bad Request
- Upstream OpenAI API unavailability — may result in 503 or timeout
- Empty message field — may return an error or empty response
- Rate limiting from upstream ChatGPT API — possible 429 errors

## How this service works

40+ public web-data, SERP, e-commerce, real-estate, finance and AI-search APIs, payable per call over x402 (USDC on Base, Polygon, Arbitrum). No account or API key required. Most endpoints $0.003; AI-model endpoints $0.005.

## Output

A JSON object containing the AI-generated text response to the submitted message, optionally formatted in markdown depending on the markdown flag. The response reflects ChatGPT's answer to the provided prompt.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "message": {
   "type": "string"
  },
  "markdown": {
   "type": "boolean",
   "default": true
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/openweb-ninja-chatgpt-chat-endpoint-b3a34cd1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.openwebninja.com](https://www.zero.xyz/host/x402.openwebninja.com/llms.txt)