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OpenWeb Ninja ChatGPT Chat Endpoint
x402
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.
Price / call$0.005
Success—
StatusUnknown
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.
Example use cases
Quick AI answer without subscription
“I need to ask ChatGPT why the sky is blue and get a clear, markdown-formatted explanation — just use the pay-per-call AI chat endpoint so I don't have to set up an OpenAI account.”
Agent pipeline AI reasoning step
“In my automation workflow, send the following text to the ChatGPT chat endpoint and return the plain-text answer: 'Summarize the key differences between REST and GraphQL APIs in three bullet points.'”
On-demand content drafting
“Use the ChatGPT chat API to draft a short professional bio for a software engineer named Alex who specializes in distributed systems — return it in markdown format.”
Technical details
Endpoint
POSThttps://x402.openwebninja.com/chatgpt/chatWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| message | string | |
| markdown | boolean |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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