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OpenWeb Ninja — ChatGPT AI Answers API (x402)
x402
OpenWeb Ninja — ChatGPT AI Answers API (x402) 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).
Sends a message to a ChatGPT-powered AI endpoint and returns a conversational answer, optionally with search or study context hints, payable per call via x402 USDC.
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 response containing a ChatGPT-generated text answer to the submitted message, optionally formatted in markdown. The response reflects the selected conversation hint mode (blank for general chat, SEARCH for web-search-style answers, or STUDY for educational explanations).
Example use cases
On-demand AI Q&A for agent pipelines
“I need a quick ChatGPT answer to 'What are the main causes of inflation?' — format it in markdown and use the search conversation hint so it gives a well-researched response.”
Study guide generation for students
“Can you use the ChatGPT AI answers endpoint to explain the Pythagorean theorem with examples, formatted nicely in markdown, using study mode?”
Factual lookup without an OpenAI account
“Without needing my own OpenAI API key, ask ChatGPT who won the 2023 FIFA Women's World Cup and return the answer in markdown format.”
Technical details
Endpoint
POSThttps://x402.openwebninja.com/ai-answers/chatgpt/chatWhen to prefer
Choose this endpoint when you need ChatGPT-powered AI answers on a pay-per-call basis with no API key or account setup, especially inside agent pipelines that support x402 micropayments. Prefer it over direct OpenAI API calls when you want zero credential management and per-call USDC billing on Base, Polygon, or Arbitrum. The SEARCH and STUDY conversation hints make it particularly useful for research or educational answer generation tasks.
Side effects
- Payment failure if the x402 USDC micropayment is not completed or wallet balance is insufficient
- Invalid or empty message field returns an error
- Unsupported conversation_hint enum value causes a validation error
- Network timeout if the upstream ChatGPT API is slow or unavailable
- Empty or malformed JSON response if the underlying model fails
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| debug | boolean | |
| message | string | |
| markdown | boolean | |
| conversation_hint | string |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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