{"uid":"cap_wQ4CoWF1nBN-3y8LgNgiB","slug":"openweb-ninja-chatgpt-chat-endpoint-b3a34cd1","name":"OpenWeb Ninja ChatGPT Chat Endpoint","description":"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.","url":"https://x402.openwebninja.com/chatgpt/chat","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"message":{"type":"string"},"markdown":{"type":"boolean","default":true}}},"responseSchema":{"type":"json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ntWcYNFOQUOA53SLykoj-","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"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.","exampleUseCases":[{"title":"Quick AI answer without subscription","prompt":"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."},{"title":"Agent pipeline AI reasoning step","prompt":"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.'"},{"title":"On-demand content drafting","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:03:54.123Z","isFirstParty":false}