x402engine.app
x402engine — OpenAI's flagship multimodal model — strong all-around for text, vision, and reasoning
Go to this service →Our latest check (2026-10-13)
- Answering
- Yes — valid x402 payment terms
- Time to answer
- 194 ms
- Price
- $0.034 per call
- Paying buyers, last 30 days
- 2 (directory's own records)
- Paid calls, last 30 days
- 2
- Category
- AI model answers
- Address
- https://x402engine.app/api/llm/gpt-4o
Accuracy: paid answers checked against an independent record
Not yet in our paid checks. A seller we have not checked has neither passed nor failed.
For agents
This page as JSON: /sellers/f906b6a0c0b1.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).