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x402engine GPT-5.6 Sol Pro LLM API
x402
x402engine GPT-5.6 Sol Pro LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.035735/call, status unknown (last checked 2026-10-11).
Call OpenAI's GPT-5.6 Sol Pro model via a pay-per-call HTTP 402 micropayment endpoint, paying with USDC on Solana
Price / call$0.035735
Success—
StatusUnknown
How this service works
125 production APIs behind HTTP 402 micropayments. 87 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.
Output
Returns a JSON object with the model name ('openai/gpt-5.6-sol-pro'), a choices array containing the assistant's message with role and content fields, a finish_reason ('stop' or similar), and a top-level content field with the response text.
Example use cases
Pay-per-call code review assistant
“Run this Python function through GPT-5.6 Sol Pro and ask it to identify any bugs or security issues: 'def get_user(id): return db.execute("SELECT * FROM users WHERE id=" + id)'”
On-demand research summarization
“Send the following paragraph to GPT-5.6 Sol Pro and ask it to summarize the key findings in three bullet points: 'Recent studies show that intermittent fasting reduces inflammatory markers by up to 40% in adults over 50, with the 16:8 protocol showing the most consistent results across diverse populations.'”
Autonomous agent reasoning step
“I need GPT-5.6 Sol Pro to decide which of these three actions my trading bot should take next given the market data below — pay per call so I'm not locked into a subscription: [market data here]”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/gpt-5.6-sol-pro?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need GPT-5.6 Sol Pro specifically, want to pay per call in USDC on Solana without an OpenAI subscription, are building an autonomous agent that self-funds inference via crypto micropayments, or need the highest-capability OpenAI model available on a usage-based basis with no monthly commitment.
Side effects
- Insufficient USDC balance on Solana wallet causes HTTP 402 payment failure
- Invalid or malformed message payload returns 400 error
- Model overload or upstream OpenAI outage causes 503 or timeout
- Unsupported parameters for this model variant cause validation errors
- Network latency on Solana payment settlement adds delay
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "openai/gpt-5.6-sol-pro",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"