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x402engine GPT-5.6 Terra Pro LLM API
x402
x402engine GPT-5.6 Terra Pro LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.03574/call, status unknown (last checked 2026-10-20).
Calls OpenAI's GPT-5.6 Terra Pro model via a pay-per-call HTTP 402 micropayment endpoint, supporting chat completions with tool use, streaming, and file/image inputs.
Price / call$0.03574
Success—
StatusUnknown
How this service works
x402engine — OpenAI's higher-compute Terra tier for demanding reasoning workloads
Output
Returns an OpenAI-compatible chat completion JSON object containing the model name ('openai/gpt-5.6-terra-pro'), a choices array with the assistant message, finish reason, and optionally tool_calls or reasoning fields. If streaming is enabled, returns SSE events in OpenAI format.
Example use cases
Agentic reasoning with tool calling
“Use GPT-5.6 Terra Pro to answer my user's question about today's stock prices — pass it a get_stock_price function definition so it can call the tool, and stream the response.”
Document analysis with file input
“Send this PDF attachment to GPT-5.6 Terra Pro and ask it to summarize the key findings and flag any financial risks mentioned in the document.”
Automated content drafting pipeline
“I need GPT-5.6 Terra Pro to draft a professional LinkedIn post based on this bullet list of achievements: 'launched product in 3 markets, grew revenue 40%, hired 12 engineers' — keep it under 200 words and make the tone confident but not boastful.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/gpt-5.6-terra-pro?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need GPT-5.6 Terra Pro specifically — OpenAI's most capable frontier model — without managing OpenAI API keys or subscriptions. Ideal for agents that need pay-per-call billing in USDC, want OpenAI-compatible request/response format, require tool calling or file/image inputs, and want to avoid rate limit management. Prefer over other LLMs on x402engine when task complexity demands frontier-level reasoning.
Side effects
- 402 Payment Required if micropayment header is missing or insufficient
- 400 Bad Request if messages array is empty or malformed
- Tool call results not provided in follow-up messages cause incomplete completions
- Seed parameter ignored if model does not support deterministic generation
- Truncated response if token limit exceeded mid-stream
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "openai/gpt-5.6-terra-pro",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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