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x402engine Gemini 3 Flash LLM API
x402
x402engine Gemini 3 Flash LLM API is a paid API for AI agents from x402engine.app, paid per call via x402, $0.00829/call, status unknown (last checked 2026-10-12).
Runs Google's Gemini 3 Flash model via an OpenAI-compatible chat completions interface, pay-per-call with USDC micropayments
Price / call$0.00829
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
An OpenAI-compatible JSON response containing the model name ('google/gemini-3-flash-preview'), an array of choices each with an assistant message (role, content), finish_reason, and a top-level 'content' field with the response text. When streaming is enabled, returns OpenAI-compatible SSE chunks.
Example use cases
Coding assistant for AI agent
“Use Gemini 3 Flash to review this Python function and suggest optimizations: 'def fib(n): return n if n <= 1 else fib(n-1)+fib(n-2)' — I want a fast answer, billed per call.”
Multimodal image understanding
“Send this product image URL to Gemini 3 Flash and ask it to describe what's in the image and whether it looks defective.”
Tool-calling agent reasoning step
“Run a Gemini 3 Flash completion with a 'get_weather' tool definition and the user message 'What's the weather in Paris?' so it can decide whether to call the tool.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/gemini-3-flash?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, cost-effective LLM inference from Google's Gemini 3 Flash model without a monthly subscription, paying only per call in USDC. Ideal for AI agents with variable or bursty workloads, multimodal inputs (images, files, video URLs), or tool-calling pipelines. Prefer over direct Google API when you want HTTP 402 micropayment billing on Base, MegaETH, or Solana.
Side effects
- Payment not settled — request rejected before inference begins
- Insufficient USDC balance — 402 response with payment requirements
- Malformed messages array — 400 validation error
- Unsupported content type or role — schema validation failure
- Model unavailable or overloaded — 503 or timeout
- Streaming not supported for all configurations — falls back or errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "google/gemini-3-flash-preview",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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