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x402engine Qwen Coder LLM
x402
x402engine Qwen Coder LLM is a paid API for AI agents from x402engine.app, paid per call via x402, $0.002253/call, status unknown (last checked 2026-10-12).
Runs Qwen3 Coder model inference via pay-per-call HTTP 402 micropayment, returning OpenAI-compatible chat completions optimized for code generation and reasoning.
Price / call$0.002253
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 ('qwen/qwen3-coder-next'), a choices array with the assistant's message (role, content, finish_reason), and optionally tool_calls if the model invoked a client-defined function. A top-level 'content' shortcut field is also returned. Streaming mode returns SSE chunks in the same format.
Example use cases
Automated code review bot
“Use the Qwen Coder model to review this JavaScript function and suggest improvements for readability and performance — here's the code: `function fetchData(url) { return fetch(url).then(r => r.json()) }`”
On-demand SQL query generator
“I need Qwen Coder to write a SQL query that joins an orders table with a customers table on customer_id, filters for orders placed in the last 30 days, and groups results by region with total revenue per region.”
Agent tool-use with code assistant
“Call the Qwen Coder LLM with this system prompt: 'You are a coding assistant' and this user message: 'Write a bash script that monitors a directory for new files and logs their names with timestamps' — use function calling so it can invoke my file_logger tool if needed.”
Technical details
Endpoint
POSThttps://x402engine.app/api/llm/qwen-coder?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a coding-specialized LLM (Qwen3-Coder) with no subscription or rate-limit overhead, paying only $0.002253 per call in USDC. Prefer it over general-purpose LLMs for programming tasks, code generation, and technical reasoning. Ideal for agents that need OpenAI-compatible chat completions with optional streaming and function-calling support, settled via x402 micropayment on Base, MegaETH, or Solana.
Side effects
- Payment not settled — 402 response if USDC/USDm payment is missing or insufficient
- Invalid messages array — 422 if required 'messages' field or 'role' is missing
- Malformed tool definition — error if function schema is invalid
- Context length exceeded — error if message history exceeds model's token limit
- Model unavailable — 503 if upstream Qwen model is temporarily down
- Streaming timeout — connection may drop on very long generations
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"model": "qwen/qwen3-coder-next",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
],
"content": "Hello!"
}
}Tags
x402
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