# x402engine Qwen3.7-Max LLM

> x402engine Qwen3.7-Max LLM is a paid API for AI agents from x402engine.app, paid per call via x402, $0.014078/call, status unknown (last checked 2026-10-12).

Runs inference on Alibaba's Qwen3.7-Max large language model via a pay-per-call HTTP 402 micropayment endpoint

## Facts

- Endpoint: POST https://x402engine.app/api/llm/qwen3.7-max?utm_source=zero.xyz
- Price: $0.014078/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402engine-qwen3-7-max-llm-583a5973
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cwsPud9vk8wBD5F8WMiN7

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402engine-qwen3-7-max-llm-583a5973 -d '<json body>'
```

Example prompt: Send this conversation to Qwen3.7-Max and get back a response: system message is 'You are a helpful coding assistant', user message is 'Write a Python function to parse ISO 8601 dates', and enable streaming.

## When to prefer this

Choose this endpoint when you need Alibaba's Qwen3.7-Max specifically — a strong performer on Chinese-language tasks, multilingual reasoning, and coding — and want pay-per-call USDC micropayment billing without committing to a subscription. Prefer it over OpenAI or Anthropic endpoints when Qwen's architecture or training data is a better fit, or when you want to compare outputs across LLM providers on a per-call basis.

## Known failure modes

- Payment failure — insufficient USDC/USDm balance results in HTTP 402 not settled
- Invalid messages array — missing required 'role' or 'content'/'tool_calls' fields returns validation error
- Token limit exceeded — very long conversations may be truncated or rejected
- Unsupported parameter for model — seed, top_k, logprobs may not be supported by all model configurations
- Streaming timeout — SSE connection may drop on slow networks after payment is made
- Rate limiting — excessive concurrent calls may be throttled

## 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 an OpenAI-compatible JSON response containing the model name ('qwen/qwen3.7-max'), a choices array with the assistant message (role, content, optional tool_calls), finish_reason, and a top-level content field. When streaming is enabled, returns OpenAI-compatible SSE chunks after payment settlement.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "bodyType",
    "body",
    "method"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "messages"
     ],
     "properties": {
      "seed": {
       "type": "integer",
       "description": "Model-supported seed; see /docs/llm-capabilities.md."
      },
      "stop": {
       "oneOf": [
        {
         "type": "string"
        },
        {
         "type": "array",
         "items": {
          "type": "string"
         },
         "maxItems": 4
        }
       ],
       "description": "Model-supported stop; see /docs/llm-capabilities.md."
      },
      "tools": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "function"
        ],
        "properties": {
         "type": {
          "enum": [
           "function"
          ],
          "type": "string"
         },
         "function": {
          "type": "object",
          "properties": {
           "name": {
            "type": "string"
           },
           "strict": {
            "type": "boolean"
           },
           "parameters": {
            "type": "object"
           },
           "description": {
            "type": "string"
           }
          }
         }
        }
       },
       "description": "Client-executed function definitions; return results using role=tool and tool_call_id."
      },
      "top_k": {
       "type": "integer",
       "description": "Model-supported top_k; see /docs/llm-capabilities.md."
      },
      "top_p": {
       "type": "number",
       "description": "Model-supported top_p; see /docs/llm-capabilities.md."
      },
      "stream": {
       "type": "boolean",
       "description": "Return live OpenAI-compatible SSE after payment settlement."
      },
      "logprobs": {
       "type": "boolean",
       "description": "Model-supported logprobs; see /docs/llm-capabilities.md."
      },
      "messages": {
       "type": "array",
       "items": {
        "type": "object",
        "anyOf": [
         {
          "required": [
           "content"
          ]
         },
         {
          "required": [
           "tool_calls"
          ]
         }
        ],
        "required": [
         "role"
        ],
        "properties": {
         "name": {
          "type": "
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "model": "qwen/qwen3.7-max",
  "choices": [
   {
    "index": 0,
    "message": {
     "role": "assistant",
     "content": "Hello!"
    },
    "finish_reason": "stop"
   }
  ],
  "content": "Hello!"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402engine-qwen3-7-max-llm-583a5973/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402engine.app](https://www.zero.xyz/host/x402engine.app/llms.txt)