{"uid":"cap_A7L0YIMWh7EeNlpVvhwm8","slug":"x402-gateway-production-up-railway-app-95f647a8","name":"Qwen3.5 LLM API (x402 Gateway)","description":"Alibaba's latest model — 1M context, strong multilingual and coding capabilities","url":"https://x402-gateway-production.up.railway.app/api/llm/qwen3.5?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"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":"string"},"role":{"enum":["system","developer","user","assistant","tool"],"type":"string"},"content":{"oneOf":[{"type":"string"},{"type":"null"},{"type":"array","items":{"type":"object","required":["type"],"properties":{"type":{"enum":["text","image_url","video_url"],"type":"string"}},"additionalProperties":true},"maxItems":100,"minItems":1}]},"refusal":{"type":["string","null"]},"reasoning":{"type":"string"},"tool_calls":{"type":"array","items":{"type":"object"}},"annotations":{"type":"array","items":{"type":"object"}},"tool_call_id":{"type":"string"},"cache_control":{"type":"object"},"reasoning_details":{"type":"array","items":{"type":"object"}}},"additionalProperties":false},"maxItems":100,"minItems":1,"description":"Text or model-supported multimodal messages; assistant tool calls may have null content"},"reasoning":{"type":"object","description":"Model-supported reasoning; see /docs/llm-capabilities.md."},"max_tokens":{"type":"integer","example":1024,"description":"Total output budget, including reasoning. Use this or max_completion_tokens."},"temperature":{"type":"number","description":"Model-supported temperature; see /docs/llm-capabilities.md."},"tool_choice":{"oneOf":[{"enum":["auto","none","required"],"type":"string"},{"type":"object"}],"description":"Model-supported tool_choice; see /docs/llm-capabilities.md."},"top_logprobs":{"type":"integer","description":"Model-supported top_logprobs; see /docs/llm-capabilities.md."},"stream_options":{"type":"object","description":"Optional include_usage boolean; usage is always requested upstream."},"response_format":{"type":"object","description":"Model-supported response_format; see /docs/llm-capabilities.md."},"presence_penalty":{"type":"number","description":"Model-supported presence_penalty; see /docs/llm-capabilities.md."},"frequency_penalty":{"type":"number","description":"Model-supported frequency_penalty; see /docs/llm-capabilities.md."},"include_reasoning":{"type":"boolean","description":"Model-supported include_reasoning; see /docs/llm-capabilities.md."},"max_completion_tokens":{"type":"integer","description":"Alias for total output budget; bounded by model maxOutputTokens."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["choices","content"],"properties":{"model":{"type":"string"},"usage":{"type":"object","description":"Provider token and usage accounting, when returned."},"choices":{"type":"array","items":{"type":"object","properties":{"index":{"type":"integer"},"message":{"type":"object","properties":{"role":{"type":"string"},"content":{"type":["string","null"]},"tool_calls":{"type":"array","items":{"type":"object"}}}},"finish_reason":{"type":["string","null"]}}}},"content":{"type":"string","description":"Convenience copy of the first assistant message's text."}}}}}}},"responseSchema":null,"example":{"request":{"messages":[{"role":"user","content":"Hello"}]},"response":{"model":"qwen/qwen3.5-plus-20260216","usage":{"cost":0.00049738,"is_byok":false,"cost_details":{"upstream_inference_cost":0.00049738,"upstream_inference_prompt_cost":0.00000286,"upstream_inference_completions_cost":0.00049452},"total_tokens":328,"prompt_tokens":11,"completion_tokens":317,"prompt_tokens_details":{"audio_tokens":0,"video_tokens":0,"cached_tokens":0,"cache_write_tokens":0},"completion_tokens_details":{"audio_tokens":0,"image_tokens":0,"reasoning_tokens":303}},"content":"Hello! How can I assist you today?"}},"exampleRequest":{"messages":[{"role":"user","content":"Hello"}]},"tags":["x402"],"displayCostAmount":"0.006000","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.10","reviews":0,"stars":null,"state":"rated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.006000/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_xMwsqFMyLPNSu5PUBopNW","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calls Alibaba's Qwen3.5 large language model with 1M context window for multilingual text and coding tasks via pay-per-call x402 gateway","exampleAgentPrompt":"Use Qwen3.5 to write a Python function that parses ISO 8601 dates and explain how it handles edge cases — the context includes a 50,000-token codebase I've pasted in.","exampleUseCases":null,"resultDescription":"Returns the model-generated text completion, code, translation, or reasoning output from Alibaba's Qwen3.5 model, which supports up to 1 million tokens of context and excels at multilingual and software engineering tasks.","failureModes":["Payment not attached or insufficient USDC — 402 Payment Required","Prompt exceeds 1M token context limit — context length error","Model unavailable or gateway timeout — 503 or 504 error","Malformed request body — 400 Bad Request","Rate limit exceeded — 429 Too Many Requests"],"whenToPreferThis":"Choose this endpoint when you need a large-context LLM (up to 1M tokens), need strong multilingual capabilities (especially East Asian languages), or want Alibaba's Qwen model specifically as an alternative to OpenAI/Anthropic models. Useful for processing very long documents or codebases in a single call.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":10,"lastUsedAt":"2026-06-17T22:03:45.396Z","lastSuccessfullyRanAt":"2026-06-17T21:55:50.105Z","lastHealthCheckAt":"2026-10-27T06:37:11.702Z","isFirstParty":false,"canonicalSlug":"x402-gateway-production-up-railway-app-95f647a8"}