{"uid":"cap_gubcF1qb4yrtg_0JWcUkF","slug":"singit-ask-deepseek-v4-pro-chat-completions-d1fdbe67","name":"SingIt Ask: DeepSeek V4 Pro Chat Completions","description":"SingIt Ask: DeepSeek V4 Pro (DeepSeek) chat completions with no API key or account, OpenAI-compatible. DeepSeek's larger V4 model: coding and reasoning tasks. Call it when an agent needs DeepSeek V4 Pro specifically.","url":"https://ask.singitai.app/v1/chat/deepseek-v4-pro?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","examples":["deepseek-v4.1-flash","claude-opus-5.5","gpt-5.5","gemini-3.1-pro"],"description":"Any model id from GET /v1/models; the ceiling follows its price. Omit for the default model."},"stream":{"enum":[false],"type":"boolean","description":"Streaming is not offered."},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"enum":["system","user","assistant"],"type":"string"},"content":{"type":"string","description":"Plain text; all messages together under 24000 characters."}}},"maxItems":40,"minItems":1,"description":"The conversation, oldest first."},"max_tokens":{"type":"integer","default":800,"maximum":1200,"minimum":1,"description":"The longest answer, in tokens. The payment ceiling grows with it; the charge follows what was used."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0015","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.0015/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0015","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0015","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_HyfAUw9z1QXoshnmI5-tR","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0015","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Proxies chat completions to DeepSeek's V4 Pro model (optimized for coding and reasoning) via an OpenAI-compatible API, requiring no API key or account, paid per-call with USDC.","exampleAgentPrompt":"Use DeepSeek V4 Pro to review this Python function and suggest optimizations — here's my conversation so far: [system: 'You are a senior software engineer', user: 'Here is my code: def fib(n): return fib(n-1)+fib(n-2)'] — keep the answer under 800 tokens.","exampleUseCases":[{"title":"Code review and optimization","prompt":"I need DeepSeek V4 Pro to review this recursive Fibonacci function and suggest a more efficient implementation — it's timing out on large inputs. Messages: system: 'You are an expert Python developer', user: 'Optimize this: def fib(n): if n<=1: return n; return fib(n-1)+fib(n-2)'. Cap the response at 1000 tokens."},{"title":"Complex multi-step reasoning problem","prompt":"Can you send this logic puzzle to DeepSeek V4 Pro and get a step-by-step solution? The puzzle is: 'Three switches control three lights in another room. You can only enter the room once. How do you determine which switch controls which light?' Keep the answer under 600 tokens."},{"title":"Technical documentation generation","prompt":"Have DeepSeek V4 Pro write a detailed README for my REST API project based on these notes — system: 'You are a technical writer', user: 'My project is a task manager API with endpoints for create, read, update, delete tasks, using JWT auth and PostgreSQL'. Limit to 1200 tokens."}],"resultDescription":"A JSON object in OpenAI chat completion format containing the assistant's generated message, usage statistics (prompt tokens, completion tokens, total tokens), model identifier, and finish reason. No streaming — the full response is returned at once.","failureModes":["Message content exceeds 24000 character limit — request rejected","max_tokens set above 1200 — validation error","Empty messages array or missing required role/content fields — schema validation error","Payment failure or insufficient USDC balance — 402 payment required response","Model id not found in /v1/models — model not available error","Rate limiting or upstream DeepSeek API unavailability — 503 or timeout"],"whenToPreferThis":"Choose this endpoint when you specifically need DeepSeek V4 Pro's stronger coding and reasoning capabilities over lighter models like DeepSeek V4.1 Flash, and when you want to avoid creating a DeepSeek account or managing API keys. Ideal for pay-per-call agent pipelines where you need a powerful reasoning model on demand. Prefer it over the Flash variant for complex multi-step problems, detailed code generation, or tasks where reasoning depth matters more than speed or cost.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:04:57.043Z","isFirstParty":false,"canonicalSlug":"singit-ask-deepseek-v4-pro-chat-completions-d1fdbe67"}