{"uid":"cap_nQYZNtth9PhF40lBDjkYl","slug":"singit-ask-deepseek-v4-1-flash-chat-completions-604c4592","name":"SingIt Ask: DeepSeek V4.1 Flash Chat Completions","description":"SingIt Ask: DeepSeek V4.1 Flash (DeepSeek) chat completions with no API key or account, OpenAI-compatible. DeepSeek's fast, lower-cost V4.1 model; also this service's own default model. Call it when an agent needs DeepSeek V4.1 Flash specifically.","url":"https://ask.singitai.app/v1/chat/deepseek-v4.1-flash?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":"$0.001678/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001678","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001678","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_iq_ld_ThUSdnC6SloMOB3","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001678","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs a chat conversation through DeepSeek V4.1 Flash via an OpenAI-compatible endpoint, with no API key required, paid per call via x402.","exampleAgentPrompt":"Ask DeepSeek V4.1 Flash to summarize the pros and cons of switching from REST to GraphQL, keeping the answer under 400 tokens — use the default model and no streaming.","exampleUseCases":[{"title":"Fast Q&A for a coding assistant","prompt":"Send this message to DeepSeek V4.1 Flash: 'Explain the difference between a mutex and a semaphore in plain English, with a short Python example.' Keep the reply under 600 tokens."},{"title":"Cost-efficient multi-turn conversation","prompt":"I have a 5-message conversation history where I'm asking DeepSeek V4.1 Flash to help me draft a product spec. Pass all 5 messages in order and let the model respond, capping output at 800 tokens."},{"title":"System-prompted classification task","prompt":"Use DeepSeek V4.1 Flash with a system prompt that says 'You are a sentiment classifier, respond with only POSITIVE, NEGATIVE, or NEUTRAL.' and a user message of 'The new update completely broke my workflow.' Give me the result in under 50 tokens."}],"resultDescription":"Returns an OpenAI-compatible chat completion JSON object containing the assistant's reply text, token usage counts (prompt, completion, total), and the model name used. Streaming is not supported; the full response is returned in one payload.","failureModes":["Messages exceed 24,000 characters total — request rejected","max_tokens set above 1,200 — request rejected","Payment not fulfilled via x402 — 402 Payment Required returned","Invalid message role (not system/user/assistant) — schema validation error","Upstream DeepSeek service unavailable — 5xx error propagated"],"whenToPreferThis":"Choose this endpoint when you specifically need DeepSeek V4.1 Flash (fast, low-cost inference) and want an OpenAI-compatible interface without managing API keys or accounts. It is ideal for agents that need pay-per-call pricing via x402 with no signup overhead. Prefer it over other SingIt Ask model endpoints when cost efficiency and DeepSeek's particular strengths (coding, reasoning, concise output) matter more than frontier-model capability.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T19:03:54.947Z","isFirstParty":false,"canonicalSlug":"singit-ask-deepseek-v4-1-flash-chat-completions-604c4592"}