{"uid":"cap_Qjhzwubb4taBn1AvtXk_Z","slug":"deepseek-v4-flash-chat-completions-via-x402-x402donghang-aafdfccb","name":"DeepSeek V4 Flash Chat Completions via x402 (x402donghang)","description":"Fresh crypto narrative research with market context and verifiable source URLs. Free BTC sample; custom radar $0.02/call via x402 USDC.","url":"https://x402donghang.duckdns.org/x402/v1/models/deepseek-v4-flash/chat/completions?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Use \"deepseek-v4-flash\""},"stream":{"type":"boolean"},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"type":"string"},"content":{"type":"string"}}}},"max_tokens":{"type":"number"}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-x402","model":"deepseek-v4-flash","object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"Hello!"},"finish_reason":"stop"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_9lIczZBQVmt6CF5Po54TK","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs a DeepSeek V4 Flash chat completion request via an OpenAI-compatible API, billed at $0.003 USDC per call using the x402 payment protocol — no signup required.","exampleAgentPrompt":"Ask DeepSeek V4 Flash to explain the difference between proof-of-work and proof-of-stake in simple terms — keep the response under 300 tokens.","exampleUseCases":[{"title":"Pay-per-call agent reasoning step","prompt":"Use the cheap DeepSeek V4 Flash model to answer this reasoning question for me: 'A train leaves Chicago at 60 mph and another leaves New York at 80 mph — when do they meet?' Keep it under 200 tokens."},{"title":"No-signup LLM for quick prototyping","prompt":"I don't want to create an API account anywhere — just run this prompt through DeepSeek V4 Flash and return the reply: 'List five creative names for a productivity app aimed at developers.'"},{"title":"AI agent pipeline inference on a budget","prompt":"My agent needs to classify this user message as either a complaint, a question, or a compliment, and explain why — run it through DeepSeek V4 Flash: 'Why does your app keep crashing every morning?'"}],"resultDescription":"Returns a standard OpenAI-compatible chat completion JSON object containing an 'id', 'model' (deepseek-v4-flash), 'object' (chat.completion), and a 'choices' array with the assistant's reply message, its role, content string, and a 'finish_reason' field (e.g. 'stop').","failureModes":["Payment not included or insufficient USDC — returns HTTP 402 with payment instructions","Invalid or missing 'messages' array — returns 400 validation error","Model field not set to 'deepseek-v4-flash' — may return 404 or model-not-found error","Upstream DeepSeek service unavailable — returns 502 or 503","max_tokens too large for model context — may truncate or return error","Network timeout if streaming is enabled but client disconnects early"],"whenToPreferThis":"Choose this endpoint when you need a low-cost ($0.003/call), no-signup, pay-as-you-go LLM for chat completions that is OpenAI-compatible and settles instantly via USDC on x402. It is ideal for AI agents that need to avoid subscription lock-in, prototype quickly with crypto micropayments, or embed inference steps inside automated pipelines without credential management overhead. Prefer alternatives if you need GPT-4-class reasoning, image inputs, or function calling.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T06:29:07.153Z","isFirstParty":false,"canonicalSlug":"deepseek-v4-flash-chat-completions-via-x402-x402donghang-aafdfccb"}