{"uid":"cap_DKwJLkrhVeNG64kK3Q0hn","slug":"deepseek-v4-flash-0731-x402engine-dde9025a","name":"DeepSeek V4 Flash 0731 (x402engine)","description":"DeepSeek's re-post-trained V4 Flash revision — substantially enhanced agentic capabilities, coding, and reasoning with 1M context","url":"https://x402engine.app/api/llm/deepseek-v4-flash-0731","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.003/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_0-VjLKWTvoJx453nAfjg9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs inference on DeepSeek's re-post-trained V4 Flash revision with enhanced agentic capabilities, coding, and reasoning over a 1M-token context window, billed per call via x402 micropayments.","exampleAgentPrompt":"Use the DeepSeek V4 Flash 0731 model to review this 50,000-line codebase I'm pasting and identify all potential security vulnerabilities, then suggest fixes — I need its enhanced reasoning and long context.","exampleUseCases":[{"title":"Long-context codebase security audit","prompt":"I have a massive monorepo I want to analyze for security issues — can you send the whole thing to DeepSeek V4 Flash 0731 and have it flag vulnerabilities and suggest patches? It's about 800K tokens worth of code."},{"title":"Multi-step agentic task planning","prompt":"I need to break down this complex product launch into a detailed execution plan with dependencies, owners, and timelines — use the DeepSeek V4 Flash agentic model to reason through it step by step and give me a structured output."},{"title":"Pay-per-call coding assistant","prompt":"Without setting up any subscriptions, just call the DeepSeek V4 Flash model and have it write me a Python service that scrapes job listings, deduplicates them, and posts them to a Slack webhook."}],"resultDescription":"Returns a generated text response from the DeepSeek V4 Flash 0731 model, which may include natural language output, code, structured reasoning, or agentic step-by-step plans. The response is billed at $0.003 USDC per call via the x402 micropayment protocol.","failureModes":["Payment failure if insufficient USDC balance for x402 micropayment (HTTP 402)","Context length exceeded if input exceeds 1M tokens","Rate limiting or throttling under high load","Malformed request body causing inference failure","Model unavailability or provider-side outage"],"whenToPreferThis":"Choose this endpoint when you need DeepSeek's enhanced V4 Flash reasoning and coding capabilities with a 1M token context window and want pay-per-call pricing with no subscription — especially useful for agentic workflows, long-context document analysis, or large codebase review without committing to a monthly plan.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:41:01.594Z","isFirstParty":false}