{"uid":"cap_Zj3fql9dArYi2cGZXCuW2","slug":"model-access-gateway-deepseek-v4-1-flash-via-x402-f9018b6e","name":"Model Access Gateway – DeepSeek V4.1 Flash via x402","description":"LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.","url":"https://modelaccessgateway.com/llm/deepseek-v4.1-flash?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Optional: fixed by the route (deepseek/deepseek-v4.1-flash)"},"tools":{"type":"array"},"stream":{"type":"boolean","description":"true: server-sent events after payment"},"messages":{"type":"array","items":{"type":"object","required":["role"],"properties":{"role":{"enum":["system","user","assistant","tool","developer"],"type":"string"},"content":{"type":["string","array","null"]}}},"minItems":1},"max_tokens":{"type":"integer","maximum":16384,"minimum":1,"description":"Optional, default 4096"},"temperature":{"type":"number","maximum":2,"minimum":0},"response_format":{"type":"object"}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-7f3c2a91","model":"deepseek/deepseek-v4.1-flash","usage":{"total_tokens":10,"prompt_tokens":9,"completion_tokens":1},"object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"OK"},"finish_reason":"stop"}],"created":1791979200}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2TRjNtngSS64QjfGQakcx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"OpenAI-compatible chat completions using DeepSeek V4.1 Flash, paid per-call in USDC on Base via x402 with no API key required","exampleAgentPrompt":"Ask DeepSeek V4.1 Flash to summarize the following text in three bullet points, paying per call with USDC — no API key: 'Artificial intelligence is transforming industries by automating repetitive tasks, enhancing decision-making, and enabling new product categories that were previously impossible.'","exampleUseCases":[{"title":"Autonomous agent LLM reasoning step","prompt":"I need my agent to call DeepSeek V4.1 Flash to reason through a multi-step problem — pay per call in USDC so there's no subscription or API key to manage. Send it the system prompt 'You are a helpful reasoning assistant' and user message 'What are the pros and cons of using a microservices architecture?' with max 2048 tokens."},{"title":"No-account content generation for a script","prompt":"Generate a short product description for a noise-cancelling headphone using DeepSeek V4.1 Flash — I don't want to sign up for anything, just pay per request in USDC. Keep it under 200 tokens and temperature at 0.7."},{"title":"Structured JSON extraction from raw text","prompt":"Use DeepSeek V4.1 Flash to extract the company name, founding year, and CEO from this paragraph and return the result as JSON: 'Acme Corp was founded in 1998 by Jane Doe, who continues to serve as CEO.' Set response_format to JSON mode and max_tokens to 256."}],"resultDescription":"A standard OpenAI-compatible chat.completion JSON object containing the assistant's generated message, finish reason (e.g. 'stop'), token usage counts (prompt, completion, total), model identifier, and a unique completion ID. Streaming mode returns server-sent events instead.","failureModes":["Payment failure or insufficient USDC balance — x402 payment rejected, no completion returned but automatic refund issued","Model error or timeout — service returns error and triggers automatic refund","Invalid messages array (empty or missing role) — 400 validation error","max_tokens out of range (>16384 or <1) — 400 validation error","Temperature out of range (>2 or <0) — 400 validation error","Network timeout during streaming — partial SSE stream may be lost"],"whenToPreferThis":"Choose this endpoint when you need DeepSeek V4.1 Flash inference with zero account setup — ideal for AI agents that pay per call in USDC via the x402 protocol on Base. Prefer it over managed LLM APIs (OpenAI, Anthropic direct) when you want no subscription commitment, automatic refunds on failure, and a fully OpenAI-compatible interface that works with existing tooling. Best for agentic workflows, scripts, or pipelines that need on-demand, trustless LLM access with crypto-native payment rails.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:35:11.124Z","isFirstParty":false,"canonicalSlug":"model-access-gateway-deepseek-v4-1-flash-via-x402-f9018b6e"}