{"uid":"cap_fu_AOivXC3U8-6dMEIIEI","slug":"telnyx-x402-gateway-deepseek-v4-flash-0731-chat-completions-e659d608","name":"Telnyx x402 Gateway – DeepSeek-V4-Flash-0731 Chat Completions","description":"Pay USDC per request for Telnyx Inference and Audio (text-to-speech, speech-to-text) through x402.","url":"https://x402.telnyx.com/v1/chat/completions/_t/deepseek-v4-flash-0731?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"n":{"type":"integer","const":1,"description":"Fixed to one completion per paid call."},"model":{"type":"string","const":"deepseek-ai/DeepSeek-V4-Flash-0731","description":"Model identifier; fixed to deepseek-ai/DeepSeek-V4-Flash-0731 on this route."},"tools":{"type":"array","items":{"type":"object"},"maxItems":16},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"enum":["system","user","assistant","tool"],"type":"string"},"content":{"type":"string","maxLength":32000}}},"maxItems":32,"description":"OpenAI-style chat messages."},"max_tokens":{"type":"integer","maximum":2048,"minimum":1},"temperature":{"type":"number","maximum":2,"minimum":0}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-xxx","usage":{"total_tokens":16,"prompt_tokens":12,"completion_tokens":4},"object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"Hello!"},"finish_reason":"stop"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005214","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":"$0.005214/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005214","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005214","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_86rlJWLvjNWMvWMNn_zXi","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005214","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Generates chat completions using the DeepSeek-V4-Flash-0731 model via Telnyx's x402 pay-per-request USDC gateway","exampleAgentPrompt":"Send a chat message to the DeepSeek V4 Flash model through Telnyx and get a completion back — my messages are: system: 'You are a helpful assistant', user: 'Explain quantum entanglement in two sentences', with a max of 300 tokens and temperature 0.7.","exampleUseCases":[{"title":"On-demand AI coding assistant","prompt":"I want to query the DeepSeek Flash model to help me debug this Python function — send it the system message 'You are an expert Python developer' and user message 'Why does this code raise a KeyError: for k in d: del d[k]', with up to 512 tokens and temperature 0.2."},{"title":"Pay-per-call chatbot prototype","prompt":"Without signing up for a monthly plan, use the Telnyx DeepSeek V4 Flash endpoint to answer a customer's question — system: 'You are a friendly customer support agent', user: 'How do I reset my password?', temperature 1.0, max 256 tokens."},{"title":"Agentic tool-use inference","prompt":"Call the DeepSeek V4 Flash model on Telnyx with these tools defined for weather lookup and calendar access, and pass this user message: 'What meetings do I have tomorrow and what's the weather in New York?' — use temperature 0.5 and up to 1024 tokens."}],"resultDescription":"Returns an OpenAI-compatible chat completion JSON object including a unique completion ID, the assistant's reply message, finish reason (e.g. 'stop'), and token usage breakdown (prompt tokens, completion tokens, total tokens).","failureModes":["Payment rejected or insufficient USDC balance — x402 payment header validation fails","Messages array exceeds 32 items or content exceeds 32,000 characters — 400 validation error","max_tokens out of range (must be 1–2048) — 422 unprocessable entity","temperature out of range (must be 0–2) — 422 validation error","Tools array exceeds 16 items — schema validation failure","Model unavailable or Telnyx inference backend down — 503 service unavailable","Malformed JSON body — 400 bad request"],"whenToPreferThis":"Choose this endpoint when you need pay-per-call LLM inference with no subscription or API key setup, settling in USDC via x402 micropayment protocol. It is ideal for agents that need cost-controlled, on-demand access to the DeepSeek-V4-Flash-0731 model specifically, with OpenAI-compatible request/response format and tool-calling support up to 16 tools.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-12T06:42:41.766Z","isFirstParty":false,"canonicalSlug":"telnyx-x402-gateway-deepseek-v4-flash-0731-chat-completions-e659d608"}