{"uid":"cap_rax6OjMbGrGRamSCBxVwn","slug":"redbtc-gpt-5-4-mini-chat-fixed-price-2578d3aa","name":"RedBTC GPT-5.4-mini Chat (Fixed-Price)","description":"Cheapest RedBTC agent chat route. Fixed gpt-5.4-mini, no API key, USDC per call, hard capped for safe autonomous use.","url":"https://redbtco.com/x402/redbtc/chat/5.4-mini?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Optional. RedBTC forces gpt-5.6-luna on this fixed-price route."},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"enum":["system","user","assistant","tool"],"type":"string"},"content":{"type":"string"}}},"minItems":1},"max_tokens":{"type":"integer","maximum":600,"minimum":1},"temperature":{"type":"number","maximum":2,"minimum":0}}},"responseSchema":null,"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_feXKYNmWyfjC_D4YOY-ku","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":"Sends a chat message to a fixed gpt-5.4-mini model via a pay-per-call USDC route with no API key required, capped at 600 tokens for safe autonomous agent use.","exampleAgentPrompt":"Use the RedBTC gpt-5.4-mini chat route to answer the following in under 200 tokens: 'What are three tips for writing clean Python code?'","exampleUseCases":[{"title":"Autonomous agent quick Q&A","prompt":"Ask the RedBTC gpt-5.4-mini model — with a 150-token limit — 'What is the capital of France and why is it historically significant?'"},{"title":"Low-cost content summarization","prompt":"Use the cheapest RedBTC chat route to summarize this paragraph in 100 tokens or fewer: 'Photosynthesis is the process by which green plants convert sunlight into chemical energy stored as glucose.'"},{"title":"Agent pipeline decision step","prompt":"Call the RedBTC gpt-5.4-mini chat endpoint and ask it, with temperature 0: 'Given the following list of tasks, which should I prioritize first: send invoice, schedule meeting, or reply to client?' Keep the reply under 80 tokens."}],"resultDescription":"A text completion from the gpt-5.4-mini model, returned as an assistant message. The response is capped at a maximum of 600 tokens and is billed at $0.001 USDC per call via the x402 payment protocol.","failureModes":["Payment failure if USDC balance is insufficient for the $0.001 per-call fee","Request rejected if messages array is empty or missing required role/content fields","Response truncated if max_tokens is set very low relative to prompt complexity","Rate limiting or hard cap enforcement if token ceiling is exceeded","Unpredictable output if temperature is set to extreme values (0 or 2)"],"whenToPreferThis":"Choose this endpoint when you need the lowest-cost AI chat completions without managing an OpenAI API key, especially in autonomous agent pipelines where per-call USDC billing and a hard 600-token cap provide cost safety. Prefer it over the sibling gpt-5.5 route when response quality requirements are moderate and minimizing spend is the priority.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T19:27:51.255Z","isFirstParty":false,"canonicalSlug":"redbtc-gpt-5-4-mini-chat-fixed-price-2578d3aa"}