{"uid":"cap_eC0MEtO99WwdciXWvJR20","slug":"model-access-gateway-gpt-5-5-chat-completions-x402-eac47acc","name":"Model Access Gateway – GPT-5.5 Chat Completions (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://agent402-arb.rosariovitale0096.workers.dev/llm/gpt-5.5?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Optional: fixed by the route (openai/gpt-5.5)"},"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":"openai/gpt-5.5","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":"0.0014","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":"$0.0014/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0014","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0014","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_OypetssiHlE6JS9iHCyOG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0014","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sends a chat completion request to GPT-5.5 via an OpenAI-compatible API, billed per-request in USDC on Base using x402 — no account or API key required.","exampleAgentPrompt":"Ask GPT-5.5 to write me a concise executive summary of the following meeting transcript — pay for it per-request in USDC using the x402 gateway so I don't need to set up an OpenAI account.","exampleUseCases":[{"title":"Anonymous LLM call for agentic pipeline","prompt":"Send this support ticket text to GPT-5.5 and ask it to classify the issue category and urgency — pay per-call in USDC so our pipeline doesn't need a stored API key."},{"title":"One-off document drafting with crypto payment","prompt":"Have GPT-5.5 draft a short product description for our new wireless headphones — pay the per-request USDC fee automatically, I don't want to manage an OpenAI subscription."},{"title":"Serverless AI reasoning for a Web3 app","prompt":"I need you to call GPT-5.5 to reason through this on-chain transaction data and summarize what the wallet has been doing — use the x402 micropayment gateway so the dApp pays per inference with no backend credentials."}],"resultDescription":"Returns an OpenAI-compatible chat.completion JSON object containing the assistant's message content, token usage breakdown (prompt, completion, total), finish reason, model identifier, and a completion ID.","failureModes":["Insufficient USDC balance — x402 payment fails, request rejected with 402 Payment Required","Invalid or malformed message body — returns 400 with schema validation error","Model unavailable or overloaded — returns 503 or timeout","Network failure to the Cloudflare Worker — connection timeout or 5xx","Token limit exceeded for the selected model — returns 400 or truncated response"],"whenToPreferThis":"Choose this endpoint when you need GPT-5.5 chat completions without managing an OpenAI API key or subscription, and your agent or application can pay per-request in USDC via the x402 protocol on Base. Ideal for autonomous agents, Web3-native apps, or serverless pipelines where credential management is undesirable.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-15T12:33:38.421Z","isFirstParty":false,"canonicalSlug":"model-access-gateway-gpt-5-5-chat-completions-x402-eac47acc"}