{"uid":"cap_-_hOIGkrVlj-VhNx9sFg3","slug":"gpt-5-5-chat-completions-via-get-gpt55-558686-xyz-495925ea","name":"GPT-5.5 Chat Completions via GET (gpt55.558686.xyz)","description":"GPT-5.6 Luna API Base USDC and OpenAI-compatible x402 chat: one request for $0.00293, paid by browser wallet or a quote-first agent fallback.","url":"https://gpt55.558686.xyz/v1/chat/completions/gpt-5.5","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"pathParams":{"type":"object","additionalProperties":true},"queryParams":{"type":"object","properties":{"q":{"type":"string"},"input":{"type":"string"},"model":{"enum":["gpt-5.6-sol","gpt-5.6","gpt-5.6-luna","gpt-5.6-terra","gpt-5.5","gpt-5.3-codex","gpt-5.4"],"type":"string"},"prompt":{"type":"string"},"system":{"type":"string"},"message":{"type":"string"},"max_tokens":{"type":"integer","maximum":128000,"minimum":1},"system_prompt":{"type":"string"},"max_output_tokens":{"type":"integer","maximum":128000,"minimum":1}},"additionalProperties":true}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["id","object","model","choices"],"properties":{"id":{"type":"string"},"model":{"type":"string"},"usage":{"type":"object"},"object":{"type":"string"},"choices":{"type":"array"}},"additionalProperties":true}}}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl_example","model":"gpt-5.6-luna","usage":{"total_tokens":44,"prompt_tokens":32,"completion_tokens":12},"object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"A concise answer from GPT-5.5."},"finish_reason":"stop"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.019999","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":"$0.019999/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.019999","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.019999","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_uR0zX_Cl6m0Ig8z6muDFN","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.019999","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Generates GPT-5.5 chat completions via a GET request with query parameters, optimized for strong reasoning, production work, code, and structured responses, paid via x402 USDC on Base.","exampleAgentPrompt":"Ask GPT-5.5 to review this Python function and suggest production-ready improvements, keeping the response under 500 tokens: 'def fetch_user(id): return db.query(User).filter(User.id == id).first()'","exampleUseCases":null,"resultDescription":"Returns an OpenAI-compatible chat completion object with an id, model name, choices array containing the generated text, and usage statistics including input/output token counts.","failureModes":["Missing required 'input' query parameter returns a 400 error","Prompt exceeds 700,000 character limit causing rejection","max_tokens exceeds 2048 ceiling causing validation error","Insufficient USDC balance or invalid x402 payment header causes 402 Payment Required","Invalid model enum value causes a schema validation error","Rate limiting or upstream GPT-5.5 unavailability returns a 503 error"],"whenToPreferThis":"Prefer this endpoint when you need strong reasoning, code generation, or structured output from GPT-5.5 via a simple GET request with query parameters, and are willing to pay up to $0.091 USDC per call via x402 on Base. Choose this over cheaper sibling endpoints when task complexity demands the full GPT-5.5 model tier rather than mini or codex variants.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:50:06.336Z","isFirstParty":false}