{"uid":"cap_opsMVvCOxatv6lWyJvEci","slug":"low-price-gpt-5-5-x402-api-gateway-max-output-chat-completions-1bd30af9","name":"Low-Price GPT-5.5 x402 API Gateway – Max Output Chat Completions","description":"GET quote and query-parameter variant for the true max-output OpenAI-compatible GPT-5.5 chat completion endpoint. Use this for directory health checks, wallets, and simple agent clients that validate x402 payment requirements before issuing a paid call. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call, while this gateway advertises a $0.110876 compact GPT-5.5 entry request, $0.110876 long-output GPT-5.5 requests, and $0.523889 true max-output GPT-5.5 requests. Pay up to $0.523889 per request with x402 USDC on Base. Exact fixed-price payment and upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Public paid calls are limited to 700000 input characters and 128000 output tokens.","url":"https://gpt55.558686.xyz/v1/chat/completions/max?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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"],"type":"string"},"queryParams":{"type":"object","properties":{"q":{"type":"string"},"input":{"type":"string"},"model":{"enum":["gpt-5.5","gpt-5.4-mini"],"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":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.523889","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.523889/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.523889","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.523889","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_M2e_YV0pKVtk6n30b_Jpg","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.523889","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs a GPT-5.5 chat completion request via x402 USDC micropayment on Base, supporting up to 128,000 output tokens per call at $0.066667","exampleAgentPrompt":"Ask GPT-5.5 to write a detailed 3,000-word blog post about the future of decentralized AI — use a system prompt that says 'You are a tech journalist' and allow up to 4000 output tokens.","exampleUseCases":null,"resultDescription":"Returns an OpenAI-compatible JSON chat completion object containing the assistant's message content, finish reason, token usage (prompt, completion, total), completion ID, and model name (gpt-5.5). The choices array holds the generated text under choices[0].message.content.","failureModes":["Payment not received or x402 USDC transaction on Base fails — returns 402 Payment Required","Invalid or missing input query parameters — returns 400 Bad Request","Model overload or upstream OpenAI rate limit — returns 503 or 429","max_output_tokens exceeds 128000 — rejected by schema validation","Network timeout on long high-token completions — returns 504 Gateway Timeout","Malformed JSON response if upstream provider is degraded"],"whenToPreferThis":"Choose this endpoint when you need GPT-5.5 completions with large output (up to 128k tokens) and want to pay per-call in USDC via x402 on Base without a subscription. Prefer over the compact variant when response length is expected to be substantial. Use when an OpenAI-compatible response schema is required and crypto micropayment is acceptable or preferred.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T00:39:39.615Z","isFirstParty":false,"canonicalSlug":"low-price-gpt-5-5-x402-api-gateway-max-output-chat-completions-1bd30af9"}